CN106656045A - Oscillator circuit with temperature compensation and temperature compensation method - Google Patents
Oscillator circuit with temperature compensation and temperature compensation method Download PDFInfo
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- CN106656045A CN106656045A CN201611039839.1A CN201611039839A CN106656045A CN 106656045 A CN106656045 A CN 106656045A CN 201611039839 A CN201611039839 A CN 201611039839A CN 106656045 A CN106656045 A CN 106656045A
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- China
- Prior art keywords
- temperature
- transmission gate
- compensating
- pierce circuit
- oscillator
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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
Abstract
The invention discloses an oscillator circuit with temperature compensation comprising an oscillator circuit, wherein a transmission gate switch is additionally arranged at the bottom of a charge and discharge capacitor of the oscillator circuit to serve as a resistor changing with temperature, and the output frequency of an oscillator can be stabilized within a whole temperature range with the temperature change by adjusting the temperature coefficient of current Itc and the size of the transmission gate switch. By adoption of the circuit and the method, the problem that the output clock frequency of the oscillator changes greatly in temperature/voltage is solved, so that the change of the output frequency of the oscillator is kept within a very small range.
Description
Technical field
The invention belongs to oscillator technique field, more particularly to a kind of pierce circuit with temperature-compensating.
Background technology
As the arrival intelligent domestic and intelligent health industry of the Internet of things era certainly will be expedited the emergence of out for MCU chip is bigger
Demand.As the fast development of the development of singlechip technology (MCU chip), semiconductor technology and technique causes MCU properties of product
It is greatly improved to meet the requirement of Internet of Things development trend instantly.
As core technology therein, clock generation circuit as the inside of MCU chip important composition module to MCU core
The performance of piece plays vital effect, and first：Oscillator to innernal CPU decide after clock division as MCU timer/
Counter clock signal, second：It is this kind of using such as on atomizer product clock signal such as PWM etc. to be provided to external circuit
Using.This certainly will be higher for the stability of clock and voltage temperature characteristic requirement.
Patent application 201410601633.8 discloses a kind of temperature compensated oscillator and including temperature compensated oscillator
Device.The temperature compensated oscillator includes：Oscillating unit, is configured with operation electric current and operating voltage produces vibration letter
Number；Biasing circuit, is configured to control operation electric current so that the frequency of oscillator signal increases as temperature is raised；Voltage is produced
Raw unit, is configured to produce with the operating voltage of temperature change.It is by voltage generating unit control in the patent application
Operating voltage causes the frequency of oscillator signal to reduce as temperature is raised, so as to complementally compensate oscillator signal with biasing circuit
The change that changes relative to temperature of frequency, to reach the effect with temperature-compensating.Although being also equipped with switch in the circuit
Circuit, but on-off circuit is used only to adjust the underlayer voltage level that voltage generating unit operating voltage produces transistor, and
Do not possess the effect of temperature-compensating.
At present the main performance bottleneck of MCU pierce circuits is that oscillator output frequencies compare temperature and power source change
It is sensitive so causing to be applied in many fields or application effect is not so good as people's will.For example as atomizer products application
If the output frequency of MCU chip changes with temperature voltage, and so at different temperature atomizer atomizing effect can be very than larger
Difference is uncontrollable.And the meeting as the input clock signal of counter/timer is because the poor temperature/voltage of clock circuit
Characteristic and the problems such as timing uncertainty.
As shown in figure 1, current I flows through resistor R produces reference voltage VREF, electric current NI is by inverter controlling to electric capacity C1
With C2 charging and dischargings wherein charging current NI, the charging interval can calculate.Electric discharge is directly to discharge over the ground, and discharge time can
To ignore.Assume initial state G1=0, G2=1 electric currents NI charges to electric capacity C1, and electric capacity C2 repid discharges over the ground, V1 and V2 is equal
Voltage VREF is approached with the rate of climb less than voltage VREF wherein V1 voltages, at the same voltage V2 voltages be 0 (close ground potential) when
When voltage V1 rises slightly above VREF voltages, the upset of comparator 1 output understands that G1 is overturn to 1, G2 and turns over by 1 change 0 according to circuit
Go to 0 now electric current NI to electric capacity C2 charge, electric capacity C1 repid discharges over the ground.Knowable to above-mentioned analysis：Oscillator in theory
Cycle time is only relevant with resistance value R and capacitance C and electric current multiple N, but side circuit exist it is many it is non-ideal because
Element causes oscillator output frequencies very sensitive to temperature change.
At present temperature is included on the non-ideal factor that oscillator output frequencies affect：
1) comparator postpones：Comparator finite bandwidth, Slew Rate etc..2) logic gate delay：Mos pipes carrier mobility is parasitic
The delay that capacitance resistance is produced.3) charge and discharge switch postpones：The delay that switch channel resistance, parasitic capacitance are produced.Three above
Non-ideal factor is especially sensitive to temperature change, and it is very big that this causes oscillator output frequencies to change at different temperature.
The content of the invention
Based on this, thus the primary mesh of the present invention be to provide a kind of pierce circuit with temperature-compensating and temperature and mend
Compensation method, the circuit and method can solve the problem that the oscillator output clock frequency problem larger to temperature/voltage variation, make vibration
The output frequency change of device is stored in the range of very little.
Another mesh ground of the present invention is to provide a kind of pierce circuit with temperature-compensating and temperature compensation,
The circuit and method are realized simple, are easy to control, can greatly promote the temperature characterisitic of oscillator, while so that MCU chip
Range of application and performance are greatly improved.
For achieving the above object, the technical scheme is that：
A kind of pierce circuit with temperature-compensating, includes pierce circuit, it is characterised in that in pierce circuit
Charge and discharge capacitance bottom add a transmission gate switch as the resistance for varying with temperature, oscillator output frequencies can be with temperature
Degree change can pass through to adjust the temperature coefficient and transmission gate switch size of electric current Itc and the frequency of oscillator be adjusted to whole
It is stable in individual temperature range.
Further, the charge and discharge capacitance has a C1 and C2, and the transmission gate switch is S1, S2, correspond respectively to C1 and
C2。
Further, N pipe P pipe transmission gate in parallel, the transmission gate are concatenated between the bottom crown and ground of charge and discharge capacitance
Equivalent conducting resistance is with temperature into positive correlation.
A kind of temperature compensation of the pierce circuit with temperature-compensating, it is characterised in that the method includes transmission
Door switch simulates temperature resistance and temperature-compensated current Itc double compensation modes.
Further, by the transmission gate switch of pierce circuit charge and discharge capacitance bottom as the resistance for varying with temperature,
To realize that the mode for simulating temperature control carries out temperature-compensating.
Further, the transmission gate switch simulates temperature resistance, is to realize frequency by adjusting transmission gate switch size
The temperature in rectification temperature range.
The temperature-compensated current Itc, is the frequency of oscillator to be adjusted whole by adjusting the temperature coefficient of electric current Itc
It is stable in individual temperature range.
Further, the non-ideal time delay such as gate increases under high temperature, causes oscillator to export clock period time
Extend, then charging current can be adjusted to positive temperature coefficient, capacitor charging time is reduced at high temperature and is ensured oscillator clock
Cycle time will not increase；The logic gate delay time shortens during low temperature, and the current value of positive temperature coefficient diminishes, so the charging interval
Become big whole clock period time constant.
The pierce circuit that the present invention is realized, it is defeated in the range of -40～85deg through simulating, verifying 16M clock frequencies
Go out frequency change excursion 0.5%, and do not adopt the oscillator 16M clock output frequencies of said temperature compensation circuit to do
To 4%.It can be seen that the temperature characterisitic for introducing oscillator after above-mentioned compensation circuit is greatly improved, as the important of MCU chip
Part causes the range of application and performance of MCU chip to be greatly improved.
Description of the drawings
Fig. 1 is the circuit diagram that prior art is implemented.
Fig. 2 is the pierce circuit figure that the present invention is implemented.
Fig. 3 is the oscillator temperature compensation principle isoboles that the present invention is implemented.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
It is shown in Figure 2, it is the pierce circuit implemented of the invention, in the charge and discharge capacitance C1 and C2 of pierce circuit
Bottom adds transmission gate switch S1, a S2 as the resistance for varying with temperature, and oscillator output frequencies can be with temperature change
The temperature coefficient and transmission gate switch size that electric current Itc can be passed through to adjust adjusts the frequency of oscillator to whole temperature
In the range of it is stable.
It has been investigated that, produce because of temperature change time delay mainly gate such as NAND gate, phase inverter etc. with
And the channel resistance of the metal-oxide-semiconductor as charging and discharging branch road.When oscillator operating frequency is higher, a clock period time, shakes
The RC times of device are swung, is the time delay that the non-ideal factors such as the gate comparator in circuit are produced.It can thus be appreciated that with shaking
Swing device frequency and raise i.e. less and less, it is bigger that non-ideal time accounts for cycle proportion, when non-ideal time is varied with temperature so
Whole clock period time also can be varied with temperature.
Therefore, the present invention simulates temperature resistance and temperature-compensated current Itc double compensations mode come real using transmission gate switch
Output frequency of the existing oscillator in the range of total temperature is stablized.
Wherein, transmission gate switch simulation temperature resistance compensation principle is as shown in Figure 3.
N pipe P pipe transmission gate in parallel, the equivalent conducting resistance of the transmission gate are concatenated between the bottom crown and ground of electric capacity
With temperature into positive correlation.The charging interval when fixed current I_ch charges to reference voltage VREF to electric capacity C0：
tch=C0*(VREF/Ich-Ron) (1)
Formula (1) state oscillator capacitance from zero potential charging voltage VREF value when charging interval, in formula tch for charging when
Between, charging currents of the Ich to electric capacity C0, electric capacity bottom crown accesses the equivalent channel resistance Ron of transmission gate, the resistance expression formula such as formula
(2) shown in：
Formula (2) represents the equivalent channel resistance of transmission gate switch, because carrier mobility is varied with temperature, is also
One resistance for varying with temperature resistance increase.Diminish as temperature rises the high resistance change big charging interval according to formula (1), mend
Repay because temperature rises the time delay for causing non-ideal factor to cause and increases, so whole clock period time is in total temperature model
Enclose interior holding constant.
Adopt the compensation Frequency Patterns of temperature-compensated current Itc for：
The principle of the current compensation oscillator frequency with temperature coefficient is to be charged to reference voltage to electric capacity by electric current
VREF, its charging interval relative to the change of temperature T because have a linear change amount to be expressed as：
Itc=I ± Δs I (T) (3)
With reference to Fig. 2, the charging interval can be derived
VREF=I*R*C=N*Itc*tch (4)
Varied with temperature the charging interval and can be increased or reduce by above formula is visible, specifically see electric current be positive temperature coefficient or
Negative temperature coefficient, by adjusting current temperature coefficient size charging interval size at different temperatures can be controlled.
Clock period time:
TCLK=2*tch+td (6)
Understand that clock period time is made up of two parts by formula (6)：A part of capacitor charging time 2* another part logics
The non-ideal time delay of door.
The non-ideal time delay such as gate increases under such as high temperature, causes oscillator output clock period time to extend,
Charging current can so be adjusted to positive temperature coefficient, when reducing the capacitor charging time guarantee oscillator clock cycle at high temperature
Between will not increase；The logic gate delay time shortens during low temperature, and the current value of positive temperature coefficient diminishes, so the charging interval becomes big whole
Individual clock period time is constant.Understand that the clock cycle (clock frequency) will not become with temperature in the range of total temperature by being analyzed above
Change.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of pierce circuit with temperature-compensating, includes pierce circuit, it is characterised in that in pierce circuit
Charge and discharge capacitance bottom adds a transmission gate switch as the resistance for varying with temperature, and oscillator output frequencies can be with temperature
Change can pass through to adjust the temperature coefficient and transmission gate switch size of electric current Itc and the frequency of oscillator be adjusted to whole
It is stable in temperature range.
2. there is as claimed in claim 1 the pierce circuit of temperature-compensating, it is characterised in that the charge and discharge capacitance has
C1 and C2, the transmission gate switch is S1, S2, corresponds respectively to C1 and C2.
3. there is as claimed in claim 1 the pierce circuit of temperature-compensating, it is characterised in that the bottom crown of charge and discharge capacitance
N pipe P pipe transmission gate in parallel is concatenated and ground between, the equivalent conducting resistance of the transmission gate is with temperature into positive correlation.
4. a kind of temperature compensation of the pierce circuit with temperature-compensating, it is characterised in that the method includes transmission gate
Switch simulation temperature resistance and temperature-compensated current Itc double compensation modes.
5. there is as claimed in claim 4 the temperature compensation of the pierce circuit of temperature-compensating, it is characterised in that pass through
The transmission gate switch of pierce circuit charge and discharge capacitance bottom is realized simulating the mode of temperature control as the resistance for varying with temperature
Carry out temperature-compensating.
6. there is as claimed in claim 5 the temperature compensation of the pierce circuit of temperature-compensating, it is characterised in that described
Transmission gate switch simulates temperature resistance, is to realize frequency temperature in rectification temperature range by adjusting transmission gate switch size.
7. there is as claimed in claim 4 the temperature compensation of the pierce circuit of temperature-compensating, it is characterised in that described
Temperature-compensated current Itc, is the frequency of oscillator to be adjusted in whole temperature range by adjusting the temperature coefficient of electric current Itc
It is stable.
8. there is as claimed in claim 7 the temperature compensation of the pierce circuit of temperature-compensating, it is characterised in that high temperature
Under, charging current is adjusted to positive temperature coefficient, reduce capacitor charging time and ensure that oscillator clock cycle time will not increase；It is low
The logic gate delay time shortens when warm, and the current value of positive temperature coefficient diminishes, so when the charging interval becomes the big whole clock cycle
Between it is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611039839.1A CN106656045A (en) | 2016-11-22 | 2016-11-22 | Oscillator circuit with temperature compensation and temperature compensation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611039839.1A CN106656045A (en) | 2016-11-22 | 2016-11-22 | Oscillator circuit with temperature compensation and temperature compensation method |
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| CN106656045A true CN106656045A (en) | 2017-05-10 |
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ID=58812400
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| CN201611039839.1A Pending CN106656045A (en) | 2016-11-22 | 2016-11-22 | Oscillator circuit with temperature compensation and temperature compensation method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107659268A (en) * | 2017-10-23 | 2018-02-02 | 广州启途科技有限公司 | The wide scope temperature compensation of voltage controlled oscillator in chip |
| CN107689774A (en) * | 2017-07-21 | 2018-02-13 | 芯海科技（深圳）股份有限公司 | A kind of high frequency Low Drift Temperature RC oscillators |
| CN108173520A (en) * | 2017-12-26 | 2018-06-15 | 宁波芯路通讯科技有限公司 | The pierce circuit and method of a kind of temperature-compensating |
| CN108832896A (en) * | 2018-06-25 | 2018-11-16 | 电子科技大学 | A kind of outer adjustable tension and relaxation type voltage-controlled oscillator circuit |
| CN109586673A (en) * | 2018-11-26 | 2019-04-05 | 芯海科技（深圳）股份有限公司 | A kind of oscillating circuit of dynamic temperature correction |
| CN112994665A (en) * | 2021-04-21 | 2021-06-18 | 成都铭科思微电子技术有限责任公司 | CMOS delay circuit with temperature compensation |
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| JP2007208584A (en) * | 2006-02-01 | 2007-08-16 | Ricoh Co Ltd | Frequency adjusting circuit |
| CN101753115A (en) * | 2008-10-09 | 2010-06-23 | 盛群半导体股份有限公司 | Temperature compensation circuit and method |
| CN104601114A (en) * | 2013-10-30 | 2015-05-06 | 三星电子株式会社 | Temperature-compensated oscillator and device including the same |
| CN105676939A (en) * | 2016-03-25 | 2016-06-15 | 厦门新页微电子技术有限公司 | Adjustable precise over-temperature protection circuit applied to wireless charging control chip |
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| CN1224279A (en) * | 1997-09-24 | 1999-07-28 | 汤森·汤森及同仁有限合伙公司 | Low power liquid-crystal display driver |
| CN1283893A (en) * | 1999-08-06 | 2001-02-14 | 摩托罗拉公司 | Temp compensation method of reference oscillator |
| CN1618166A (en) * | 2002-01-21 | 2005-05-18 | 西铁城时计株式会社 | Temperature compensation type oscillator |
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| CN105676939A (en) * | 2016-03-25 | 2016-06-15 | 厦门新页微电子技术有限公司 | Adjustable precise over-temperature protection circuit applied to wireless charging control chip |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107689774A (en) * | 2017-07-21 | 2018-02-13 | 芯海科技（深圳）股份有限公司 | A kind of high frequency Low Drift Temperature RC oscillators |
| CN107659268A (en) * | 2017-10-23 | 2018-02-02 | 广州启途科技有限公司 | The wide scope temperature compensation of voltage controlled oscillator in chip |
| CN108173520A (en) * | 2017-12-26 | 2018-06-15 | 宁波芯路通讯科技有限公司 | The pierce circuit and method of a kind of temperature-compensating |
| CN108832896A (en) * | 2018-06-25 | 2018-11-16 | 电子科技大学 | A kind of outer adjustable tension and relaxation type voltage-controlled oscillator circuit |
| CN108832896B (en) * | 2018-06-25 | 2021-04-02 | 电子科技大学 | Off-chip adjustable relaxation type voltage-controlled oscillator circuit |
| CN109586673A (en) * | 2018-11-26 | 2019-04-05 | 芯海科技（深圳）股份有限公司 | A kind of oscillating circuit of dynamic temperature correction |
| CN112994665A (en) * | 2021-04-21 | 2021-06-18 | 成都铭科思微电子技术有限责任公司 | CMOS delay circuit with temperature compensation |
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