CN102237851A - Oscillation signal generation device and related method thereof - Google Patents
Oscillation signal generation device and related method thereof Download PDFInfo
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- CN102237851A CN102237851A CN2010101513618A CN201010151361A CN102237851A CN 102237851 A CN102237851 A CN 102237851A CN 2010101513618 A CN2010101513618 A CN 2010101513618A CN 201010151361 A CN201010151361 A CN 201010151361A CN 102237851 A CN102237851 A CN 102237851A
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Abstract
The invention relates to an oscillation signal generation device and a related oscillation signal generation method thereof. The oscillation signal generation device comprises an oscillation circuit and a control circuit, wherein the control circuit is coupled to a crystal oscillator, and is used for generating a control signal to switch the enabling state of an oscillation starter in the oscillation circuit into a disabling state and taking an oscillation signal generated by the crystal oscillator in the oscillation circuit as an output oscillation signal of the oscillation circuit when the oscillation circuit is in an operating mode to generate the output oscillation signal. The oscillation signal generation device switches the oscillation circuit off after the oscillation of the oscillation circuit is successfully started to save the power consumption of the oscillation circuit, restarts the oscillation circuit when the energy of a resonance signal generated by the crystal oscillator as the output oscillation signal of the oscillation circuit is reduced to a preset degree so as to fulfill the aim of reducing the power consumption, and occupies a relatively smaller chip area.
Description
Technical field
The present invention relates to the crystal oscillator correlative technology field, more particularly, relate to a kind of oscillation signal generation device and its correlation technique of low power consumption.
Background technology
In numerous clock generators, the reference clock that produces can have frequency of oscillation the most accurately to a crystal oscillator (also claiming quartz (controlled) oscillator (CrystalOscillator)), so crystal oscillator is widely used in the most electronic installation.Yet in order to increase the stand-by time of electronic installation, this Design of Crystal Oscillator develops towards the direction of low transduction (gm), low current gradually.So but cause the area of this crystal oscillator to increase significantly, and then make this crystal oscillator trend towards than unsure state.Furthermore, when this crystal oscillator had the circuit characteristic of low transduction and low current, the shortcoming of not starting of oscillation of circuit just may take place during in higher temperatures or than low supply voltage in this crystal oscillator.Because running clock that this crystal oscillator produces is a clock source of all different frequency clocks in this electronic installation, therefore the saving current design that traditional crystal oscillator adopted is in some special situation, as high temperature or low pressure, will cause this electronic installation the situation of machine to occur working as.Therefore, the power consumption that how to reduce this crystal oscillator to be prolonging the service time of this electronic installation, and the stability that increases this crystal oscillator has simultaneously become a field person for this reason to need the problem of solution badly.
Summary of the invention
The technical problem to be solved in the present invention is, at the above-mentioned defective of prior art, provides a kind of oscillation signal generation device and its correlation technique of low power consumption.
One of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of oscillation signal generation device, this oscillation signal generation device includes an oscillating circuit and a control circuit.This oscillating circuit includes: a crystal oscillator has one first end points and one second end points, is used for producing an oscillation signal; One resistive element has this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And one the starting of oscillation utensil have an input endpoint to be coupled to this first end points of this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator.This control circuit is coupled to this crystal oscillator, when this oscillating circuit is in an operating mode to produce an output during oscillation signal, this control circuit produces a controlling signal and this vibration generator is switched to one from an activation state press down can state, and comes this output oscillation signal as this oscillating circuit according to this oscillation signal that this crystal oscillator produced.
Oscillation signal generation device of the present invention, wherein this vibration generator operates between one first supply voltage and the one second supply voltage, and press down can state the time when this vibration generator is in this, be in (open-circuit) state that opens circuit between this vibration generator and this first voltage quasi position or this second voltage quasi position.
Oscillation signal generation device of the present invention, this resistive element one transmission lock wherein, when this vibration generator is in should press down the energy state time, this transmission lock is in a not on-state, and when this vibration generator was in this enabled status, this transmission lock was in a conducting state.
Oscillation signal generation device of the present invention, wherein this transmission lock is controlled by this control circuit.
Oscillation signal generation device of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, this one scheduled time of control circuit timing, and arrive back in this scheduled time and set this controlling signal and this vibration generator is switched to from this enabled status should press down the energy state.
Oscillation signal generation device of the present invention, wherein be in this and press down can state the time when this oscillating circuit is in this operating mode and this vibration generator, this control circuit is one scheduled time of timing in addition, and in this this controlling signal of scheduled time arrival back setting this vibration generator is pressed down and can switch to this enabled status by state from this.
Oscillation signal generation device of the present invention, wherein this control circuit includes:
One clock counter is used for counting the periodicity of this output oscillation signal to produce a count results; And
One decision circuitry, be coupled to this clock counter, be used for when this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period and counts, this decision circuitry produce this controlling signal with this vibration generator from the state of this activation switch to this press down can state.
Oscillation signal generation device of the present invention, wherein this decision circuitry in addition is in this operating mode and this vibration generator in this oscillating circuit and is in should press down the energy state time, judge whether this count results reaches one second predetermined period number, when this count results reached this second predetermined period and counts, this decision circuitry was set this controlling signal in addition this vibration generator is pressed down and can switch to this enabled status by state from this.
Oscillation signal generation device of the present invention, wherein this control circuit includes:
One peak is to peak (peak-to-peak) circuit for detecting, when this oscillating circuit is under this operating mode and this vibration generator when being in this enabled status, a peak of this output oscillation signal is detected to peak value to the peak circuit for detecting in this peak, and when peak value being reached one first critical peak to peak value in this peak, this peak to the peak circuit for detecting set this controlling signal this vibration generator is switched to from this enabled status that this presses down can state.
Oscillation signal generation device of the present invention, wherein be under this operating mode and this vibration generator is in this and presses down can state the time when this oscillating circuit, when this peak in addition reaches one second critical peak to peak value in this peak to peak value to the peak circuit for detecting, set this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
Oscillation signal generation device of the present invention, wherein this control circuit includes:
One first numerical digit frequency eliminator is coupled to this crystal oscillator, is used for this output oscillation signal is carried out the computing of signal frequency elimination, to produce one first frequency elimination oscillation signal;
One second numerical digit frequency eliminator is coupled to this first numerical digit frequency eliminator, is used for this first frequency elimination oscillation signal is carried out the computing of signal frequency elimination, to produce one second frequency elimination oscillation signal; And
One logic lock is coupled to this first digital frequency eliminator and this second digital frequency eliminator, is used for setting this controlling signal according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal.
Oscillation signal generation device of the present invention, wherein this controlling signal includes one first controlling signal and one second controlling signal, and this vibration generator includes:
One first switch has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first controlling signal;
One the first transistor has one second end points that a control point end is coupled to this first switch;
One second switch has this control end points that one first end points is coupled to this first transistor, and one second end points is coupled to one first supply voltage, and a control end points is coupled to this second controlling signal;
One first resistance has one first exit point that one first end points is coupled to this first transistor, and one second end points is coupled to this first supply voltage;
One the 3rd switch has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first controlling signal;
One transistor seconds has one second end points that a control point end is coupled to the 3rd switch;
One the 4th switch has this control end points that one first end points is coupled to this transistor seconds, and one second end points is coupled to one second supply voltage, and a control end points is coupled to this second controlling signal;
One second resistance has one first exit point that one first end points is coupled to this transistor seconds; And
One the 5th switch has one second end points that one first end points is coupled to this second resistance, and one second end points is coupled to this second supply voltage, and a control end points is coupled to this first controlling signal;
Wherein one second exit point of this first transistor is coupled to one second exit point of this transistor seconds, and is coupled to this second end points of this crystal oscillator.
Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of oscillation signal production method.This oscillation signal production method is used for controlling an oscillating circuit, and this oscillating circuit includes: a crystal oscillator has one first end points and one second end points, is used for producing an oscillation signal; One resistive element has this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And one the starting of oscillation utensil have an input endpoint to be coupled to this first end points of this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator.This oscillation signal production method includes: be in an operating mode to produce an output during oscillation signal in this oscillating circuit, produce a controlling signal and this vibration generator is switched to one from an activation state press down can state; And according to next this output oscillation signal of this oscillation signal that this crystal oscillator produced as this oscillating circuit.
Oscillation signal production method of the present invention, wherein this vibration generator operates between one first supply voltage and the one second supply voltage, and produces this controlling signal and this vibration generator is switched to this step that presses down the energy state from this enabled status include in addition:
With the path setting between this vibration generator and this first voltage quasi position or this second voltage quasi position is (open-circuit) state that opens circuit.
Oscillation signal production method of the present invention, this resistive element one transmission lock wherein, and produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include in addition:
Press down can state the time when this vibration generator is in this, should transmit lock and be set at a not on-state; And
When this vibration generator is in this enabled status, should transmits lock and be set at a conducting state.
Oscillation signal production method of the present invention, wherein when this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
One scheduled time of timing; And
In this this controlling signal of scheduled time arrival back setting this vibration generator is switched to this from this enabled status and press down the energy state.
Oscillation signal production method of the present invention wherein is in this and presses down can state the time when this oscillating circuit is in this operating mode and this vibration generator, and other includes:
One scheduled time of timing; And
Arriving this controlling signal of back setting in this scheduled time presses down this vibration generator can switch to this enabled status by state from this.
Oscillation signal production method of the present invention, wherein produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
The periodicity of counting this output oscillation signal is to produce a count results; And
When this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period and counts, produce this controlling signal with this vibration generator from the state of this activation switch to this press down can state.
Oscillation signal production method of the present invention wherein is in this and presses down can state the time when this oscillating circuit is in this operating mode and this vibration generator, produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include in addition:
Judge whether this count results reaches one second predetermined period number, when this count results reaches this second predetermined period and counts, set this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
Oscillation signal production method of the present invention, wherein produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
When this oscillating circuit is under this operating mode and this vibration generator when being in this enabled status, a peak of detecting this output oscillation signal is to peak value; And
When this peak reaches one first critical peak to peak value to peak value, set this controlling signal this vibration generator is switched to from this enabled status that this presses down can state.
Oscillation signal production method of the present invention wherein is under this operating mode and this vibration generator is in this and presses down can state the time when this oscillating circuit, produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include in addition:
When this peak reaches one second critical peak to peak value to peak value, set this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
Oscillation signal production method of the present invention, wherein produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
This output oscillation signal is carried out the computing of signal frequency elimination to produce one first frequency elimination oscillation signal;
This first frequency elimination oscillation signal is carried out the computing of signal frequency elimination to produce one second frequency elimination oscillation signal; And
Set this controlling signal according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal.
Oscillation signal production method of the present invention wherein is in this and presses down can state the time when this oscillating circuit is in this operating mode and this vibration generator, and other includes:
Detect this oscillation signal;
When detecting this oscillation signal when meeting a particular condition, then produce this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
Oscillation signal production method of the present invention, wherein this particular condition periodicity of fixing position or this oscillation signal in advance for the voltage conforms one of this oscillation signal is accumulate to a predetermined number.
Implement oscillation signal generation device of the present invention and its correlation technique, have following beneficial effect: the oscillation signal generation device is closed oscillating circuit to save the power consumption of oscillating circuit after oscillating circuit success starting of oscillation again, and a resonance signal that utilizes crystal oscillator to produce is exported oscillation signal as it, when the energy of this resonance signal that crystal oscillator produced is reduced to a predetermined extent, again start oscillating circuit, so reach the purpose that reduces power consumption.Compared to traditional crystal oscillator, oscillation signal generation device of the present invention does not need to see through low transduction and saves electric current with the method for designing of low current, and then also the crystal oscillator than traditional is little to make the occupied chip area of oscillation signal generation device of the present invention.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
One embodiment schematic diagram of a kind of oscillation signal generation device of Fig. 1 a the present invention;
The schematic diagram of another embodiment of Fig. 1 b oscillation signal generation device of the present invention;
Fig. 2 is in one and presses down can state the time one sequential chart of the resonance signal that one crystal oscillator is produced when the oscillating circuit in this oscillation signal generation device is in an operating mode and an inverter;
One first embodiment schematic diagram of Fig. 3 the present invention one control circuit;
Fig. 4 presses down when switching between can state a sequential chart of the electric current of flow through a first transistor and a transistor seconds when this inverter in this oscillation signal generation device in an activation state and;
One second embodiment schematic diagram of Fig. 5 the present invention one control circuit;
One sequential chart of one first frequency elimination oscillation signal of this control circuit of Fig. 6 Fig. 5, one second frequency elimination oscillation signal, one first controlling signal and one second controlling signal;
One embodiment flow chart of a kind of oscillation signal production method of Fig. 7 the present invention.
[primary clustering symbol description]
100 oscillation signal generation devices, 102 oscillating circuits, 104,500 control circuits, 402,404 curves, 502 first numerical digit frequency eliminators, 504 second numerical digit frequency eliminators, 506 logic locks, 1022 crystal oscillators, 1024 resistive elements, 1026 inverters, 1026a first switch, 1026b the first transistor, the 1026c second switch, 1026d first resistance, 1026e the 3rd switch, the 1026f transistor seconds, 1026g the 4th switch, 1026h second resistance, 1026i the 5th switch, 1028 amplifiers, 1028a the 6th switch, the 1028b minion is closed, the 1028c octavo is closed, 1042 clock counters, 1044 decision circuitry, 5062 NOR gate, 5064 inverters.
Embodiment
In the middle of specification and follow-up claim, used some vocabulary to censure specific assembly.The person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and follow-up claim are not used as distinguishing the mode of assembly with the difference of title, but the criterion that is used as distinguishing with the difference of assembly on function.Be an open term mentioned " comprising " in the middle of specification and the follow-up request item in the whole text, so should be construed to " comprise but be not limited to ".In addition, " couple " speech and comprise any indirect means that are electrically connected that directly reach at this, therefore, be coupled to one second device if describe one first device in the literary composition, then represent this first device can directly be electrically connected in this second device, perhaps see through other device or connection means and be electrically connected to this second device indirectly.
Please refer to Fig. 1 a.Shown in Fig. 1 a according to an embodiment schematic diagram of a kind of oscillation signal generation device 100 of the present invention.Oscillation signal generation device 100 includes an oscillating circuit 102 and a control circuit 104.Oscillating circuit 102 includes: a crystal oscillator 1022, and it has one first end points N1 and one second end points N2, is used for producing an oscillation signal Sosc; One resistive element 1024, it has the first end points N1 that one first end points is coupled to crystal oscillator 1022, and one second end points is coupled to the second end points N2 of crystal oscillator 1022; And an inverter 1026, it has the first end points N1 that an input endpoint is coupled to crystal oscillator 1022, and an exit point is coupled to the second end points N2 of crystal oscillator 1022.Control circuit 104 is coupled to crystal oscillator 1022, be used for being in an operating mode when producing an output oscillation signal Sout in oscillating circuit 102, produce a controlling signal EN, ENB and inverter 1026 is switched to one from an activation (enable) state press down can (disable) state, and come output oscillation signal Sout as oscillating circuit 102 according to the oscillation signal Sosc that crystal oscillator 1022 is produced.
Please note, the inverter 1026 of present embodiment operates between a supply voltage Vdd and the earthed voltage Vgnd, when oscillating circuit 102 is activated, that is supply voltage Vdd and earthed voltage Vgnd all normally connect when the power end of inverter 1026 and earth terminal, inverter 1026 can constitute a regenerative circuit with resistive element 1024 and crystal oscillator 1022, wherein inverter 1026 is used to provide this feedback circuit one transduction gain, and crystal oscillator 1022 can provide an enough phase delay, makes this loop satisfy Barkhausen (Barkhausen) law.In another embodiment, inverter 1026 can be an amplifier.Then, when the oscillating circuit 102 that is constituted when crystal oscillator 1022, resistive element 1024 and inverter 1026 is set to satisfy so-called Barkhausen (Barkhausen) law, oscillating circuit 102 will starting of oscillation also produce output oscillation signal Sout, wherein exporting oscillation signal Sout is to vibrate between supply voltage Vdd and earthed voltage Vgnd, and have an oscillation frequency specific, as 32kHz (frequency of oscillation is mainly decided according to the component characteristic of crystal oscillator 1022).And after oscillating circuit 102 has oscillation signal Sout, will store certain energy in the crystal oscillator 1022, this is because the main body of crystal oscillator 1022 is made of the big inductance of an equivalence, the electric capacity of an equivalence and the dead resistance of an equivalence.When the Q factor (that is Q value) of crystal oscillator 1022 was high more, its equivalent parasitic resistance values will be more little, and the energy that are stored in the crystal oscillator 1022 are just fewer by the energy that dead resistance consumes.That is to say when the mass parameter (that is Q value) of crystal oscillator 1022 is high more, do not having under the external power supply supply, this covibration that 1022 in crystal oscillator can be kept is just of a specified duration more.Therefore, one of spirit of the present invention is exactly when oscillating circuit 102 is in this operating mode and produce output oscillation signal Sout, produce controlling signal EN, ENB and inverter 102 is switched to from this enabled status should press down can state, and the next output oscillation signal Sout as oscillating circuit 102 of a resonance signal (that is oscillation signal Sosc) that is produced according to crystal oscillator 1022.Just can save inverter 102 institute's consumed current under this operating mode thus.
In order to further specify spiritual place of the present invention, in Fig. 1 a, also show an embodiment schematic diagram of inverter 1026 of the present invention, yet this embodiment is not as restriction of the present invention place.The inverter 1026 of present embodiment includes one first switch 1026a, a first transistor 1026b, a second switch 1026c, one first resistance 1026d, one the 3rd switch 1026e, a transistor seconds 1026f, one the 4th switch 1026g, one second resistance 1026h and one the 5th switch 1026i.The first switch 1026a has the first end points N1 that one first end points is coupled to crystal oscillator 1022, and a control end points is coupled to one first controlling signal EN.The first transistor 1026b has the one second end points N3 that a control point end N3 is coupled to the first switch 1026a.Second switch 1026c has the control end points N3 that one first end points is coupled to the first transistor 1026b, and one second end points is coupled to one first supply voltage (that is an earthed voltage Vgnd), and a control end points is coupled to one second controlling signal ENB.The first resistance 1026d has one first exit point (that is source terminal) that one first end points N4 is coupled to the first transistor 1026b, and one second end points is coupled to earthed voltage.The 3rd switch 1026e has the first end points N1 that one first end points is coupled to crystal oscillator 1022, and a control end points is coupled to the first controlling signal EN.Transistor seconds 1026f has one second end points that a control point end N5 is coupled to the 3rd switch 1026e.The 4th switch 1026g has the control end points N5 that one first end points is coupled to transistor seconds, and one second end points is coupled to one second supply voltage (that is a supply voltage Vdd), and a control end points is coupled to the second controlling signal ENB.The second resistance 1026h has one first exit point (that is source terminal) that one first end points N6 is coupled to transistor seconds 1026f.The 5th switch 1026i has one second end points that one first end points N7 is coupled to the second resistance 1026h, and one second end points is coupled to supply voltage Vdd, and a control end points is coupled to the first controlling signal EN.In addition, one second exit point (that is the drain end) N8 of the first transistor 1026b is coupled to one second exit point (that is drain end) of transistor seconds 1026f, and is coupled to the second end points N2 of crystal oscillator.
Can learn from the inverter 1026 of Fig. 1 a, when oscillating circuit 102 is in this operating mode and inverter 1026 and is in this enabled status, the control circuit 104 first controlling signal EN that produces will set and connect (switch on) first switch 1026a, the 3rd switch 1026e and the 5th switch 1026i, and the second controlling signal ENB will set and disconnects (switch off) second switch 1026c and the 4th switch 1026g.Otherwise, be in this and press down can state the time when oscillating circuit 102 is in this operating mode and inverter 1026, the control circuit 104 first controlling signal EN that produces will set and disconnect the first switch 1026a, the 3rd switch 1026e and the 5th switch 1026i so that the path between inverter 1026 and the supply voltage Vdd is (open-circuit) state that opens circuit, and the second controlling signal ENB will set and connects second switch 1026c and the 4th switch 1026g.Please note, this field has knows that usually the knowledgeable can also be arranged at the 5th switch 1026i between this second end points and earthed voltage Vgnd of the first resistance 1026d, or being arranged at optional position on the polyphone path of the first transistor 1026b, transistor seconds 1026f and supply voltage Vdd, earthed voltage Vgnd, it also belongs to category of the present invention place.Thus, be in this and press down can state the time when oscillating circuit 102 is in this operating mode and inverter 1026, because the path is an off state between the supply voltage Vdd of inverter 1026 and the earthed voltage Vgnd, therefore this moment, inverter 102 had any power consumption hardly.
In addition, in order further to reduce the power consumption of oscillation signal generation device 100, in the present embodiment, resistive element 1,024 one transmission locks (Transmission gate) do in fact.When oscillating circuit 102 was in this operating mode and inverter 1026 and is in this enabled status, it was a conducting state that the control circuit 104 first controlling signal EN that produces will be used for setting this transmission lock; And be in this and press down can state the time when oscillating circuit 102 is in this operating mode and inverter 1026, the control circuit 104 first controlling signal EN that produces will be used for setting this transmission lock be a not on-state to reduce the electric current that reduces the resistive element 1024 of flowing through, further reduce the power consumption of oscillation signal generation device 100.
The schematic diagram of another embodiment of Fig. 1 b oscillation signal generation device 100 of the present invention wherein has identical or similar function with the assembly that Fig. 1 a has an identical numbering, relevantly is described in this omission.The difference of Fig. 1 b and Fig. 1 a maximum is that the inverter 1026 among Fig. 1 a is replaced into the amplifier 1028 among Fig. 1 b.Amplifier 1028 provides enough big enlargement ratio to oscillating circuit 102, so that a loop gain (Loop gain) is satisfied greater than 1 condition in the loop that amplifier 1028 is constituted with resistive element 1024 under the operating state of normal power supply, and cause oscillating circuit 102 to be able to successfully starting of oscillation.On function, also amplifier among Fig. 1 b 1028 and the inverter 1026 among Fig. 1 a can be considered as the vibration generator of oscillating circuit 102, therefore amplifier 1028 among Fig. 1 b of the present invention and the inverter 1026 among Fig. 1 a can also be replaced with a vibration generator, and it also can reach similar effect.In other words, the different execution modes of inverter 1026 vibration generators of the present invention among the amplifier 1028 among Fig. 1 b and Fig. 1 a.Following (when for example desire starts oscillating circuit 102, when oscillation signal Sout amplitude is too small or vibration generator surpass a period of time when not connecing electricity) of some specified conditions, control circuit 104 produces that the first controlling signal EN closes 1028b to connect the 6th switch 1028a, minion, octavo is closed 1028c.And when oscillating circuit 102 starting of oscillation smoothly, it is certain when big or small that the amplitude of oscillation signal Sout has reached, control circuit 104 produce the first controlling signal EN with disconnect the 6th switch 1028a, minion is closed 1028b, octavo pass 1028c.At this moment, amplifier 1028 can consume any energy hardly.
Yet, please refer to Fig. 2.Shown in Figure 2ly be in this and press down can state the time one sequential chart of this resonance signal (that is oscillation signal Sosc) that crystal oscillator 1022 is produced when oscillating circuit 102 is in this operating mode and inverter 1026.Because crystal oscillator 1022 is not a perfect loss-free oscillator, therefore the energy that is stored in the crystal oscillator 1022 can reduce lentamente along with the time, that is the amplitude of oscillation signal Sosc (that is the peak is to peak (peak-to-peak) value) can be along with the time reduces lentamente.When the amplitude of oscillation signal Sosc is reduced to a predetermined critical amplitude or after the starting of oscillation after one section preset time, control circuit 104 can again press down inverter 1026 can switch to this enabled status by state from this, so that energy is again injected crystal oscillator 1022, that is utilize inverter 1026 to carry out starting of oscillation once again, this moment, the amplitude of oscillation signal Sosc again can be along with the time becomes greatly gradually, up to its peak to the peak near the pressure reduction between supply voltage Vdd and the earthed voltage Vgnd till.Please note, though the control circuit 104 shown in Fig. 1 a is used for receiving output oscillation signal Sout, usually know that the knowledgeable should understand but this field has, when inverter 1026 pressed down the energy state for being somebody's turn to do, the oscillation signal Sosc that crystal oscillator 1022 is produced will export oscillation signal Sout.
Therefore, Fig. 3 of the present invention provides one first embodiment schematic diagram of control circuit 104, and wherein control circuit 104 includes a clock counter 1042 and a decision circuitry 1044.Clock counter 1042 is used for exporting the periodicity of oscillation signal Sout to produce a count results N.Decision circuitry 1044 is coupled to clock counter 1042, it is used for when oscillating circuit 102 is in this operating mode and inverter 1026 and is in this enabled status, judge whether count results N reaches one first predetermined period number, when count results N reaches this first predetermined period and counts, decision circuitry 1044 with regard to set the first controlling signal EN and the second controlling signal ENB with inverter 1026 from the state of this activation switch to this press down can state.Note that first predetermined period is counted minimum can be 1, that is, but when oscillating circuit 102 has produced the signal of one-period of Be Controlled circuit 104 identifications, can with inverter 1026 from the state of this activation switch to this press down can state.
Be in this and press down can state the time when oscillating circuit 102 is in this operating mode and inverter 1026, decision circuitry 1044 judges in addition whether count results N reaches one second predetermined period number, when count results N reaches this second predetermined period and counts, the amplitude of then judging oscillation signal Sosc has reached this predetermined critical amplitude, and then decision circuitry 1044 is just set the first controlling signal EN and the second controlling signal ENB presses down inverter 1026 can switch to this enabled status by state from this.
Further, after oscillating circuit 102 is activated, clock counter 1042 will begin to move the periodicity of the output oscillation signal Sout that produced with counting oscillation signal generation device 100, when count results N reaches this first predetermined period and counts, decision circuitry 1044 with regard to set the first controlling signal EN and the second controlling signal ENB with inverter 1026 from the state of this activation switch to this press down can state.Then, clock counter 1042 will restart to count the periodicity of the oscillation signal Sosc (that is resonance signal) that crystal oscillator 1022 produced, when count results N reaches this second predetermined period and counts, decision circuitry 1044 switches to the state of this activation with inverter 1026 from the state that this presses down energy with regard to setting the first controlling signal EN and the second controlling signal ENB, and repeats above-mentioned action again and again.Thus, via after the design suitably, 1022 most of the times of inverter be in press down can state, so its consumed current just can reduce significantly.
Shown in Figure 4 when inverter 1026 in this enabled status and should press down a sequential chart of the electric current I (that is current sinking of oscillating circuit 102) of flow through when switching between can state the first transistor 1026b and transistor seconds 1026f.Can learn from Fig. 4, when inverter 1026 is in this enabled status, the current sinking of oscillating circuit 102 is just shown in curve 402, the one average current is the fluctuating current greater than zero, and press down can state the time when inverter 1026 is in this, it is zero that the current sinking of oscillating circuit 102 just falls, shown in curve 404.Therefore, after oscillating circuit 102 is activated, if inverter 1026 be in this press down can state total time when inverter 1026 is in the total time of this enabled status, the average consumed cur-rent of oscillating circuit 102 will level off to zero.
On the other hand, in order further to reduce the power consumption of oscillation signal generation device 100, do in fact in the mode of a digital circuit at control circuit 104 of the present invention, as shown in Figure 5.One second embodiment schematic diagram of Fig. 5 the present invention one control circuit 500, wherein control circuit 500 includes one first digital frequency eliminator 502, one second a digital frequency eliminator 504 and a logic lock 506.The first numerical digit frequency eliminator 502 is coupled to the second end points N2 of crystal oscillator 1022, is used for output oscillation signal Sout is carried out the computing of signal frequency elimination, to produce one first frequency elimination oscillation signal Sd1.The second numerical digit frequency eliminator 504 is coupled to the first numerical digit frequency eliminator 502, is used for the first frequency elimination oscillation signal Sd1 is carried out the computing of signal frequency elimination to produce one second frequency elimination oscillation signal Sd2.Logic lock 506 includes a NOR gate 5062 and an inverter 5064, and it is coupled to the first numerical digit frequency eliminator 502 and the second digital frequency eliminator 504 is used for setting the first controlling signal EN and the second controlling signal ENB according to the first frequency elimination oscillation signal Sd1 and the second frequency elimination oscillation signal Sd2.Please note, when oscillating circuit 102 is in this operating mode and inverter 1026 and is in this enabled status, 502 pairs of output of first digital frequency eliminator oscillation signal Sout carries out the computing of signal frequency elimination to produce the first frequency elimination oscillation signal Sd1, and be in this and press down can state the time when oscillating circuit 102 is in this operating mode and inverter 1026,502 couples of oscillation signal Sosc of the first digital frequency eliminator carry out the computing of signal frequency elimination to produce the first frequency elimination oscillation signal Sd1.In addition, the first digital frequency eliminator 502 and the second digital frequency eliminator 504 can come to do in fact with clock counter, and this field has knows that usually the knowledgeable should understand its circuit structure, so do not repeat them here.
Please note, in the present embodiment, the first digital frequency eliminator 502 can be to output oscillation signal Sout divided by one first particular divisor to produce the first frequency elimination oscillation signal Sd1, and the second digital frequency eliminator 504 can produce the second frequency elimination oscillation signal Sd2 divided by one second particular divisor (for example this of present embodiment second particular divisor is two) to the first frequency elimination oscillation signal Sd1, as shown in Figure 6.The sequential chart of the first frequency elimination oscillation signal Sd1 of the control circuit 500 of Fig. 5 shown in Figure 6, the second frequency elimination oscillation signal Sd2, the first controlling signal EN and the second controlling signal ENB.Because the frequency of oscillation of the first frequency elimination oscillation signal Sd1 is the twice of the second frequency elimination oscillation signal Sd2, therefore every a very first time T1, the voltage quasi position of the first controlling signal EN will switch to the accurate position of a high voltage from the accurate position of a low-voltage, and the voltage quasi position of the second controlling signal ENB will switch to the accurate position of this low-voltage from the accurate position of this high voltage, and the first controlling signal EN can continue one second time T 2 in the accurate position of this high voltage, the second controlling signal ENB also can continue second time T 2 in the accurate position of low high voltage simultaneously, wherein very first time T1 is the clock cycle of the second frequency elimination oscillation signal Sd2, and second time T 2 is half clock cycle of the first frequency elimination oscillation signal Sd1.Therefore, can learn from above description, via this second particular divisor of this first particular divisor of suitably setting the first digital frequency eliminator 502 and the second numerical digit frequency eliminator 504, just can at random be set the start-up time of the start-up time of the first controlling signal EN and the second controlling signal ENB.Further, this second particular divisor that present embodiment see through to be set this first particular divisor of the first digital frequency eliminator 502 and the second numerical digit frequency eliminator 504 decides the time of the open and close of inverter 1026, to save the power consumption of inverter 1026.
Please note, above-mentioned control circuit 104 is that control inverter 1026 intermittently opens and closes with a purpose of the design of control circuit 500, to save the power consumption of inverter 1026, and the time point that opens and closes inverter 1026 can be according to designer's experience, and it is (for example shown in Figure 6 to set the fixing open and close time, open half clock cycle in per two clock cycle and close a half clock cycle), to reduce the complexity of control circuit.In another embodiment, when inverter 1026 cut out, whether the amplitude of control circuit 104 detecting oscillation signal Sosc decayed to this predetermined critical amplitude, when the amplitude fading of oscillation signal Sosc to this predetermined critical amplitude activation inverter 1026 then; When inverter 1026 is opened, whether the amplitude of control circuit 104 detecting oscillation signal Sosc returns to a normal amplitude, if amplitude recovery is normal, then control circuit 104 just presses down energy inverter 1026, therefore in another embodiment of the present invention, control circuit 104 also can directly utilize voltage detection circuit, and for example a peak does in fact to peak (peak-to-peak) circuit for detecting.In this embodiment, when oscillating circuit 102 is under this operating mode and inverter 1026 when being in this enabled status, the peak of output oscillation signal Sout is detected to peak value to the peak circuit for detecting in this peak, and when peak value being reached one first critical peak to peak value in this peak, this peak to the peak circuit for detecting set the first controlling signal EN and the second controlling signal ENB inverter 1026 is switched to from this enabled status that this presses down can state.When oscillating circuit 102 is under this operating mode and inverter 1026 is in this and presses down can state the time, when this peak in addition reaches (that is being reduced to) one second critical peak to peak value in this peak to peak value to the peak circuit for detecting, setting the first controlling signal EN and the second controlling signal ENB presses down inverter 1026 can switch to this enabled status by state from this, so that this peak returns to (that is increasing to) this first critical peak to peak value to peak value, then repeat the power consumption that inverter 1026 is saved in above-mentioned action again and again.
The letter speech, the above-mentioned oscillation signal production method that proposes can be reduced to step shown in Figure 7.Embodiment flow chart according to a kind of oscillation signal production method 700 of the present invention shown in Figure 7, and oscillation signal production method 700 is used for controlling an oscillating circuit, oscillating circuit 102 as shown in Figure 1a.For simplicity, follow-up explanation about oscillation signal production method 700 also please refer to the oscillating circuit 102 shown in Fig. 1 a.If can reach identical result substantially, the sequence of steps that does not need necessarily to shine in the flow process shown in Figure 7 is carried out, and step shown in Figure 7 not necessarily will carry out continuously, that is other step also can be inserted wherein.Oscillation signal production method 700 includes the following step:
Step 702: start oscillation signal generation device 100 to produce output oscillation signal Sout;
Step 704: detecting output oscillation signal Sout;
Step 706: when detecting a certain particular condition, produce the first controlling signal EN and the second controlling signal ENB inverter 1026 is switched to from this enabled status that this presses down can state;
Step 708: detecting output oscillation signal Sout;
Step 710: when detecting another particular condition, produce the first controlling signal EN and the second controlling signal ENB inverter 1026 is pressed down and can switch to this enabled status by state from this, skip to step 704.
Please note, a certain particular condition of the present invention can be considered for one first scheduled time, and another particular condition can be considered for one second scheduled time, the parameter that this first scheduled time and also available other same concept of this second scheduled time maybe can have identical result replaces, and it also belongs to category of the present invention place.For instance, step 704 can also be detected the one-period number of output oscillation signal Sout, and when this periodicity reaches a count results that should first scheduled time, just in step 706 produce the first controlling signal EN and the second controlling signal ENB with inverter 1026 from this enabled status switch to should but the energy state.In like manner, step 708 can also be detected the one-period number of output oscillation signal Sout, and when this periodicity reaches a count results that should second scheduled time, just produce the first controlling signal EN in step 710 and with the second controlling signal ENB inverter 1026 is pressed down the energy state from this and switch to this enabled status.In addition, step 704 can also be detected the peak of output oscillation signal Sout to peak value, and when this peak reaches one first predetermined peak to peak value to peak value, just produce the first controlling signal EN and the second controlling signal ENB in step 706 but inverter 1026 is switched to this energy state from this enabled status.In like manner, step 708 can also be detected the peak of output oscillation signal Sout to peak value, and when this peak reaches one second predetermined peak to peak value to peak value, just in the step 710 generation first controlling signal EN and the second controlling signal ENB inverter 1026 is pressed down and can switch to this enabled status by state from this.Then, rebound step 704 repeats same action again when step 710 is finished, and just the power consumption of inverter 1026 can be dropped to minimumly thus, and then reduces the power consumption of whole oscillation signal generation device 100.
In sum, oscillation signal generation device 100 of the present invention is closed oscillating circuit 102 after oscillating circuit 102 successful starting of oscillations to save the power consumption of oscillating circuit 102 again, a this moment and a resonance signal that utilizes crystal oscillator 1022 to be produced are exported oscillation signal Sout as it, the energy of this resonance signal that is produced when crystal oscillator 1022 again starts oscillating circuit 102 when being reduced to a predetermined extent, so just can reach the purpose of reduction power consumption.Therefore, compared to traditional crystal oscillator, oscillation signal generation device of the present invention 100 does not just need to see through low transduction and does not save electric current with the method for designing of low current, and then also the crystal oscillator than traditional is little to make oscillation signal generation device 100 occupied chip areas of the present invention.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (24)
1. an oscillation signal generation device is characterized in that, includes:
One oscillating circuit includes:
One crystal oscillator has one first end points and one second end points, is used for producing an oscillation signal;
One resistive element has this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And
One vibration generator has this first end points that an input endpoint is coupled to this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator; And
One control circuit, be coupled to this crystal oscillator, be used for being in an operating mode to produce an output during oscillation signal in this oscillating circuit, produce a controlling signal and this vibration generator is switched to one from an activation state press down can state, and come this output oscillation signal as this oscillating circuit according to this oscillation signal that this crystal oscillator produced.
2. oscillation signal generation device according to claim 1, it is characterized in that, wherein this vibration generator operates between one first supply voltage and the one second supply voltage, and press down can state the time when this vibration generator is in this, be in an off state between this vibration generator and this first voltage quasi position or this second voltage quasi position.
3. oscillation signal generation device according to claim 1 is characterized in that, wherein this resistive element one transmission lock, when being in this, presses down can state the time this vibration generator, this transmission lock is in a not on-state, and when this vibration generator was in this enabled status, this transmission lock was in a conducting state.
4. oscillation signal generation device according to claim 3 is characterized in that, wherein this transmission lock is controlled by this control circuit.
5. oscillation signal generation device according to claim 1, it is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, this one scheduled time of control circuit timing, and arrive back in this scheduled time and set this controlling signal and this vibration generator is switched to from this enabled status should press down the energy state.
6. oscillation signal generation device according to claim 1, it is characterized in that, wherein be in this and press down can state the time when this oscillating circuit is in this operating mode and this vibration generator, this control circuit is one scheduled time of timing in addition, and in this this controlling signal of scheduled time arrival back setting this vibration generator is pressed down and can switch to this enabled status by state from this.
7. oscillation signal generation device according to claim 1 is characterized in that, wherein this control circuit includes:
One clock counter is used for counting the periodicity of this output oscillation signal to produce a count results; And
One decision circuitry, be coupled to this clock counter, be used for when this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period and counts, this decision circuitry produce this controlling signal with this vibration generator from the state of this activation switch to this press down can state.
8. oscillation signal generation device according to claim 7, it is characterized in that, wherein this decision circuitry in addition is in this operating mode and this vibration generator in this oscillating circuit and is in should press down the energy state time, judge whether this count results reaches one second predetermined period number, when this count results reached this second predetermined period and counts, this decision circuitry was set this controlling signal in addition this vibration generator is pressed down and can switch to this enabled status by state from this.
9. oscillation signal generation device according to claim 1 is characterized in that, wherein this control circuit includes:
One peak is to the peak circuit for detecting, when this oscillating circuit is under this operating mode and this vibration generator when being in this enabled status, a peak of this output oscillation signal is detected to peak value to the peak circuit for detecting in this peak, and when peak value being reached one first critical peak to peak value in this peak, this peak to the peak circuit for detecting set this controlling signal this vibration generator is switched to from this enabled status that this presses down can state.
10. oscillation signal generation device according to claim 9, it is characterized in that, wherein be under this operating mode and this vibration generator is in this and presses down can state the time when this oscillating circuit, when this peak in addition reaches one second critical peak to peak value in this peak to peak value to the peak circuit for detecting, set this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
11. oscillation signal generation device according to claim 1 is characterized in that, wherein this control circuit includes:
One first numerical digit frequency eliminator is coupled to this crystal oscillator, is used for this output oscillation signal is carried out the computing of signal frequency elimination, to produce one first frequency elimination oscillation signal;
One second numerical digit frequency eliminator is coupled to this first numerical digit frequency eliminator, is used for this first frequency elimination oscillation signal is carried out the computing of signal frequency elimination, to produce one second frequency elimination oscillation signal; And
One logic lock is coupled to this first digital frequency eliminator and this second digital frequency eliminator, is used for setting this controlling signal according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal.
12. oscillation signal generation device according to claim 1 is characterized in that, wherein this controlling signal includes one first controlling signal and one second controlling signal, and this vibration generator includes:
One first switch has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first controlling signal;
One the first transistor has one second end points that a control point end is coupled to this first switch;
One second switch has this control end points that one first end points is coupled to this first transistor, and one second end points is coupled to one first supply voltage, and a control end points is coupled to this second controlling signal;
One first resistance has one first exit point that one first end points is coupled to this first transistor, and one second end points is coupled to this first supply voltage;
One the 3rd switch has this first end points that one first end points is coupled to this crystal oscillator, and a control end points is coupled to this first controlling signal;
One transistor seconds has one second end points that a control point end is coupled to the 3rd switch;
One the 4th switch has this control end points that one first end points is coupled to this transistor seconds, and one second end points is coupled to one second supply voltage, and a control end points is coupled to this second controlling signal;
One second resistance has one first exit point that one first end points is coupled to this transistor seconds; And
One the 5th switch has one second end points that one first end points is coupled to this second resistance, and one second end points is coupled to this second supply voltage, and a control end points is coupled to this first controlling signal;
Wherein one second exit point of this first transistor is coupled to one second exit point of this transistor seconds, and is coupled to this second end points of this crystal oscillator.
13. an oscillation signal production method is used for controlling an oscillating circuit, this oscillating circuit includes:
One crystal oscillator has one first end points and one second end points, is used for producing an oscillation signal;
One resistive element has this first end points that one first end points is coupled to this crystal oscillator, and one second end points is coupled to this second end points of this crystal oscillator; And
One vibration generator has this first end points that an input endpoint is coupled to this crystal oscillator, and an exit point is coupled to this second end points of this crystal oscillator;
It is characterized in that this oscillation signal production method includes:
Be in an operating mode to produce an output during oscillation signal in this oscillating circuit, produce a controlling signal and this vibration generator is switched to one from an activation state press down can state; And
Press down can state the time when this vibration generator is in this, come this output oscillation signal as this oscillating circuit according to this oscillation signal that this crystal oscillator produced.
14. oscillation signal production method according to claim 13, it is characterized in that, wherein this vibration generator operates between one first supply voltage and the one second supply voltage, and produces this controlling signal and this vibration generator is switched to this step that presses down the energy state from this enabled status include in addition:
With the path setting between this vibration generator and this first voltage quasi position or this second voltage quasi position is an off state.
15. oscillation signal production method according to claim 13 is characterized in that, this resistive element one transmission lock wherein, and produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include in addition:
Press down can state the time when this vibration generator is in this, should transmit lock and be set at a not on-state; And
When this vibration generator is in this enabled status, should transmits lock and be set at a conducting state.
16. oscillation signal production method according to claim 13, it is characterized in that, wherein when this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
One scheduled time of timing; And
In this this controlling signal of scheduled time arrival back setting this vibration generator is switched to this from this enabled status and press down the energy state.
17. oscillation signal production method according to claim 13 is characterized in that, wherein is in this and presses down can state the time when this oscillating circuit is in this operating mode and this vibration generator, other includes:
One scheduled time of timing; And
Arriving this controlling signal of back setting in this scheduled time presses down this vibration generator can switch to this enabled status by state from this.
18. oscillation signal production method according to claim 13 is characterized in that, wherein produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
The periodicity of counting this output oscillation signal is to produce a count results; And
When this oscillating circuit is in this operating mode and this vibration generator and is in this enabled status, judge whether this count results reaches one first predetermined period number, when this count results reaches this first predetermined period and counts, produce this controlling signal with this vibration generator from the state of this activation switch to this press down can state.
19. oscillation signal production method according to claim 18, it is characterized in that, wherein be in this and press down can state the time when this oscillating circuit is in this operating mode and this vibration generator, produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include in addition:
Judge whether this count results reaches one second predetermined period number, when this count results reaches this second predetermined period and counts, set this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
20. oscillation signal production method according to claim 13 is characterized in that, wherein produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
When this oscillating circuit is under this operating mode and this vibration generator when being in this enabled status, a peak of detecting this output oscillation signal is to peak value; And
When this peak reaches one first critical peak to peak value to peak value, set this controlling signal this vibration generator is switched to from this enabled status that this presses down can state.
21. oscillation signal production method according to claim 20, it is characterized in that, wherein be under this operating mode and this vibration generator is in this and presses down can state the time when this oscillating circuit, produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include in addition:
When this peak reaches one second critical peak to peak value to peak value, set this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
22. oscillation signal production method according to claim 13 is characterized in that, wherein produce this controlling signal with this vibration generator from this enabled status switch to this press down can state step include:
This output oscillation signal is carried out the computing of signal frequency elimination to produce one first frequency elimination oscillation signal;
This first frequency elimination oscillation signal is carried out the computing of signal frequency elimination to produce one second frequency elimination oscillation signal; And
Set this controlling signal according to this first frequency elimination oscillation signal and this second frequency elimination oscillation signal.
23. oscillation signal production method according to claim 13 is characterized in that, wherein is in this and presses down can state the time when this oscillating circuit is in this operating mode and this vibration generator, other includes:
Detect this oscillation signal;
When detecting this oscillation signal when meeting a particular condition, then produce this controlling signal this vibration generator is pressed down and can switch to this enabled status by state from this.
24. oscillation signal production method according to claim 23 is characterized in that, wherein this particular condition periodicity of fixing position or this oscillation signal in advance for the voltage conforms one of this oscillation signal is accumulate to a predetermined number.
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