CN108123699A - A kind of Low Drift Temperature oscillator and the method for obtaining Low Drift Temperature clock frequency - Google Patents
A kind of Low Drift Temperature oscillator and the method for obtaining Low Drift Temperature clock frequency Download PDFInfo
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- CN108123699A CN108123699A CN201810073516.7A CN201810073516A CN108123699A CN 108123699 A CN108123699 A CN 108123699A CN 201810073516 A CN201810073516 A CN 201810073516A CN 108123699 A CN108123699 A CN 108123699A
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- temperature coefficient
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
Abstract
The present invention relates to a kind of Low Drift Temperature oscillators, belong to oscillator technique field.A kind of Low Drift Temperature oscillator and the method for obtaining Low Drift Temperature clock frequency, it is characterised in that：Including positive temperature coefficient current generating circuit, negative temperature parameter current generation circuit, electric current mixing conversion circuit and capacitance shaping circuit, positive temperature coefficient current generating circuit generates a positive temperature coefficient main branch by current mirror and a positive temperature current calibrates branch, and negative temperature parameter current generation circuit generates a negative temperature coefficient main branch and a negative temperature correcting current branch by current mirror；Zero-temperature coefficient electrical current is obtained after mixing conversion circuit mixing by electric current, zero-temperature coefficient electrical current obtains different Low Drift Temperature clock frequencies after carrying out charge and discharge shaping to the constant capacitance in capacitance shaping circuit after being scaled up or down as desired.The present invention corrects the temperature drift of oscillator using the positive temperature curve and subzero temperature curve of electric current, than the precision higher of the circuit control temperature drift with other forms, it is easier to adjust.
Description
Technical field
The present invention relates to a kind of oscillator, more particularly to a kind of Low Drift Temperature oscillator and the side for obtaining Low Drift Temperature clock frequency
Method.
Background technology
In the prior art oscillator generally use annular or RC charge and discharge oscillating structure, the frequency of ring oscillator with
The device temperature characteristic and technique correlation of power supply and phase inverter are very big, since the difference of chip chamber is big and can not calibrate temperature drift,
The uniformity for causing product is very poor.RC oscillators are because used band gap voltage to generate charging current, final frequency and electricity
Hinder R it is related with the temperature characterisitic of capacitance C, actually resistance R and capacitance C there are 10% or so temperature drift, even if passing through
The resistance of positive and negative temperature drift is used in combination to reduce, difference can also be higher than 2% between general piece, and when being calibrated to temperature drift,
Also oscillator frequency absolute value is influenced whether；And during alignment oscillator frequency absolute value, and influence whether the temperature of oscillator frequency
Drift.Because existing oscillator structure cannot be accomplished individually to calibrate temperature drift and frequency absolute value, between piece finally
Temperature drift will ensure by technique, very high to the coherence request of technique.
The content of the invention
Since above-mentioned traditional scheme is difficult to the temperature drift calibration of resistance, calibration accuracy also is difficult to ensure.The present invention
Be designed to provide thus the present invention propose a kind of designing scheme calibrated to Positive and Negative Coefficient Temperature current weights, can
To reach good temperature drift calibration accuracy.Frequency temperature drift and frequency absolute value to oscillator are calibrated respectively, both ensure that
The temperature drift of frequency in turn ensures the absolute value of frequency.It is most of all, rough unlike calibrating resistance and capacitance.
Technical solution：
A kind of Low Drift Temperature oscillator, including positive temperature coefficient current generating circuit, negative temperature parameter current generation circuit, electricity
Stream mixing conversion circuit and capacitance shaping circuit, positive temperature coefficient current generating circuit generate a positive temperature system by current mirror
Number main branch and a positive temperature current calibration branch, negative temperature parameter current generation circuit generate a subzero temperature by current mirror
Spend coefficient main branch and a negative temperature correcting current branch；Positive temperature coefficient main branch, positive temperature current calibration branch, subzero temperature
Degree coefficient main branch and negative temperature correcting current branch, which are mixed by electric current after conversion circuit mixes, obtains zero-temperature coefficient electrical current,
Zero-temperature coefficient electrical current obtains after carrying out charge and discharge shaping to the constant capacitance in capacitance shaping circuit after being scaled up or down as desired
The clock frequency output of different Low Drift Temperatures.
Further, positive temperature coefficient main branch and negative temperature coefficient main branch can adjust multiple by current mirror.
Further, electric current mixing conversion circuit includes positive temperature coefficient calibration parallel circuit, negative temperature coefficient calibration point electricity
Road, zero-temperature coefficient main branch and zero-temperature coefficient calibration circuit；Positive temperature current calibration branch is calibrated by positive temperature coefficient
Parallel circuit, negative temperature correcting current branch is after negative temperature coefficient calibrates parallel circuit to positive temperature coefficient main branch and negative temperature
Coefficient main branch carries out mixing calibration, and the principal current of output obtains the main electricity of zero-temperature coefficient by zero-temperature coefficient electrical current main branch
Stream, calibration electric current obtain zero-temperature coefficient calibration electric current, zero-temperature coefficient principal current by zero-temperature coefficient electrical current calibration circuit
Different size of charging and discharging currents are generated with after zero-temperature coefficient calibration electric current mixing.
Further, capacitance shaping circuit includes two equivalent constant capacitances, two comparators and a RS (reset
Set) trigger, zero-temperature coefficient electrical current charge to capacitance after into comparator negative terminal, comparator input to rest-set flip-flop after most
Clock frequency is obtained eventually, the clock frequency of output is equal to I/ (2C*Vref), and wherein I is charging and discharging currents, and C is the value of capacitance,
Vref is the reference voltage of comparator anode.
Further, powered using a voltage stabilizing LDO (low pressure difference linear voltage regulator) to the circuit of oscillator, avoid power supply
Influence of the voltage to output frequency.
A kind of method for obtaining Low Drift Temperature clock frequency, using above-mentioned Low Drift Temperature oscillator, and by the following steps：
Step S1, when positive temperature coefficient absolute value is less than negative temperature coefficient absolute value, positive temperature is amplified using current mirror
Coefficient main branch reduces negative temperature coefficient main branch；When positive temperature coefficient absolute value is less than negative temperature coefficient absolute value, make
Amplify negative temperature coefficient main branch with current mirror or reduce positive temperature coefficient main branch, be added Positive and Negative Coefficient Temperature electric current close
In zero；
Step S2, by the positive temperature coefficient main branch of adjustment, the negative temperature coefficient main branch of adjustment and positive temperature current school
Quasi- branch, negative temperature correcting current branch carry out composed correction, obtain zero-temperature coefficient electrical current.
Step S3, zero-temperature coefficient electrical current respectively by zero-temperature coefficient main branch and zero-temperature coefficient calibration circuit after again
It is overlapped and obtains different size of charging and discharging currents；
Step S4, charged to fixed value capacitance with charging and discharging currents, obtained by adjusting the size of charging and discharging currents
Different Low Drift Temperature clock frequencies.
Advantageous effect：
1) present invention corrects the temperature drift of oscillator using the positive temperature curve and subzero temperature curve of electric current, than with other forms
Circuit controls the precision higher of temperature drift, is also easier to adjust；
2) positive temperature drift electric current and subzero temperature drift electric current can be realized with common and simple circuit, than manufacturing high-precision band
Gap is more prone to；
3) different frequencies is obtained by setting different electric currents and temperature drift, than the frequency-adjustable model of other structures oscillator
It encloses more extensively, is also easier to realize；
4) can be powered using voltage-stablizer to the magnet oscillator circuit of oscillator, to obtain higher power supply rejection ratio.
Description of the drawings
Fig. 1 is oscillator principle schematic diagram.
Fig. 2 is oscillator principle block diagram.
Wherein：101 be positive temperature coefficient current generating circuit, and 102 be negative temperature parameter current generation circuit, and 103 is just
Temperature current, 104 be negative temperature electric current, and 105 mix conversion circuit for electric current, and 106 be zero-temperature coefficient electrical current, and 107 be capacitance
Shaping circuit, 108 export for clock frequency, and 50 be voltage stabilizing LDO (low pressure difference linear voltage regulator), and 53 be positive temperature coefficient calibration point
Circuit, 54 be negative temperature coefficient calibration parallel circuit, 55 be zero-temperature coefficient main branch and 56 be zero-temperature coefficient calibration circuit, 71
Branch is calibrated for positive temperature current, 72 be negative temperature correcting current branch, and 73 be positive temperature coefficient main branch, and 74 be negative temperature system
Number main branch, 77 be principal current, and 78 be calibration electric current, and 79 calibrate to obtain zero-temperature coefficient principal current, 80 for zero-temperature coefficient
Electric current, 81 be charging and discharging currents.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings：
As shown in Figure 1, a kind of Low Drift Temperature oscillator, including positive temperature coefficient current generating circuit 101, negative temperature coefficient electricity
Flow generation circuit 102, electric current mixing conversion circuit 105 and capacitance shaping circuit 107, positive temperature coefficient current generating circuit 101
One positive temperature coefficient main branch 73 is generated by current mirror and a positive temperature current calibrates branch 71, negative temperature parameter current
Generation circuit 102 generates a negative temperature coefficient main branch 74 and a negative temperature correcting current branch 71 by current mirror；Just
Temperature coefficient main branch 73, positive temperature current calibration branch 71, negative temperature coefficient main branch 74 and negative temperature correcting current branch
71 mix acquisition zero-temperature coefficient electrical current 106 after conversion circuit 105 mixes by electric current, and zero-temperature coefficient electrical current 106 is on demand
The clock of different Low Drift Temperatures is obtained after carrying out charge and discharge shaping to the constant capacitance in capacitance shaping circuit 107 after being sized
Rate-adaptive pacemaker 108.
The positive temperature coefficient main branch 73 and negative temperature coefficient main branch 74 can adjust multiple by current mirror.
Electric current mixing conversion circuit 105 includes positive temperature coefficient calibration parallel circuit 53, negative temperature coefficient calibrates parallel circuit 54,
Zero-temperature coefficient main branch 55 and zero-temperature coefficient calibration circuit 56；Positive temperature current calibration branch 71 is by positive temperature coefficient school
Quasi- parallel circuit 53, negative temperature correcting current branch 72 is after negative temperature coefficient calibrates parallel circuit 54 to positive temperature coefficient main branch
73 and negative temperature coefficient main branch 74 carry out mixing calibration, the principal current 77 of output is obtained by zero-temperature coefficient electrical current main branch 55
Zero-temperature coefficient principal current 79 is obtained, calibration electric current 78 obtains zero-temperature coefficient by zero-temperature coefficient electrical current calibration circuit 56 and calibrates
Electric current 80, zero-temperature coefficient principal current 79 and zero-temperature coefficient calibration electric current 80 generate different size of charging and discharging currents after mixing
81。
The capacitance shaping circuit includes two equivalent constant capacitances, two comparators and a rest-set flip-flop, and zero
Temperature coefficient current enters comparator negative terminal after charging to capacitance, comparator finally obtains clock frequency after inputting to rest-set flip-flop
Rate, the clock frequency of output are equal to I/ (2C*Vref), and wherein I is charging and discharging currents, and C is the value of capacitance, Vref for comparator just
The reference voltage at end.
It is powered using a voltage stabilizing LDO to the circuit of oscillator, avoids influence of the supply voltage to output frequency.
A kind of method for obtaining Low Drift Temperature clock frequency, using above-mentioned Low Drift Temperature oscillator, and by the following steps：
Step S1, when positive temperature coefficient absolute value is less than negative temperature coefficient absolute value, positive temperature is amplified using current mirror
Coefficient main branch 73 reduces negative temperature coefficient main branch 74；When positive temperature coefficient absolute value is less than negative temperature coefficient absolute value
When, using current mirror amplification negative temperature coefficient main branch 74 or positive temperature coefficient main branch 73 is reduced, makes Positive and Negative Coefficient Temperature electric
Stream is added close to zero；
Step S2, by the positive temperature coefficient main branch 83 of adjustment, the negative temperature coefficient main branch 82 of adjustment and positive temperature electricity
Stream calibration branch 53, negative temperature correcting current branch 54 carry out composed correction, obtain zero-temperature coefficient electrical current.
Step S3, zero-temperature coefficient electrical current is respectively by zero-temperature coefficient main branch 55 and zero-temperature coefficient calibration circuit 56
It is overlapped again afterwards and obtains different size of charging and discharging currents 81；
Step S4, charged with charging and discharging currents 81 to fixed value capacitance, by adjusting the size of charging and discharging currents 81
Obtain different Low Drift Temperature clock frequencies.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all originals in the present invention
Then with all any modification, equivalent and improvement made within spirit etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of Low Drift Temperature oscillator, it is characterised in that：Including positive temperature coefficient current generating circuit (101), negative temperature coefficient
Current generating circuit (102), electric current mixing conversion circuit (105) and capacitance shaping circuit (107), positive temperature coefficient electric current generate
Circuit (101) generates a positive temperature coefficient main branch (73) by current mirror and a positive temperature current calibrates branch (71),
Negative temperature parameter current generation circuit (102) generates a negative temperature coefficient main branch (74) and a negative temperature by current mirror
Correcting current branch (71)；Positive temperature coefficient main branch (73), positive temperature current calibration branch (71), negative temperature coefficient main branch
(74) mixed by electric current after conversion circuit (105) mixes with negative temperature correcting current branch (71) and obtain zero-temperature coefficient electrical current
(106), the constant capacitance in capacitance shaping circuit (107) is carried out after zero-temperature coefficient electrical current (106) is scaled up or down as desired
The clock frequency output (108) of different Low Drift Temperatures is obtained after charge and discharge shaping.
2. Low Drift Temperature oscillator according to claim 1, it is characterised in that：The positive temperature coefficient main branch (73) and negative
Temperature coefficient main branch (74) can adjust multiple by current mirror.
3. Low Drift Temperature oscillator according to claim 1, it is characterised in that：The electric current mixing conversion circuit (105) is wrapped
Include positive temperature coefficient calibration parallel circuit (53), negative temperature coefficient calibration parallel circuit (54), zero-temperature coefficient main branch (55) and zero
Temperature coefficient calibration circuit (56)；Positive temperature current calibration branch (71) is by positive temperature coefficient calibration parallel circuit (53), subzero temperature
Correcting current branch (72) is spent after negative temperature coefficient calibration parallel circuit (54) to positive temperature coefficient main branch (73) and subzero temperature
Degree coefficient main branch (74) carries out mixing calibration, and the principal current (77) of output is obtained by zero-temperature coefficient electrical current main branch (55)
Zero-temperature coefficient principal current (79), calibration electric current (78) obtain zero-temperature coefficient by zero-temperature coefficient electrical current calibration circuit (56)
Electric current (80) is calibrated, zero-temperature coefficient principal current (79) and zero-temperature coefficient calibration electric current (80) generate different size of after mixing
Charging and discharging currents (81).
4. Low Drift Temperature oscillator according to claim 1, it is characterised in that：The capacitance shaping circuit includes two etc.
The constant capacitance of value, two comparators and a rest-set flip-flop, zero-temperature coefficient electrical current are born after charging to capacitance into comparator
End, comparator finally obtain clock frequency after inputting to rest-set flip-flop, the clock frequency of output is equal to I/ (2C*Vref).
5. Low Drift Temperature oscillator according to claim 1, it is characterised in that：Using a voltage stabilizing LDO (50) to oscillator
Circuit power supply, avoid influence of the supply voltage to output frequency.
A kind of 6. method for obtaining Low Drift Temperature clock frequency, it is characterised in that：Using the low temperature described in one of claim 1 to 5
Oscillator is floated, and by the following steps：
Step S1, when positive temperature coefficient absolute value is less than negative temperature coefficient absolute value, positive temperature coefficient is amplified using current mirror
Main branch (73) reduces negative temperature coefficient main branch (74)；When positive temperature coefficient absolute value is less than negative temperature coefficient absolute value
When, using current mirror amplification negative temperature coefficient main branch (74) or positive temperature coefficient main branch (73) is reduced, makes positive negative temperature system
Number electric current is added close to zero；
Step S2, by the positive temperature coefficient main branch (83) of adjustment, the negative temperature coefficient main branch (82) of adjustment and positive temperature electricity
Stream calibration branch (53), negative temperature correcting current branch (54) carry out composed correction, obtain zero-temperature coefficient electrical current.
Step S3, zero-temperature coefficient electrical current is respectively by zero-temperature coefficient main branch (55) and zero-temperature coefficient calibration circuit (56)
It is overlapped again afterwards and obtains different size of charging and discharging currents (81)；
Step S4, charged with charging and discharging currents (81) to fixed value capacitance, by adjusting the size of charging and discharging currents (81)
Obtain different Low Drift Temperature clock frequencies.
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| CN201810073516.7A CN108123699B (en) | 2018-01-25 | 2018-01-25 | Low-temperature drift oscillator and method for obtaining low-temperature drift clock frequency |
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| CN201810073516.7A CN108123699B (en) | 2018-01-25 | 2018-01-25 | Low-temperature drift oscillator and method for obtaining low-temperature drift clock frequency |
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| CN108123699B CN108123699B (en) | 2021-04-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501556A (en) * | 2019-08-27 | 2019-11-26 | 上海芯旺微电子技术有限公司 | A kind of Low Drift Temperature low-voltage testing circuit for MCU |
| CN112713858A (en) * | 2020-12-22 | 2021-04-27 | 上海东软载波微电子有限公司 | Oscillator |
| CN113834578A (en) * | 2021-10-18 | 2021-12-24 | 英韧科技(上海)有限公司 | Temperature sensor circuit |
| CN114185388A (en) * | 2021-12-03 | 2022-03-15 | 四川中微芯成科技有限公司 | Temperature characteristic adjustable current module, oscillator and circuit |
| WO2023016080A1 (en) * | 2021-08-11 | 2023-02-16 | 华润微集成电路(无锡)有限公司 | High-precision clock circuit structure |
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| CN103546123A (en) * | 2013-11-01 | 2014-01-29 | 东南大学 | High-linearity relaxation oscillator |
| CN104460810A (en) * | 2014-12-25 | 2015-03-25 | 武汉众为信息技术有限公司 | Voltage reference circuit fixable in temperature coefficient |
| CN107196626A (en) * | 2017-07-11 | 2017-09-22 | 珠海晶通科技有限公司 | A kind of clock generator with temperature-compensating and with fabrication error amendment |
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| US20130314068A1 (en) * | 2011-02-18 | 2013-11-28 | University Of Electronic Science And Technology Of China | Temperature adaptive bandgap reference circuit |
| CN103532546A (en) * | 2012-07-02 | 2014-01-22 | 中芯国际集成电路制造(上海)有限公司 | Oscillator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501556A (en) * | 2019-08-27 | 2019-11-26 | 上海芯旺微电子技术有限公司 | A kind of Low Drift Temperature low-voltage testing circuit for MCU |
| CN110501556B (en) * | 2019-08-27 | 2021-06-01 | 上海芯旺微电子技术有限公司 | Low-temperature drift low-voltage detection circuit for MCU |
| CN112713858A (en) * | 2020-12-22 | 2021-04-27 | 上海东软载波微电子有限公司 | Oscillator |
| WO2023016080A1 (en) * | 2021-08-11 | 2023-02-16 | 华润微集成电路(无锡)有限公司 | High-precision clock circuit structure |
| CN113834578A (en) * | 2021-10-18 | 2021-12-24 | 英韧科技(上海)有限公司 | Temperature sensor circuit |
| CN114185388A (en) * | 2021-12-03 | 2022-03-15 | 四川中微芯成科技有限公司 | Temperature characteristic adjustable current module, oscillator and circuit |
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Address after: Room 906b, area B, 9 / F, building 1, Zhangjiang jidiangang, 3000 Longdong Avenue, Pudong New Area, Shanghai, 200120 Patentee after: Shanghai Xinwang Microelectronics Technology Co.,Ltd. Address before: Room 906b, area B, 9 / F, building 1, Zhangjiang jidiangang, 3000 Longdong Avenue, Pudong New Area, Shanghai, 200120 Patentee before: SHANGHAI CHIPON MICRO ELECTRONIC TECHNOLOGY CO.,LTD. |