CN106788261B - A kind of high precision oscillator - Google Patents
A kind of high precision oscillator Download PDFInfo
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- CN106788261B CN106788261B CN201710026063.8A CN201710026063A CN106788261B CN 106788261 B CN106788261 B CN 106788261B CN 201710026063 A CN201710026063 A CN 201710026063A CN 106788261 B CN106788261 B CN 106788261B
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- 230000010355 oscillation Effects 0.000 claims abstract description 42
- 238000007599 discharging Methods 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 230000005669 field effect Effects 0.000 claims description 201
- 230000000694 effects Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
The present invention relates to circuit design field more particularly to a kind of high precision oscillators.The high precision oscillator includes: the first current source circuit, the second current source circuit and oscillating circuit；The oscillating circuit includes charging/discharging voltage difference generation circuit, charging current source, discharge current source, oscillation circuit and capacitor；The charging/discharging voltage difference generation circuit is electrically connected with charging current source, discharge current source, oscillation circuit and capacitor respectively；First current source circuit is electrically connected with charging/discharging voltage difference generation circuit；Second current source circuit is electrically connected by charging current source with oscillation circuit, and second current source circuit is electrically connected by discharge current source with oscillation circuit.Traditional oscillating structure is replaced by the oscillating circuit being made of charging/discharging voltage difference generation circuit, charging current source, discharge current source, oscillation circuit and capacitor, keeps final frequency unrelated with resistance technique, and then improve the output accuracy of oscillator.
Description
Technical field
The present invention relates to circuit design field more particularly to a kind of high precision oscillators.
Background technique
In the design of card class chip (such as contact type intelligent card), a more accurate clock signal is needed, still
It outer can not add crystal oscillator in the application of card class chip and obtain one very with phaselocked loop (phase-lockedloop, pll)
Accurate clock, so just becoming its inevitable choice using oscillator.
It is well known that the output clock frequency of oscillator will receive the influence of technique, supply voltage and temperature,
The output clock frequency error of oscillator will be made very big when above-mentioned each factor changes, the output clock of general oscillator
Frequency error can reach 20%~30% with technique, supply voltage and temperature change, or even reach 50% unexpectedly sometimes, this
Very big puzzlement is brought to circuit design, is unable to satisfy the normal work demand of circuit.
Most of oscillating structures using RC charge and discharge system or constant current charge-discharge mode in the prior art.As shown in Figure 1,
Its frequency of oscillation is influenced by time constant RC；As shown in Fig. 2, its frequency of oscillation is mainly influenced by charging and discharging currents Ip and In,
And the precision of Ip and In is often influenced by the technique of resistance.Since the process deviation of resistance is larger, it is affected by temperature big, current source
Precision be difficult to improve, although can be improved by self calibration or the method trimmed, cost can be greatly increased.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of high precision oscillator.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of high precision oscillator, comprising: the first current source circuit, the second current source circuit and oscillating circuit；
The oscillating circuit include charging/discharging voltage difference generation circuit, charging current source, discharge current source, oscillation circuit and
Capacitor；The charging/discharging voltage difference generation circuit is electrically connected with charging current source, discharge current source, oscillation circuit and capacitor respectively
It connects；First current source circuit is electrically connected with charging/discharging voltage difference generation circuit；
Second current source circuit is electrically connected by charging current source with oscillation circuit, and second current source circuit is logical
Overdischarge current source is electrically connected with oscillation circuit.
The beneficial effects of the present invention are:
High precision oscillator provided by the invention is by by charging/discharging voltage difference generation circuit, charging current source, electric discharge
The oscillating circuit of current source, oscillation circuit and capacitor composition replaces traditional RC charge and discharge oscillating structure or constant current charge-discharge side
The oscillating structure of formula is respectively acting on charging and discharging currents and capacitor using two kinds of current sources different by Resistance Influence degree
In voltage difference, a frequency of oscillation unrelated with resistance technique is produced, therefore solves traditional RC charge and discharge oscillating structure
Or due to the output accuracy of resistance process deviation influence oscillator on the oscillating structure of constant current charge-discharge mode, and then improve vibration
Swing the output accuracy of device.
Detailed description of the invention
Fig. 1 is the circuit connection diagram of RC charge and discharge system in background of invention；
Fig. 2 is the circuit connection diagram of constant current charge-discharge mode in background of invention；
Fig. 3 is the module connection diagram of high precision oscillator of the invention；
Fig. 4 is the first current source circuit connection schematic diagram of high precision oscillator of the invention；
Fig. 5 is the second current source circuit connection schematic diagram of high precision oscillator of the invention；
Fig. 6 is the specific implementation connection schematic diagram of high precision oscillator of the invention；
Label declaration:
1, the first current source circuit；2, the second current source circuit；3, oscillating circuit；31, charging/discharging voltage difference generation circuit；
32, charging current source；33, discharge current source；34, oscillation circuit；35, capacitor.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
The most critical design of the present invention is: by charging/discharging voltage difference generation circuit, charging current source, discharge current source,
The oscillating circuit of oscillation circuit and capacitor composition replaces the vibration of traditional RC charge and discharge oscillating structure or constant current charge-discharge mode
Structure is swung, eliminating resistance technique influences.
Referring to figure 3. -6, a kind of high precision oscillator provided by the invention, comprising: first the 1, second electricity of current source circuit
Current source circuit 2 and oscillating circuit 3；
The oscillating circuit 3 includes charging/discharging voltage difference generation circuit 31, charging current source 32, discharge current source 33, vibration
Swing circuit 34 and capacitor 35；The charging/discharging voltage difference generation circuit 31 respectively with charging current source 32, discharge current source 33, vibration
It swings circuit 34 and capacitor 35 is electrically connected；
First current source circuit 1 is electrically connected with charging/discharging voltage difference generation circuit 31；
Second current source circuit 2 is electrically connected by charging current source 32 with oscillation circuit 34, second current source
Circuit 2 is electrically connected by discharge current source 33 with oscillation circuit 34.
High precision oscillator provided by the invention is by by charging/discharging voltage difference generation circuit, charging current source, electric discharge
The oscillating circuit of current source, oscillation circuit and capacitor composition replaces traditional RC charge and discharge oscillating structure or constant current charge-discharge side
The oscillating structure of formula is respectively acting on charging and discharging currents and capacitor using two kinds of current sources different by Resistance Influence degree
In voltage difference, a frequency of oscillation unrelated with resistance technique is produced, therefore solves traditional RC charge and discharge oscillating structure
Or due to the output accuracy of resistance process deviation influence oscillator on the oscillating structure of constant current charge-discharge mode, and then improve vibration
Swing the output accuracy of device.
Further, the charging/discharging voltage difference generation circuit include the first field-effect tube MN1, the second field-effect tube MN2,
Third field-effect tube MN5 and resistance R3；
The grid of the first field-effect tube MN1 is electrically connected with the grid of the second field-effect tube MN2, first field-effect
The source electrode of pipe MN1 is grounded after being electrically connected with the source electrode of the second field-effect tube MN2, the drain electrode difference of the first field-effect tube MN1
It is electrically connected with one end of the drain electrode of third field-effect tube MN5 and resistance R3, another termination power of the resistance R3, described second
The drain electrode of field-effect tube MN2 is electrically connected with the source electrode of third field-effect tube MN5, the grid of the third field-effect tube MN5 and vibration
Swing circuit electrical connection.
Further, first current source circuit includes the 4th field-effect tube MP3, the 5th field-effect tube MP4, the 6th
Effect pipe MN6, the 7th field-effect tube MN7 and first resistor R1；
The drain electrode of the 4th field-effect tube MP3 connects power supply, the grid of the 4th field-effect tube MP3 respectively with the 5th
The drain electrode of the grid of effect pipe MP4, the source electrode of the 4th field-effect tube MP3 and the 6th field-effect tube is electrically connected；
The 5th field-effect tube MP4 connects power supply by first resistor, the source electrode of the 5th field-effect tube MP4 respectively with
The drain electrode of the grid of 6th field-effect tube, the grid of the 7th field-effect tube and the 7th field-effect tube is electrically connected, the 5th effect
Should the source electrode of pipe MP4 be electrically connected with the grid of the first field-effect tube；
It is grounded after the source electrode of 6th field-effect tube and the source electrode electrical connection of the 7th field-effect tube.
Further, the charging current source includes the 8th field-effect tube MP1；The discharge current source includes the 9th effect
It should pipe MN3；Second current source circuit includes first comparator COM2, the tenth field-effect tube MP5, the 11st field-effect tube
MP6, the 12nd field-effect tube MN8, the 13rd field-effect tube MN9 and second resistance R2；The first comparator includes first just
To input terminal, the first reverse input end and the first output end；
First positive input is electrically connected with the reference voltage circuit of peripheral hardware；
First output end is electrically connected with the grid of the 12nd field-effect tube, the drain electrode point of the 12nd field-effect tube
It is not electrically connected with the source electrode of the tenth field-effect tube, the grid of the tenth field-effect tube and the grid of the 11st field-effect tube, described
The drain electrode of 12 field-effect tube is electrically connected with the grid of the 8th field-effect tube, and the drain electrode of the 8th field-effect tube connects power supply, institute
The source electrode for stating the 8th field-effect tube is electrically connected with oscillation circuit, drain electrode and the 11st field-effect tube of the tenth field-effect tube
Drain electrode electrical connection is followed by power supply, the source electrode drain electrode and the 13rd with the 13rd field-effect tube respectively of the 11st field-effect tube
The grid of field-effect tube is electrically connected, and the source electrode of the 11st field-effect tube is electrically connected with the grid of the 9th field-effect tube, described
The drain electrode of 9th field-effect tube is electrically connected with oscillation circuit, the source electrode ground connection of the 9th field-effect tube, the 13rd effect
Should pipe source electrode ground connection；
First reverse input end is electrically connected with one end of the source electrode of the 12nd field-effect tube and second resistance respectively, institute
State the other end ground connection of second resistance.
Further, the oscillation circuit compares including the 14th field-effect tube MP2, the 15th field-effect tube MN4, second
Device CMP and phase inverter INV；Second comparator includes the second positive input, the second reverse input end and second output terminal；
The drain electrode of 14th field-effect tube is electrically connected with the source electrode of the 8th field-effect tube, the 14th field-effect tube
Source electrode be electrically connected respectively with one end of the drain electrode of the 15th field-effect tube, the second reverse input end and capacitor, the capacitor
Other end ground connection, grid and the grid of third field-effect tube, the grid of the 15th field-effect tube of the 14th field-effect tube
It is electrically connected with the output end of phase inverter；
The source electrode of 15th field-effect tube is electrically connected with the drain electrode of the 9th field-effect tube, the input terminal of the phase inverter
It is electrically connected with second output terminal；Second positive input is electrically connected with the drain electrode of third field-effect tube.
Referring to figure 3. -6, the embodiment of the present invention one are as follows:
A kind of high precision oscillator provided by the invention can eliminate the influence of resistance technique, use two kinds by resistance shadow
The different current source (the first current source circuit and the second current source circuit) of the degree of sound, forms vibration using constant current charge-discharge mode
Circuit is swung, the resistance used is same type.Two kinds of current sources be respectively with square current source A being inversely proportional of resistance and with
The current source B that resistance is inversely proportional.
Charging/discharging voltage difference △ V in oscillating circuit is controlled current source A by a switch by the control of current source A
Whether resistance offer electric current is given, then forms the voltage of two different sizes on resistance, the difference of two voltages is charge and discharge
Voltage difference △ V, finally obtained charging/discharging voltage difference are inversely proportional with resistance；
Charging and discharging currents in oscillating circuit are inversely proportional by the control of current source B with resistance.
By Q=C* △ V=I*T it is found that the frequency of oscillation (or period) of oscillator is a value unrelated with resistance technique.
A kind of oscillator provided by the invention, including current source A circuit (as the first current source circuit), current source B electricity
Road (as the second current source circuit), oscillating circuit；
First current source circuit includes the 4th field-effect tube, the 5th field-effect tube, the 6th field-effect tube, the 7th effect
It should manage and first resistor；The drain electrode of 4th field-effect tube connects power supply, and the grid of the 4th field-effect tube is respectively with the 5th
The drain electrode of the grid of field-effect tube, the source electrode of the 4th field-effect tube and the 6th field-effect tube is electrically connected；5th field-effect tube
Connect power supply by first resistor, the source electrode of the 5th field-effect tube respectively with the grid of the 6th field-effect tube, the 7th field-effect
The drain electrode of the grid of pipe and the 7th field-effect tube is electrically connected, the source electrode of the 5th field-effect tube and the grid of the first field-effect tube
Electrical connection；It is grounded after the source electrode of 6th field-effect tube and the source electrode electrical connection of the 7th field-effect tube.
The first above-mentioned current source circuit is current source A circuit as shown in figure 4, using perseverance gm reference current structure, electricity
It flows and square to be inversely proportional with resistance；Wherein the 4th field-effect tube, the 5th field-effect tube, the 6th field-effect tube, the 7th field-effect tube
With first resistor R1.Wherein electric current IAExpression formula it is as follows:
By above-mentioned electric current IAExpression formula it is found that its electric current and resistance R1's square is inversely proportional；
Second current source circuit includes first comparator, the tenth field-effect tube, the 11st field-effect tube, the 12nd
Effect pipe, the 13rd field-effect tube and second resistance R2；The first comparator includes the first positive input, first reversed defeated
Enter end and the first output end；First positive input is electrically connected with the reference voltage circuit Vref of peripheral hardware；Described first is defeated
Outlet is electrically connected with the grid of the 12nd field-effect tube, the 12nd field-effect tube drain electrode respectively with the tenth field-effect tube
The grid of source electrode, the grid of the tenth field-effect tube and the 11st field-effect tube is electrically connected, the drain electrode of the 12nd field-effect tube
It is electrically connected with the grid of the 8th field-effect tube, the drain electrode of the 8th field-effect tube connects power supply, the source of the 8th field-effect tube
Pole is electrically connected with oscillation circuit, and the drain electrode of the tenth field-effect tube is electrically connected with the drain electrode of the 11st field-effect tube is followed by electricity
Source, the source electrode of the 11st field-effect tube are electric with the grid of the drain electrode of the 13rd field-effect tube and the 13rd field-effect tube respectively
Connection, the source electrode of the 11st field-effect tube are electrically connected with the grid of the 9th field-effect tube, the leakage of the 9th field-effect tube
Pole is electrically connected with oscillation circuit, the source electrode ground connection of the 9th field-effect tube, the source electrode ground connection of the 13rd field-effect tube；Institute
It states the first reverse input end to be electrically connected with one end of the source electrode of the 12nd field-effect tube and second resistance respectively, the second resistance
The other end ground connection.
The second above-mentioned current source circuit be current source B circuit as shown in figure 5, using reference voltage generate with resistance at
The electric current of inverse ratio；Reference current I is wherein generated using reference voltageBExpression formula it is as follows:
By above-mentioned electric current IBExpression formula it is found that its electric current is inversely proportional with resistance R2.
The oscillating circuit is as shown in fig. 6, including charging/discharging voltage difference generation circuit, charging and discharging currents source and vibrating back
Road.
The charging/discharging voltage difference generation circuit includes the first field-effect tube MN1, the second field-effect tube MN2, third field effect
It should pipe MN5 and resistance R3；The grid of first field-effect tube is electrically connected with the grid of the second field-effect tube, first effect
Should pipe source electrode be electrically connected with the source electrode of the second field-effect tube after be grounded, the drain electrode of first field-effect tube respectively with third field
The drain electrode of effect pipe and one end electrical connection of resistance, another termination power of the resistance, the drain electrode of second field-effect tube
It is electrically connected with the source electrode of third field-effect tube, the grid of the third field-effect tube is electrically connected with oscillation circuit.The charging electricity
Stream source includes the 8th field-effect tube MP1；The discharge current source includes the 9th field-effect tube MN3.
Wherein the 8th field-effect tube MP1 and the 9th field-effect tube MN3 is obtained by second current source circuit (current source B) mirror image
It arrives, is inversely proportional with resistance.First field-effect tube MN1 and the second field-effect tube MN2 are obtained by current source A mirror image, flat with resistance
Side is inversely proportional.Two different electrical voltage points finally are obtained at the second positive input A point of the second comparator, as capacitor C
The upper limit and lower voltage limit, obtain the capacitor charge and discharge voltage difference being inversely proportional with resistance.
The oscillation circuit includes the 14th field-effect tube MP2, the 15th field-effect tube MN4, the second comparator CMP and anti-
Phase device INV；Second comparator includes the second positive input A, the second reverse input end B and second output terminal；
The drain electrode of 14th field-effect tube is electrically connected with the source electrode of the 8th field-effect tube, the 14th field-effect tube
Source electrode be electrically connected respectively with one end of the drain electrode of the 15th field-effect tube, the second reverse input end and capacitor, the capacitor
Other end ground connection, grid and the grid of third field-effect tube, the grid of the 15th field-effect tube of the 14th field-effect tube
It is electrically connected with the output end of phase inverter；The source electrode of 15th field-effect tube is electrically connected with the drain electrode of the 9th field-effect tube, institute
The input terminal for stating phase inverter is electrically connected with second output terminal；Second positive input and the drain electrode of third field-effect tube are electrically connected
It connects.
The capacitance voltage difference generation circuit is made of two current sources, a switch and a resistance.Current source I1 and
Current source I2 is obtained by current source A mirror image.Current source I1 and resistance R3 forms access, and current source I2 is controlled by switching tube MN5 is
No to form access with R3, then the electric current for flowing through R3 is I1 or (I1+I2), so the voltage of A point are as follows:
VA=VDD-R3*I1 or VA=VDD-R3* (I1+I2)；
Wherein VA=VDD-R3*I1 will be as the ceiling voltage V to charge on capacitorH, VA=VDD-R3* (I1+I2) is by conduct
The minimum voltage V to discharge on capacitorL, i.e., in oscillatory process, the expression formula of the pressure difference △ VB on capacitor is as follows:
Wherein k2 is electric current I2 and current source A electric current IAMultiple；
The charge and discharge constant-current source is provided by current source B, i.e. charging and discharging currents are as follows:
Wherein k1 is expressed as charging and discharging currents and current source B electric current IBMultiple.
The oscillation circuit is by comparator, the oscillation circuit of inverter controlling.Work as VA>VBWhen, the high electricity of comparator output
It is flat, the shutdown of MN5 and MN4 pipe, the conducting of MP2 pipe.V at this timeAOn voltage be ceiling voltage VH, capacitor is by constant current source charging, VBElectricity
Pressure gradually rises；As the voltage V on capacitorBIt is increased to slightly larger than VHWhen, comparator exports low level, MN5 and MN4 pipe is connected,
MP2 pipe turns off, at this time VAOn voltage be minimum voltage VL, capacitor starts to discharge, VBVoltage gradually decreases；When the electricity on capacitor
Press VBIt is reduced to and is slightly less than VLWhen, comparator output becomes high level again again, acts before repeating, forms oscillating circuit.If be related to
Charging and discharging currents it is identical, then the expression formula of frequency of oscillation f is as follows:
Preferably, if resistance R1, R2, R3 are using same type of resistance, the expression formula of frequency of oscillation f can letter
It turns to:
WhereinIt is a constant unrelated with resistance technique.
The oscillator provided through the invention, from the parameter and resistance obtained known to above-mentioned frequency of oscillation in expression formula
Resistance value is unrelated, therefore unrelated with the technique of resistance, to solve traditional RC charge and discharge oscillating structure or constant current charge-discharge
Due to the output accuracy of resistance process deviation influence oscillator on the oscillating structure of mode, and then improve the output essence of oscillator
Degree.
In conclusion a kind of high precision oscillator provided by the invention be by by charging/discharging voltage difference generation circuit, fill
Electric current source, discharge current source, oscillation circuit and capacitor composition oscillating circuit replace traditional RC charge and discharge oscillating structure or
The oscillating structure of person's constant current charge-discharge mode, the final frequency made is unrelated with resistance technique, therefore solves traditional RC
Due to the output of resistance process deviation influence oscillator on charge and discharge oscillating structure or the oscillating structure of constant current charge-discharge mode
Precision, and then improve the output accuracy of oscillator.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (4)
1. a kind of high precision oscillator characterized by comprising the first current source circuit, the second current source circuit and oscillation electricity
Road；
The oscillating circuit includes charging/discharging voltage difference generation circuit, charging current source, discharge current source, oscillation circuit and electricity
Hold；The charging/discharging voltage difference generation circuit is electrically connected with charging current source, discharge current source, oscillation circuit and capacitor respectively；
First current source circuit is electrically connected with charging/discharging voltage difference generation circuit；
Second current source circuit is electrically connected by charging current source with oscillation circuit, and second current source circuit is by putting
Electric current source is electrically connected with oscillation circuit；
The charging/discharging voltage difference generation circuit includes the first field-effect tube, the second field-effect tube, third field-effect tube and resistance；
The grid of first field-effect tube is electrically connected with the grid of the second field-effect tube, the source electrode of first field-effect tube with
It is grounded after the source electrode electrical connection of second field-effect tube, the drain electrode drain electrode with third field-effect tube respectively of first field-effect tube
It is electrically connected with one end of resistance, another termination power of the resistance, the drain electrode and third field-effect of second field-effect tube
The source electrode of pipe is electrically connected, and the grid of the third field-effect tube is electrically connected with oscillation circuit.
2. high precision oscillator according to claim 1, which is characterized in that first current source circuit includes the 4th
Effect pipe, the 5th field-effect tube, the 6th field-effect tube, the 7th field-effect tube and first resistor；
The drain electrode of 4th field-effect tube connects power supply, the grid of the 4th field-effect tube grid with the 5th field-effect tube respectively
The drain electrode of pole, the source electrode of the 4th field-effect tube and the 6th field-effect tube is electrically connected；
5th field-effect tube connects power supply by first resistor, the source electrode of the 5th field-effect tube respectively with the 6th field-effect
The drain electrode of the grid of pipe, the grid of the 7th field-effect tube and the 7th field-effect tube is electrically connected, the source electrode of the 5th field-effect tube
It is electrically connected with the grid of the first field-effect tube；
It is grounded after the source electrode of 6th field-effect tube and the source electrode electrical connection of the 7th field-effect tube.
3. high precision oscillator according to claim 1, which is characterized in that the charging current source includes the 8th field-effect
Pipe；The discharge current source includes the 9th field-effect tube；Second current source circuit includes first comparator, the tenth field-effect
Pipe, the 11st field-effect tube, the 12nd field-effect tube, the 13rd field-effect tube and second resistance；The first comparator includes
First positive input, the first reverse input end and the first output end；
First positive input is electrically connected with the reference voltage circuit of peripheral hardware；
First output end is electrically connected with the grid of the 12nd field-effect tube, the drain electrode of the 12nd field-effect tube respectively with
The grid of the source electrode of tenth field-effect tube, the grid of the tenth field-effect tube and the 11st field-effect tube is electrically connected, and the described 12nd
The drain electrode of field-effect tube is electrically connected with the grid of the 8th field-effect tube, and the drain electrode of the 8th field-effect tube connects power supply, and described
The source electrode of eight field-effect tube is electrically connected with oscillation circuit, the drain electrode and the drain electrode of the 11st field-effect tube of the tenth field-effect tube
Electrical connection is followed by power supply, and the source electrode of the 11st field-effect tube is imitated with the drain electrode of the 13rd field-effect tube and the 13rd respectively
Should pipe grid electrical connection, the source electrode of the 11st field-effect tube is electrically connected with the grid of the 9th field-effect tube, the described 9th
The drain electrode of field-effect tube is electrically connected with oscillation circuit, the source electrode ground connection of the 9th field-effect tube, the 13rd field-effect tube
Source electrode ground connection；
First reverse input end is electrically connected with one end of the source electrode of the 12nd field-effect tube and second resistance respectively, and described
The other end of two resistance is grounded.
4. high precision oscillator according to claim 3, which is characterized in that the oscillation circuit includes the 14th field-effect
Pipe, the 15th field-effect tube, the second comparator and phase inverter；Second comparator includes the second positive input, second anti-
To input terminal and second output terminal；
The drain electrode of 14th field-effect tube is electrically connected with the source electrode of the 8th field-effect tube, the source of the 14th field-effect tube
Pole is electrically connected with one end of the drain electrode of the 15th field-effect tube, the second reverse input end and capacitor respectively, the capacitor it is another
The grid of end ground connection, the grid of the 14th field-effect tube and third field-effect tube, the grid of the 15th field-effect tube and anti-
The output end of phase device is electrically connected；
The source electrode of 15th field-effect tube is electrically connected with the drain electrode of the 9th field-effect tube, the input terminal of the phase inverter and
The electrical connection of two output ends；Second positive input is electrically connected with the drain electrode of third field-effect tube.
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| CN201710026063.8A CN106788261B (en) | 2017-01-13 | 2017-01-13 | A kind of high precision oscillator |
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| CN201710026063.8A CN106788261B (en) | 2017-01-13 | 2017-01-13 | A kind of high precision oscillator |
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| CN106788261B true CN106788261B (en) | 2019-09-20 |
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| CN109495088A (en) * | 2018-12-28 | 2019-03-19 | 北京集创北方科技股份有限公司 | RC oscillating circuit and RC oscillator device |
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| CN102035489A (en) * | 2010-12-31 | 2011-04-27 | 苏州华芯微电子股份有限公司 | RC oscillator circuit for eliminating temperature influence and voltage influence |
| CN102931913A (en) * | 2012-10-31 | 2013-02-13 | 珠海市杰理科技有限公司 | High-precision oscillator |
| CN105897168A (en) * | 2016-04-18 | 2016-08-24 | 四川和芯微电子股份有限公司 | Rc oscillator |
-
2017
- 2017-01-13 CN CN201710026063.8A patent/CN106788261B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7598822B2 (en) * | 2005-04-07 | 2009-10-06 | Texas Instruments Incorporated | Process, supply, and temperature insensitive integrated time reference circuit |
| CN102035489A (en) * | 2010-12-31 | 2011-04-27 | 苏州华芯微电子股份有限公司 | RC oscillator circuit for eliminating temperature influence and voltage influence |
| CN102931913A (en) * | 2012-10-31 | 2013-02-13 | 珠海市杰理科技有限公司 | High-precision oscillator |
| CN105897168A (en) * | 2016-04-18 | 2016-08-24 | 四川和芯微电子股份有限公司 | Rc oscillator |
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| CN106788261A (en) | 2017-05-31 |
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