CN108521268A - A kind of crystal oscillator of fast start-up, electronic system and method - Google Patents
A kind of crystal oscillator of fast start-up, electronic system and method Download PDFInfo
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- CN108521268A CN108521268A CN201810177583.3A CN201810177583A CN108521268A CN 108521268 A CN108521268 A CN 108521268A CN 201810177583 A CN201810177583 A CN 201810177583A CN 108521268 A CN108521268 A CN 108521268A
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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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1228—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more field effect transistors
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Abstract
The invention discloses a kind of crystal oscillator of fast start-up, electronic system and method, which includes：Operational transconductance amplifier is amplified for the voltage signal to Differential Input, and generates positive controlled current flow and negative sense controlled current flow；First controlled current flow output module, one end of the differential input end for the positive controlled current flow and negative sense controlled current flow to be mirrored to operational transconductance amplifier simultaneously, forms positive feedback signal；Second controlled current flow output module, the other end of the differential input end for the positive controlled current flow and negative sense controlled current flow to be mirrored to operational transconductance amplifier simultaneously, forms negative-feedback signal；The second capacitance of oscillation is followed for generating oscillation crystal oscillator unit and for generating.The present invention is offset the capacitance factor that negative resistance improves is limited in traditional crystal oscillator by the way of image current, can effectively be accelerated the starting of oscillation speed of crystal oscillator.The present invention can be widely applied to oscillator technique field.
Description
Technical field
The present invention relates to oscillator technique, especially a kind of crystal oscillator of fast start-up, electronic system and method.
Background technology
Quartz oscillator is widely applied in modern electronic product, it provides clock and the simulation of digital circuit
The reference frequency of circuit.Pierce circuit is usually formed by electronic device, then crystal oscillator is constituted with external quartz crystal.
Wherein crystal drives pierce circuit to be operated in a very narrow frequency because having very high quality factor (Q values)
In range, i.e., circuit reaches resonant condition, thus provides clock and frequency signal more accurate and stablize.
The Induction Peried of existing crystal oscillator usually all in Millisecond, is needing frequent start-stop and is only needing in short-term
In the system of work, crystal oscillator starting of oscillation occupies very greatly to the occupied time is stablized in whole system working time section
Ratio, consume the power consumption of larger proportion, increasingly becoming modern Low Power Electronic System reduces the obstacle of power consumption.With logical
The progress for believing the raising and calculating speed of rate, the working time for really needing processing information and transmission data constantly contract
Subtract, much needs the system of continuous operation that short-term operation, the method for long-time suspend mode is all used to improve efficiency, allowed to the greatest extent in rest period
Circuit module more than possible is stopped and power consumption.Since crystal oscillator Induction Peried is long, in the system for needing quick response
In tend not to crystal-oscillator circuit being included in thorough suspend mode range, caused by crystal oscillation and interlock circuit can only be endured
Otherwise power consumption will make a concession in system data rates or response speed etc..In short, how to improve crystal oscillator
Starting of oscillation speed becomes the key of current Low Power Electronic System.
The core of crystal oscillator is positive-feedback circuit, and meeting certain amplitude and phase condition could work.It is humorous
When shaking, crystal works between series resonance frequency and parallel resonance frequency, shows as a prodigious inductance of inductance value.Its remained shock
Swing the series connection that circuit shows as a negative resistance and a load capacitance, crystal equivalent inductance and load capacitance shape at hope frequency
At series resonance, and negative resistance provides enough energy starting of oscillations and maintains the energy loss in crystal and circuit.Common crystal shakes
It swings device and mainly uses Pierre's Si structure or the bikini oscillator structure of its variant, as shown in Figure 1.Fig. 1 is crystal oscillation
Device circuit, wherein crystal are equivalent at RLC series connection (i.e. equivalent resistance Rm, equivalent capacity Cm and equivalent inductance Lm), then with parasitism
Capacitance Cp is in parallel.Amplifier section in oscillating circuit must provide enough positive and negative feedforward gains, could guide circuit finally into
Enter stable oscillating operation condition.
Fig. 2 shows the case where equiva lent impedance of oscillating circuit changes with amplifier gain gm, when gm is minimized 0 or most
When big value ∞, impedance real part is all 0, when optimal value gmopt is got in centre, negative resistance acquirement maximum value, and the maximum value by
The restriction of parasitic capacitance Cp in parallel.Parasitic capacitance Cp includes crystal package capacitance, amplifier grid electricity in actual circuit
Hold, the parasitic capacitance etc. on IC chip pin parasitic capacitance and PCB circuits, these capacitances can not be ignored, and actually add
2~5pF may be up to.
Therefore other than the RLC series arms in crystal equivalent circuit all parallel connections parasitic capacitance, positive feedback shape can be limited
At maximum negative resistance absolute value so that more than continuing to increase positive and negative feedforward gain after a certain critical point, to reduce negative resistance instead absolute
Value, therefore limit the effect for increasing positive and negative feedforward gain to accelerating starting of oscillation.Therefore need a kind of technical solution in parallel electric to reduce
Hold, completes to realize fast start-up while crystal oscillation function to realize.
Invention content
In order to solve the above technical problems, it is an object of the invention to：Shunt capacitance can be reduced to realize by providing one kind
Crystal oscillator, electronic system and the method for fast start-up.
The first technical solution for being taken of the present invention is：
A kind of crystal oscillator of fast start-up, including：
Operational transconductance amplifier is amplified for the voltage signal to Differential Input, and generate positive controlled current flow and
Negative sense controlled current flow；
First controlled current flow output module, for by the positive controlled current flow and negative sense controlled current flow be mirrored to simultaneously across
One end of the differential input end of operational amplifier is led, positive feedback signal is formed；
Second controlled current flow output module, for by the positive controlled current flow and negative sense controlled current flow be mirrored to simultaneously across
The other end of the differential input end of operational amplifier is led, negative-feedback signal is formed；
Crystal oscillator unit, for generating main oscillations by the positive feedback signal, the crystal oscillator unit is connected to the mutual conductance
Between one end and ground of the differential input end of operational amplifier；
Second capacitance follows oscillation, Differential Input of second capacitance connection in operational transconductance amplifier for generating
The other end at end is between ground.
Further, the crystal oscillator unit includes crystal and the first capacitance, and the crystal is in parallel with the first capacitance.
Further, the operational transconductance amplifier includes the 0th transistor, the first transistor, second transistor, third crystalline substance
Body pipe and the 4th transistor, the 0th transistor are used to be arranged the bias current of operational transconductance amplifier, the first crystal
Pipe and second transistor constitute the differential input end of operational transconductance amplifier, and the third transistor is the negative of the first transistor
It carries, the positive output end of the junction composition operational transconductance amplifier of the third transistor and the first transistor, the described 4th
Transistor is the load of second transistor, the junction composition operational transconductance amplifier of the 4th transistor and second transistor
Negative sense output end.
Further, the first controlled current flow output module includes the 6th transistor and the 7th transistor, wherein flows through the
The positive controlled current flow that the current mirror of six transistors is generated from the operational transconductance amplifier, flows through the electric current of the 7th transistor
The drain electrode of the negative sense controlled current flow that mirror image is generated from the operational transconductance amplifier, the 6th transistor and the 7th transistor is equal
It is connected to one end of the differential input end of operational transconductance amplifier.
Further, the second controlled current flow output module include the 5th transistor, the 8th transistor, the 9th transistor and
Tenth transistor, wherein flow through the controlled electricity of forward direction that the current mirror of the 9th transistor is generated from the operational transconductance amplifier
Stream flows through the negative sense controlled current flow that the current mirror of the tenth transistor is generated from the operational transconductance amplifier, and the described 5th is brilliant
Body pipe and the 8th transistor be used for by the negative sense controlled current flow that operational transconductance amplifier generates be mirrored to respectively the 7th transistor with
Tenth transistor.
Further, the junction of the 6th transistor and the 7th transistor constitutes the defeated of the first controlled current flow output module
Outlet, and it is the first controlled current flow output module to flow through the electric current of the 6th transistor and flow through the difference between currents of the 7th transistor
Output current I1, the junction of the 9th transistor and the tenth transistor constitutes the output of the second controlled current flow output module
End, and it is the second controlled current flow output module to flow through the electric current of the 9th transistor and flow through the difference between currents of the tenth transistor
Output current I2, wherein I1=I2.
Further, further include variable capacitance, the variable capacitance is connected in parallel with the second capacitance, first capacitance and
The capacity of two capacitances is identical, and the parasitic capacitance value of the crystal falls into the adjustable capacitance range of the variable capacitance.
Further, the grid of the 0th transistor is the input terminal of bias voltage, wherein in the input terminal of bias voltage
The voltage value of input is gradually reduced in the self-oscillating of crystal oscillator.
Second of technical solution of the present invention be：
A kind of electronic system of fast start-up includes the crystal oscillator of control circuit and fast start-up, described quickly to rise
The crystal oscillator to shake provides clock signal to control circuit.
The third technical solution of the present invention is：
A kind of method of fast start-up, includes the following steps：
The starting of oscillation of electronic system is completed using the crystal oscillator of fast start-up.
The beneficial effects of the invention are as follows：Including operational transconductance amplifier, the first controlled current flow output module, the second controlled electricity
Stream output module, crystal oscillator unit and the second capacitance, crystal oscillator of the present invention are shaken conventional crystal by the way of image current
It swings the capacitance factor that limitation negative resistance improves in device to be offset, has expanded the scope of application of negative resistance, can effectively accelerate crystal
The starting of oscillation speed of oscillator.
Description of the drawings
Fig. 1 is traditional crystal oscillator；
Fig. 2 is the impedance of crystal oscillator in Fig. 1 with mutual conductance variation track figure；
Fig. 3 is the circuit diagram of the crystal oscillator of the present invention；
Fig. 4 is the equivalent circuit diagram of the crystal oscillator of the present invention；
Fig. 5 is the Induction Peried figure of the crystal oscillator of the present invention.
Specific implementation mode
Reference Fig. 3, a kind of crystal oscillator of fast start-up, including：
Operational transconductance amplifier 21 is amplified for the voltage signal to Differential Input, and generates positive controlled current flow
With negative sense controlled current flow；
First controlled current flow output module 22, for the positive controlled current flow and negative sense controlled current flow to be mirrored to simultaneously
One end of the differential input end of operational transconductance amplifier forms positive feedback signal；
Second controlled current flow output module 23, for the positive controlled current flow and negative sense controlled current flow to be mirrored to simultaneously
The other end of the differential input end of operational transconductance amplifier forms negative-feedback signal；
Crystal oscillator unit 24, for generating main oscillations by the positive feedback signal, the crystal oscillator unit be connected to it is described across
It leads between one end and ground of the differential input end of operational amplifier, the crystal oscillator unit includes crystal and the first capacitance, the crystalline substance
Body is in parallel with the first capacitance；
Second capacitance C2, follow oscillation, second capacitance connection defeated in the difference of operational transconductance amplifier for generating
Enter the other end at end between ground.
With reference to Fig. 3, it is further used as preferred embodiment, the operational transconductance amplifier includes the 0th transistor M0、
The first transistor M1, second transistor M2, third transistor M3With the 4th transistor M4, the 0th transistor M0For be arranged across
Lead the bias current of operational amplifier 21, the first transistor M1With second transistor M2Constitute operational transconductance amplifier 21
Differential input end, the third transistor M3For the first transistor M1Load, the third transistor M3With the first transistor M1
Junction constitute operational transconductance amplifier 21 positive output end, the 4th transistor M4For second transistor M2Load,
The 4th transistor M4With second transistor M2Junction constitute operational transconductance amplifier 21 negative sense output end.
With reference to Fig. 3, it is further used as preferred embodiment, the first controlled current flow output module 22 includes the 6th brilliant
Body pipe M6With the 7th transistor M7, wherein flow through the 6th transistor M6Current mirror from the operational transconductance amplifier 21 generate
Positive controlled current flow, flow through the 7th transistor M7The negative sense that is generated from the operational transconductance amplifier 21 of current mirror it is controlled
Electric current, the 6th transistor M6With the 7th transistor M7Drain electrode be all connected to the differential input end of operational transconductance amplifier 21
One end.
With reference to Fig. 3, it is further used as preferred embodiment, the second controlled current flow output module 23 includes the 5th brilliant
Body pipe M5, the 8th transistor M8, the 9th transistor M9With the tenth transistor M10, wherein flow through the 9th transistor M9Current mirror
The positive controlled current flow generated from the operational transconductance amplifier 21, flows through the tenth transistor M10Current mirror from the mutual conductance
The negative sense controlled current flow that operational amplifier 21 generates, the 5th transistor M5With the 8th transistor M8For operational transconductance to be put
The negative sense controlled current flow that big device 21 generates is mirrored to the 7th transistor M respectively7With the tenth transistor M10。
With reference to Fig. 3, it is further used as preferred embodiment, the 6th transistor M6With the 7th transistor M7Connection
Place constitutes the output end of the first controlled current flow output module 22, and flows through the 6th transistor M6Electric current and flow through the 7th crystal
Pipe M7Difference between currents be the first controlled current flow output module 22 output current I1, the 9th transistor M9With the tenth crystal
Pipe M10Junction constitutes the output end of the second controlled current flow output module 23, and flows through the 9th transistor M9Electric current and flow through
Tenth transistor M10Difference between currents be the second controlled current flow output module 23 output current I2, wherein I1=I2.
With reference to Fig. 3, it is further used as preferred embodiment, further includes variable capacitance CX, the variable capacitance CXWith second
Capacitance C2It is connected in parallel, the first capacitance C1LWith the second capacitance C2Capacity it is identical, the parasitic capacitance C of the crystalpValue fall
Enter the variable capacitance CXAdjustable capacitance range.
With reference to Fig. 3, it is further used as preferred embodiment, the 0th transistor M0Grid be bias voltage it is defeated
Enter end, wherein be gradually reduced in the self-oscillating of crystal oscillator in the voltage value that the input terminal of bias voltage inputs.
A kind of electronic system of fast start-up, includes the crystal oscillator of control circuit and fast start-up as shown in Figure 3,
The crystal oscillator of the fast start-up provides clock signal to control circuit.
A kind of method of fast start-up, includes the following steps：
The starting of oscillation of electronic system is completed using the crystal oscillator of fast start-up as shown in Figure 3.
The present invention is further detailed with specific embodiment with reference to the accompanying drawings of the specification.
With reference to Fig. 3, a kind of specific implementation of the crystal oscillator of fast start-up is present embodiments provided, which shakes
Swinging device includes：Operational transconductance amplifier 21, the first controlled current flow output module 22, the second controlled current flow output module 23, crystal oscillator
Unit 24, the second capacitance C2With variable capacitance CX。
In the present embodiment, the operational transconductance amplifier 21 of Differential Input is by the 0th transistor M0, the first transistor M1,
Two-transistor M2, third transistor M3With the 4th transistor M4Composition.Wherein, the 0th transistor M0, the first transistor M1With second
Transistor M2It is nMOS transistor, third transistor M3With the 4th transistor M4For pMOS transistors.Wherein, the 0th transistor
M0Effect be to provide a bias voltage, the 0th transistor M for operational transconductance amplifier 210Grid by external electrical
Press VgControl.External voltage VgLarger voltage can be started to input in the starting of oscillation of crystal oscillator so that operational transconductance amplifies
The gain of device 21 is higher, and the negative resistance of formation is larger, at this moment crystal oscillator fast start-up.It then, can be by the later stage of starting of oscillation
Decrescence small external voltage VgTo reduce gain and negative resistance so that circuit keeps stable oscillation.The 0th transistor M0Source
Electrode is grounded (i.e. Vss), the 0th transistor M0Drain electrode respectively with the first transistor M1Source electrode, second transistor M2Source
Electrode connects, the first transistor M1Grid and second transistor M2Grid constitute operational transconductance amplifier 21 difference
Input terminal.The third transistor M3It is connected to the first transistor M as load1Drain electrode and input voltage VddBetween；Institute
State the 4th transistor M4It is connected to second transistor M as load2Drain electrode and input voltage VddBetween.Wherein, first is brilliant
Body pipe M1With third transistor M3Junction constitute operational transconductance amplifier 21 positive output end, second transistor M2With
Four transistor M4Junction constitute operational transconductance amplifier 21 negative sense output end.
In the present embodiment, the first controlled current flow output module 22 is by the 6th transistor M6With the 7th transistor M7Composition,
In, the 6th transistor M6Grid and third transistor M3Grid connect with the positive output end of operational transconductance amplifier 21,
6th transistor M6Drain electrode and the 7th transistor M7Drain electrode with the first transistor M1Grid connection.Form first
High resistant node A.Flow through the 6th transistor M6The positive controlled current flow that is generated from the operational transconductance amplifier of current mirror；Stream
Through the 7th transistor M7The negative sense controlled current flow that is generated from the operational transconductance amplifier of current mirror.
In the present embodiment, the second controlled current flow output module 23 is by the 5th transistor M5, the 8th transistor M8, it is the 9th brilliant
Body pipe M9With the tenth transistor M10Composition.Wherein, the 5th transistor M5Grid and the 4th transistor M4Grid with mutual conductance transport
Calculate the negative sense output end connection of amplifier 21, the 5th transistor M5Source electrode and input voltage VddConnection, the described 8th
Transistor M8It is connected to the 5th transistor M5Drain electrode and ground between.Wherein, the 5th transistor M5With the 8th transistor M8Work
With being that the negative sense controlled current flow of operational transconductance amplifier 21 is mirrored to nMOS pipes from pMOS pipe equivalences, it is then transmitted to the 7th again
Transistor M7With the tenth transistor M10Among.The 9th transistor M9Grid and the 6th transistor M6Grid connection, it is described
9th transistor M9Drain electrode, the tenth transistor M10Drain electrode with second transistor M2Base stage connection, formed second
High resistant node B.The tenth transistor M10Grid and the 7th transistor M7Grid with the 8th transistor M8Drain electrode
Connection.
The 6th transistor M6With the 7th transistor M7Junction constitute the first controlled current flow output module 22 output
End, and flow through the 6th transistor M6Electric current and flow through the 7th transistor M7Difference between currents be the first controlled current flow export mould
The output current I1 of block 22.The 9th transistor M9With the tenth transistor M10Junction constitute the second controlled current flow export mould
The output end of block 23, and flow through the 9th transistor M9Electric current and flow through the tenth transistor M10Difference between currents be second controlled
The output current I2 of current output module 23, wherein I1=I2.It, can be by the corresponding device of mirror image in circuit in actual design
Part ensures I1=I2 using the device of identical parameter.
The difference that voltage signal on first high resistant node A and the second high resistant node B feeds back to operational transconductance amplifier is defeated
Enter in end, positive feedback is formed in the first high resistant node A, negative-feedback is formed in the second high resistant node B.
In the present embodiment, the crystal oscillator unit 24 includes crystal XTAL and the first capacitance C1L, wherein crystal XTAL and
One capacitance C1LBe connected in parallel between the first high resistant node A.And crystal XTAL and the first capacitance C1LJust by circuit
Feedback effect generates oscillation, and resonance is on crystal frequency.
In the second capacitance C of the second high resistant node B connections2With variable capacitance CxGeneration follows oscillation, and being provided with can power transformation
Hold CxPurpose be to facilitate technical staff by the capacitance adjustment of the second high resistant node B accesses and the first high resistant node A access
Capacitance it is identical so that the parameter in crystal oscillator is symmetrical.It may occur to persons skilled in the art that by the first capacitance C1LIt changes into
Variable capacitance can reach identical effect.
The present invention operation principle be：Operational transconductance amplifier 21 and the first controlled current flow output module 22 constitute the main electricity that shakes
Road, and operational transconductance amplifier 21 and the second controlled current flow output module 23 constitute mirror image circuit.In wherein Fig. 4, with equivalent electricity
Hinder Rm, equivalent capacity CmWith equivalent inductance LmAnd parasitic capacitance CpIndicate crystal XTAL, parasitic capacitance CpWith the first capacitance C1L's
The first shunt capacitance C of parallel value1It indicates, variable capacitance CxWith the second capacitance C2Parallel value with the second shunt capacitance CLIt indicates,
First shunt capacitance C under normal circumstances1=the second shunt capacitance CL, the present invention is generated other one in the way of current mirror
A main oscillations variation for following the main loop that shakes follows oscillation.As shown in figure 4, the present invention may finally be equivalent to negative resistance and capacitance
Concatenated form, is not present individual shunt capacitance, and this characteristic eliminates the influence of shunt capacitance so that negative resistance is straight with mutual conductance
Presentation linear relationship is connect, has the characteristic of fast start-up.The present invention will be in traditional crystal oscillator by the way of image current
The capacitance factor that limitation negative resistance improves is offset, and the realization range of negative resistance can be promoted, and is coordinated variable gain, can be accelerated crystalline substance
The starting of oscillation speed of oscillation body device.After crystal oscillator starting of oscillation speed is accelerated, Induction Peried shortens so that effective work of electronic system
Make time increase, improve the response speed of electronic system, data transmission efficiency can be improved.In addition, shortening Induction Peried has
Power consumption is reduced conducive to Low Power Electronic System.
With reference to Fig. 5, the Induction Peried figure of crystal oscillator in the present embodiment, it is seen that in 400us or so, this implementation
The crystal oscillator of example can complete starting of oscillation, and traditional crystal oscillator Induction Peried needs to reach 1ms or more.
The present embodiment provides a kind of electronic systems of fast start-up, include the crystal oscillation of control circuit and fast start-up
Device.Wherein, electronic system can be such as smartwatch, sensor or other Low Power Electronic Systems, and control circuit can be
Need the electronic circuit of work clock, such as circuit containing embedded control chip.
The present embodiment provides a kind of methods of fast start-up, include the following steps：Utilize the crystal oscillator of fast start-up
To complete the starting of oscillation of electronic system.
It is to be illustrated to the preferable implementation of the present invention, but the present invention is not limited to the embodiment above, it is ripe
Various equivalent variations or replacement can also be made under the premise of without prejudice to spirit of that invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all contained in the application claim limited range a bit.
Claims (10)
1. a kind of crystal oscillator of fast start-up, which is characterized in that including：
Operational transconductance amplifier is amplified for the voltage signal to Differential Input, and generates positive controlled current flow and negative sense
Controlled current flow；
First controlled current flow output module, for the positive controlled current flow and negative sense controlled current flow to be mirrored to mutual conductance fortune simultaneously
One end of the differential input end of amplifier is calculated, positive feedback signal is formed；
Second controlled current flow output module, for the positive controlled current flow and negative sense controlled current flow to be mirrored to mutual conductance fortune simultaneously
The other end of the differential input end of amplifier is calculated, negative-feedback signal is formed；
Crystal oscillator unit, for generating main oscillations by the positive feedback signal, the crystal oscillator unit is connected to the operational transconductance
Between one end and ground of the differential input end of amplifier；
Second capacitance follows oscillation for generating, differential input end of second capacitance connection in operational transconductance amplifier
The other end is between ground.
2. a kind of crystal oscillator of fast start-up according to claim 1, it is characterised in that：The crystal oscillator unit includes
Crystal and the first capacitance, the crystal are in parallel with the first capacitance.
3. a kind of crystal oscillator of fast start-up according to claim 1, it is characterised in that：The operational transconductance amplification
Device includes the 0th transistor, the first transistor, second transistor, third transistor and the 4th transistor, the 0th transistor
Bias current for operational transconductance amplifier to be arranged, the first transistor and second transistor constitute operational transconductance amplifier
Differential input end, the third transistor be the first transistor load, the company of the third transistor and the first transistor
Connect place constitute operational transconductance amplifier positive output end, the 4th transistor be second transistor load, the described 4th
The junction of transistor and second transistor constitutes the negative sense output end of operational transconductance amplifier.
4. a kind of crystal oscillator of fast start-up according to claim 1, it is characterised in that：First controlled current flow
Output module includes the 6th transistor and the 7th transistor, wherein the current mirror for flowing through the 6th transistor is transported from the mutual conductance
The positive controlled current flow that amplifier generates is calculated, flows through what the current mirror of the 7th transistor was generated from the operational transconductance amplifier
The drain electrode of negative sense controlled current flow, the 6th transistor and the 7th transistor is all connected to the Differential Input of operational transconductance amplifier
The one end at end.
5. a kind of crystal oscillator of fast start-up according to claim 4, it is characterised in that：Second controlled current flow
Output module includes the 5th transistor, the 8th transistor, the 9th transistor and the tenth transistor, wherein flows through the 9th transistor
The positive controlled current flow that is generated from the operational transconductance amplifier of current mirror, flow through the current mirror of the tenth transistor from institute
The negative sense controlled current flow of operational transconductance amplifier generation, the 5th transistor and the 8th transistor are stated for putting operational transconductance
The negative sense controlled current flow that big device generates is mirrored to the 7th transistor and the tenth transistor respectively.
6. a kind of crystal oscillator of fast start-up according to claim 5, it is characterised in that：6th transistor and
The junction of 7th transistor constitutes the output end of the first controlled current flow output module, and flow through the 6th transistor electric current and
The difference between currents for flowing through the 7th transistor are the output current I1 of the first controlled current flow output module, the 9th transistor and the
The junction of ten transistors constitutes the output end of the second controlled current flow output module, and flows through the electric current and stream of the 9th transistor
Difference between currents through the tenth transistor are the output current I2 of the second controlled current flow output module, wherein I1=I2.
7. a kind of crystal oscillator of fast start-up according to claim 1, it is characterised in that：Further include variable capacitance,
The variable capacitance is connected in parallel with the second capacitance.
8. a kind of crystal oscillator of fast start-up according to claim 3, it is characterised in that：0th transistor
Grid be bias voltage input terminal, wherein bias voltage input terminal input voltage value crystal oscillator starting of oscillation
It is gradually reduced in the process.
9. a kind of electronic system of fast start-up, it is characterised in that：It is quickly risen with as described in claim 1 including control circuit
The crystal oscillator of the crystal oscillator to shake, the fast start-up provides clock signal to control circuit.
10. a kind of method of fast start-up, it is characterised in that：Include the following steps：
The starting of oscillation of electronic system is completed using the crystal oscillator of fast start-up as described in claim 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109286372A (en) * | 2018-09-19 | 2019-01-29 | 电子科技大学 | A kind of high-precision pierce circuit |
| CN110176905A (en) * | 2019-01-24 | 2019-08-27 | 上海磐启微电子有限公司 | A kind of single pin is without the adjustable crystal oscillator of capacitance x frequency outside piece |
| CN113346873A (en) * | 2021-06-09 | 2021-09-03 | 北京百瑞互联技术有限公司 | Fast start crystal oscillator, start method, clock circuit, medium, and device |
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| CN113346873A (en) * | 2021-06-09 | 2021-09-03 | 北京百瑞互联技术有限公司 | Fast start crystal oscillator, start method, clock circuit, medium, and device |
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Application publication date: 20180911 |