CN112787661A - Quick-oscillation-starting crystal oscillator driving circuit and integrated circuit - Google Patents
Quick-oscillation-starting crystal oscillator driving circuit and integrated circuit Download PDFInfo
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- CN112787661A CN112787661A CN202011622436.6A CN202011622436A CN112787661A CN 112787661 A CN112787661 A CN 112787661A CN 202011622436 A CN202011622436 A CN 202011622436A CN 112787661 A CN112787661 A CN 112787661A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L3/00—Starting of generators
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Abstract
The application discloses quick start-up crystal oscillator drive circuit includes: the first series unit comprises a first resistor, a first inductor and a first capacitor; the second capacitor, the adjustable resistance unit and the inverter are connected with the first series unit in parallel; the first grounding capacitor is connected with the input end of the phase inverter; the second grounding capacitor is connected with the output end of the phase inverter; and the controller controls the equivalent resistance value of the adjustable resistance unit according to the input end signal of the phase inverter. The controller adjusts the resistance value of the adjustable resistance unit according to the received information, and can meet different requirements of the equivalent resistance of the quick oscillation starting crystal oscillator driving circuit connected with the phase inverter in parallel under different states, so that the effects of quick oscillation starting, no increase of oscillation amplitude and no damage to the service life are achieved in the same quick oscillation starting crystal oscillator driving circuit. Correspondingly, the application also discloses an integrated circuit with the same beneficial effect.
Description
Technical Field
The invention relates to the field of crystal oscillator circuit design, in particular to a quick oscillation starting crystal oscillator driving circuit and an integrated circuit.
Background
Currently, a conventional crystal oscillator model is shown in fig. 1a, and includes an inductor Ls, a capacitor Cs, a resistor Rs, and a package capacitor Cp, and its intrinsic resonant frequency is:
considering the presence of the package capacitance Cp, its resonant frequency is:
because of the existence of the resistor Rs, the resonant network cannot maintain oscillation, and a negative resistor needs to be externally connected to counteract the consumption of the resistor Rs. As shown in fig. 1b, a negative resistance is formed by an inverter and capacitors C01 and C02 to provide energy for the crystal oscillator model, while resistor R01 provides bias voltage for the inverter. The small signal model of fig. 1b is shown in fig. 2 a-2 c, and can be found as follows:
wherein gm1Is the transconductance of the equivalent switch tube M1 of the inverter;
thus is provided with
Then Zm＝Zab||R01；
Further comprises
Converting s to the frequency domain
From the above formula, the impedance ZCHas a negative real part of (g) and follows gm1Vary, and thus can be changed by changing gm1To make ZCIs greater than Rs, thereby maintaining the crystal oscillator oscillating.
However, it should be noted that while the resistor R01 provides the bias voltage for the inverter, its resistance can also change ZCThe value of (c). The whole circuit is operated under the condition of small signal when starting oscillation, and the small signal model is shown as figure 2c, and can obtain:
wherein v isiFor small signal equivalent input voltage, voTo output voltage r to the loadoIs the internal resistance of the switching tube M1, so that the small signal gain is
Due to roThe crystal oscillator model is very large, so that the signal gain can be increased by increasing the resistance value of R01, the oscillation starting speed of the circuit is higher as the resistance R01 is larger and the signal gain is larger, and the oscillation amplitude of the circuit is increased along with the increase of the gain, so that the service life of the crystal oscillator model is shortened, and the two effects of high oscillation starting speed and no influence on the service life of the circuit cannot be realized simultaneously by the conventional crystal oscillator model.
Therefore, how to provide a solution to the above technical problems is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a fast oscillation starting crystal oscillator driving circuit and an integrated circuit, so as to meet the requirement of fast oscillation starting without increasing oscillation amplitude. The specific scheme is as follows:
a fast oscillation starting crystal oscillator driving circuit includes:
the first series unit comprises a first resistor, a first inductor and a first capacitor;
the second capacitor, the adjustable resistance unit and the inverter are connected with the first series unit in parallel;
the first grounding capacitor is connected with the input end of the phase inverter;
the second grounding capacitor is connected with the output end of the phase inverter;
and the controller controls the equivalent resistance value of the adjustable resistance unit according to the input end signal of the phase inverter.
Preferably, the controller is configured to:
judging the circuit state of the rapid oscillation starting crystal oscillator driving circuit to be an oscillation starting stage or an oscillation stage according to the input end signal of the phase inverter;
when the oscillation starting stage is carried out, the equivalent resistance value of the adjustable resistance unit is controlled to be the maximum resistance value;
and when in the oscillation stage, controlling the equivalent resistance value of the adjustable resistance unit to be the minimum resistance value.
Preferably, the controller is specifically configured to:
and gradually controlling the equivalent resistance value of the adjustable resistance unit to be reduced from the maximum resistance value to the minimum resistance value in the oscillation stage.
Preferably, the adjustable resistance unit comprises a second resistance, one or more third resistances, and one or more switches, wherein:
the second resistor is connected with all the third resistors in series;
each third resistor is connected with one switch in parallel.
Preferably, the controller includes:
the input end of the shaping circuit is connected with the input end of the phase inverter and outputs the crystal oscillator clock when the oscillation signal is stable;
the signal input end is connected with a power supply, the clock input end is connected with the output end of the shaping circuit, and the output end of the shift register controls the closed states of the switches.
Preferably, the shift register includes a plurality of D flip-flops connected in sequence, wherein:
the D input end of the first D trigger is connected with the power supply, and the D input ends of the other D triggers are connected with the Q output end of the previous D trigger;
and the clock input end of each D flip-flop is connected with the output end of the shaping circuit.
Preferably, when the adjustable resistance unit includes a plurality of switches, output ends of a plurality of action triggers are connected with control ends of the plurality of switches one by one, and when the action triggers output a high level, the corresponding switches are closed;
the plurality of action triggers are specifically: a plurality of said D flip-flops including a last said D flip-flop.
Preferably, when the adjustable resistance unit includes one switch, the output terminal of the last D flip-flop is connected to the control terminal of the switch, and when the D flip-flop outputs a high level, the switch is closed.
Preferably, the shaping circuit includes:
a low pass filter connected to an input of the inverter;
and the non-inverting input end of the comparator is connected with the output end of the low-pass filter, the inverting input end of the comparator is connected with the input end of the phase inverter, and the output end of the comparator is used as the output end of the shaping circuit.
Correspondingly, the present application also discloses an integrated circuit comprising: the rapid oscillation starting crystal oscillator driving circuit as described in any one of the above.
The application discloses quick start-up crystal oscillator drive circuit includes: the first series unit comprises a first resistor, a first inductor and a first capacitor; the second capacitor, the adjustable resistance unit and the inverter are connected with the first series unit in parallel; the first grounding capacitor is connected with the input end of the phase inverter; the second grounding capacitor is connected with the output end of the phase inverter; and the controller controls the equivalent resistance value of the adjustable resistance unit according to the input end signal of the phase inverter. The controller adjusts the resistance value of the adjustable resistance unit according to the received information, and can meet different requirements of the equivalent resistance of the quick oscillation starting crystal oscillator driving circuit connected with the phase inverter in parallel under different states, so that the effects of quick oscillation starting, no increase of oscillation amplitude and no damage to the service life are achieved in the same quick oscillation starting crystal oscillator driving circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1a is a diagram illustrating a structure distribution of a crystal oscillator model in the prior art;
FIG. 1b is a schematic diagram of another prior art crystal oscillator model;
FIG. 2a is a structural distribution diagram of a small signal model of a prior art crystal oscillator model;
FIG. 2b is a structural distribution diagram of another small signal model of a prior art crystal oscillator model;
FIG. 2c is a structural distribution diagram of another small signal model of a prior art crystal oscillator model;
FIG. 3 is a structural distribution diagram of a fast oscillation-starting crystal oscillator driving circuit according to an embodiment of the present invention;
FIG. 4 is a structural distribution diagram of an adjustable resistance unit according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a structure of an exemplary shaping circuit according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a structure distribution of a specific shift register according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the crystal oscillator model shown in fig. 1b, the larger the resistor R01 is, the larger the signal gain is, the faster the oscillation starting speed of the circuit is, and simultaneously, along with the increase of the gain, the oscillation amplitude of the circuit is also increased, which results in the shortened service life of the crystal oscillator model.
The controller adjusts the resistance value of the adjustable resistance unit according to the received information, and can meet different requirements of the equivalent resistance of the quick oscillation starting crystal oscillator driving circuit connected with the phase inverter in parallel under different states, so that the effects of quick oscillation starting, no increase of oscillation amplitude and no damage to the service life are achieved in the same quick oscillation starting crystal oscillator driving circuit.
The embodiment of the invention discloses a quick oscillation starting crystal oscillator driving circuit, which is shown in a figure 3 and comprises the following components:
a first series unit 1 including a first resistor R1, a first inductor L1, and a first capacitor C1;
a second capacitor C2, an adjustable resistance unit 2 and an inverter inv all connected in parallel with the first series unit 1;
a first ground capacitor C01 connected to the input terminal of the inverter inv;
a second ground capacitor C02 connected to the output terminal of the inverter inv;
and the controller 3 is used for controlling the equivalent resistance value of the adjustable resistance unit 2 according to the input end signal of the inverter inv.
It can be understood that the first series unit 1 including the first resistor R1, the first inductor L1, the first capacitor C1, and the second capacitor C2 form a resonant network, but the resonant network cannot maintain oscillation, the inverter inv, the first grounded capacitor C01 and the second grounded capacitor C02 are combined as a negative resistor to provide oscillation energy for the crystal oscillator model, and the adjustable resistor unit 2 provides a bias voltage for the inverter inv.
Further, an input end signal of the inverter inv, that is, an output signal of the rapid oscillation starting crystal oscillator driving circuit, the state of the rapid oscillation starting crystal oscillator driving circuit can be determined according to the output signal, after the stable oscillation state is entered, the input end signal is a stable sinusoidal signal, it is known that the faster the oscillation starting speed is, the better the equivalent resistance of the adjustable resistance unit 2 required to provide bias voltage for the inverter inv is, and after the stable oscillation state is entered, the smaller the required oscillation amplitude is, it is ensured that the service life of the rapid oscillation starting crystal oscillator driving circuit is not damaged, the smaller the equivalent resistance of the adjustable resistance unit 2 is required, the better the controller 3 adjusts the equivalent resistance of the adjustable resistance unit 2 according to the circuit requirement, that is, the controller 3 is used for:
judging the circuit state of the rapid oscillation starting crystal oscillator driving circuit to be an oscillation starting stage or an oscillation stage according to the input end signal of the phase inverter inv;
when in the oscillation starting stage, the equivalent resistance value of the adjustable resistance unit 2 is controlled to be the maximum resistance value;
when in the oscillation phase, the equivalent resistance value of the adjustable resistance unit 2 is controlled to be the minimum resistance value.
Further, in order to avoid too fast jump of the equivalent resistance of the adjustable resistance unit 2, which can be adjusted step by step, the controller 3 is specifically configured to:
when in the oscillation phase, the equivalent resistance value of the adjustable resistance unit 2 is gradually controlled to be reduced from the maximum resistance value to the minimum resistance value.
The application discloses quick start-up crystal oscillator drive circuit includes: the first series unit comprises a first resistor, a first inductor and a first capacitor; the second capacitor, the adjustable resistance unit and the inverter are connected with the first series unit in parallel; the first grounding capacitor is connected with the input end of the phase inverter; the second grounding capacitor is connected with the output end of the phase inverter; and the controller controls the equivalent resistance value of the adjustable resistance unit according to the input end signal of the phase inverter. The controller adjusts the resistance value of the adjustable resistance unit according to the received information, and can meet different requirements of the equivalent resistance of the quick oscillation starting crystal oscillator driving circuit connected with the phase inverter in parallel under different states, so that the effects of quick oscillation starting, no increase of oscillation amplitude and no damage to the service life are achieved in the same quick oscillation starting crystal oscillator driving circuit.
The embodiment of the invention discloses a specific fast oscillation starting crystal oscillator driving circuit, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme. Specifically, the method comprises the following steps:
referring to fig. 4, the adjustable resistance unit 2 includes a second resistor R2, one or more third resistors R3, and one or more switches K, wherein:
the second resistor R2 is connected in series with all the third resistors R3;
each third resistor R3 is connected in parallel with a switch K.
It can be seen that the open/close state of each switch K determines that the third resistor R3 connected in parallel with it is short-circuited or takes into account the equivalent resistance, and the controller 3 can control the state of each switch K.
Further, the controller 3 includes:
the input end of the shaping circuit is connected with the input end of the phase inverter inv and outputs the crystal oscillator clock CLK when the oscillation signal is stable;
the signal input end is connected with a power supply, the clock input end is connected with the output end of the shaping circuit, and the output end of the shaping circuit controls the shift register of the closed state of the switches K.
It can be understood that the shaping circuit can output the crystal clock CLK when the interrupt signal is stable, and the shift register can send out a high level signal to control the switch K to close when the crystal clock CLK rises, so as to reduce the equivalent resistance of the adjustable resistance unit 2.
Specifically, as shown in fig. 5, the shaping circuit includes:
a low-pass filter 31 connected to an input terminal of the inverter inv;
and a comparator 32 having a non-inverting input terminal connected to the output terminal of the low-pass filter 31, an inverting input terminal connected to the input terminal of the inverter inv, and an output terminal serving as the output terminal of the shaping circuit.
It will be understood that the input signal of the inverter inv will output a stable sinusoidal signal only when entering a stable oscillation phase, and the low-pass filter 31 will output a stable dc signal, and the stable dc signal and the sinusoidal signal pass through the comparator 32, and the comparator 32 will output the crystal clock CLK with a duty ratio of 50%.
Specifically, referring to fig. 6, the shift register includes a plurality of D flip-flops 33 connected in sequence, where:
the D input end of the first D flip-flop 33 is connected to a power supply VDD, and the D input ends of the remaining D flip-flops 33 are connected to the Q output end of the previous D flip-flop 33;
the clock input of each D flip-flop 33 is connected to the output of the shaping circuit.
Further, when the adjustable resistance unit 2 includes a plurality of switches K, the output ends of the plurality of action triggers are connected with the control ends of the plurality of switches K one by one, and when the action triggers output a high level, the corresponding switches K are closed;
the plurality of action triggers are specifically: a plurality of D flip-flops 33 including a last D flip-flop 33.
Similarly, when the adjustable resistance unit 2 includes a switch K, the output terminal of the last D flip-flop 33 is connected to the control terminal of the switch K, and when the D flip-flop 33 outputs a high level, the switch K is closed.
It can be understood that, if the adjustable resistance unit 2 includes a plurality of switches K, the switches can be controlled to be closed step by step, so as to reduce the negative influence on the crystal oscillator model caused by the jump of the adjustable resistance unit 2. Therefore, the wiring of the plurality of D flip-flops 33 and the switches K in the shift register can be set according to specific requirements, including two setting schemes that each D flip-flop 33 controls one switch K, and the last D flip-flop 33 controls all the switches K to be closed simultaneously.
It can be understood that the control effect of the motion trigger on the adjustable resistance unit 2 is based on the specific circuit of the adjustable resistance unit 2, and the specific circuit of the adjustable resistance unit 2 may include other parallel or cascade connection modes and other switch on/off states besides the series connection mode, but all need to follow the control principle of the controller 3 on the adjustable resistance unit 2, that is, when in the oscillation starting stage, the equivalent resistance value of the adjustable resistance unit 2 is controlled to be the maximum resistance value; when in the oscillation stage, the equivalent resistance value of the adjustable resistance unit 2 is controlled to be the minimum resistance value, so that the requirement of quick oscillation starting is met, the oscillation amplitude is not increased, and the service life of the quick oscillation starting crystal oscillator driving circuit is not damaged.
Correspondingly, the embodiment of the present application further discloses an integrated circuit, including: the rapid oscillation starting crystal oscillator driving circuit as described in any one of the above.
The details of the fast oscillation starting crystal oscillator driving circuit may refer to the description in the above embodiments, and are not repeated herein.
The integrated circuit in this embodiment has the same beneficial effects as the fast oscillation starting crystal oscillator driving circuit in the above embodiments, and details are not repeated here.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above detailed description is provided for the fast oscillation starting crystal oscillator driving circuit and the integrated circuit, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A fast start-up crystal oscillator driving circuit, comprising:
the first series unit comprises a first resistor, a first inductor and a first capacitor;
the second capacitor, the adjustable resistance unit and the inverter are connected with the first series unit in parallel;
the first grounding capacitor is connected with the input end of the phase inverter;
the second grounding capacitor is connected with the output end of the phase inverter;
and the controller controls the equivalent resistance value of the adjustable resistance unit according to the input end signal of the phase inverter.
2. The fast start-up crystal oscillator drive circuit of claim 1, wherein the controller is configured to:
judging the circuit state of the rapid oscillation starting crystal oscillator driving circuit to be an oscillation starting stage or an oscillation stage according to the input end signal of the phase inverter;
when the oscillation starting stage is carried out, the equivalent resistance value of the adjustable resistance unit is controlled to be the maximum resistance value;
and when in the oscillation stage, controlling the equivalent resistance value of the adjustable resistance unit to be the minimum resistance value.
3. The fast oscillation starting crystal oscillator driving circuit according to claim 2, wherein the controller is specifically configured to:
and gradually controlling the equivalent resistance value of the adjustable resistance unit to be reduced from the maximum resistance value to the minimum resistance value in the oscillation stage.
4. The fast start-up crystal oscillator driving circuit according to claim 2, wherein the adjustable resistance unit comprises a second resistor, one or more third resistors, and one or more switches, wherein:
the second resistor is connected with all the third resistors in series;
each third resistor is connected with one switch in parallel.
5. The fast start-up crystal oscillator drive circuit of claim 4, wherein the controller comprises:
the input end of the shaping circuit is connected with the input end of the phase inverter and outputs the crystal oscillator clock when the oscillation signal is stable;
the signal input end is connected with a power supply, the clock input end is connected with the output end of the shaping circuit, and the output end of the shift register controls the closed states of the switches.
6. The crystal oscillator drive circuit of claim 5, wherein the shift register comprises a plurality of sequentially connected D flip-flops, wherein:
the D input end of the first D trigger is connected with the power supply, and the D input ends of the other D triggers are connected with the Q output end of the previous D trigger;
and the clock input end of each D flip-flop is connected with the output end of the shaping circuit.
7. The crystal oscillator drive circuit of claim 6,
when the adjustable resistance unit comprises a plurality of switches, the output ends of a plurality of action triggers are connected with the control ends of the switches one by one, and when the action triggers output high level, the corresponding switches are closed;
the plurality of action triggers are specifically: a plurality of said D flip-flops including a last said D flip-flop.
8. The crystal oscillator drive circuit of claim 6,
when the adjustable resistance unit comprises one switch, the output end of the last D trigger is connected with the control end of the switch, and when the D trigger outputs a high level, the switch is closed.
9. The crystal oscillator drive circuit according to any one of claims 5 to 8, wherein the shaping circuit comprises:
a low pass filter connected to an input of the inverter;
and the non-inverting input end of the comparator is connected with the output end of the low-pass filter, the inverting input end of the comparator is connected with the input end of the phase inverter, and the output end of the comparator is used as the output end of the shaping circuit.
10. An integrated circuit, comprising:
the rapid oscillation starting crystal oscillator drive circuit according to any one of claims 1 to 9.
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| CN202011622436.6A CN112787661A (en) | 2020-12-30 | 2020-12-30 | Quick-oscillation-starting crystal oscillator driving circuit and integrated circuit |
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| CN202011622436.6A CN112787661A (en) | 2020-12-30 | 2020-12-30 | Quick-oscillation-starting crystal oscillator driving circuit and integrated circuit |
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| CN106100633A (en) * | 2016-08-11 | 2016-11-09 | 北京兆易创新科技股份有限公司 | A kind of crystal oscillator drive circuit |
| CN106559038A (en) * | 2016-11-21 | 2017-04-05 | 灿芯半导体(上海)有限公司 | Crystal oscillating circuit |
| KR101834860B1 (en) * | 2016-10-17 | 2018-03-06 | (주)인투칩스 | Low current crystal oscillator having fast start-up |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001257534A (en) * | 2000-03-09 | 2001-09-21 | Asahi Kasei Microsystems Kk | Crystal oscillator |
| US20080211593A1 (en) * | 2007-02-17 | 2008-09-04 | Yutaka Sato | Oscillation circuit |
| CN101828332A (en) * | 2007-07-23 | 2010-09-08 | 模拟设备股份有限公司 | Crystal Oscillator with Variable Gain and Variable Output Impedance Inverter System |
| JP2009284335A (en) * | 2008-05-23 | 2009-12-03 | Nippon Telegr & Teleph Corp <Ntt> | Oscillation circuit |
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