CN102200796A - Band-gap reference source circuit with stable low-offset and low-noise noise chopped wave - Google Patents
Band-gap reference source circuit with stable low-offset and low-noise noise chopped wave Download PDFInfo
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- CN102200796A CN102200796A CN2010101326486A CN201010132648A CN102200796A CN 102200796 A CN102200796 A CN 102200796A CN 2010101326486 A CN2010101326486 A CN 2010101326486A CN 201010132648 A CN201010132648 A CN 201010132648A CN 102200796 A CN102200796 A CN 102200796A
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Abstract
The invention provides a band-gap reference source circuit with a stable low-offset and low-noise noise chopped wave, comprising an operational amplifier, a transistor arranged in the form of a mirror image and a divider resistor, wherein a modulator is connected in front of an input end of the operational amplifier while an output end of the operational amplifier is connected with a demodulator; an output end of the demodulator is connected with an input end of a RC low-pass filter; an output end of the RC low-pass filter is connected with an input end of a buffer; a transmission gate circuit is connected between two input ends of the buffer; another input end of the buffer is connected with an input end of another RC low-pass filter; and an output end of the RC low-pass filter is connected with an output end of the buffer. By using the invention, a signal is modulated at the input end of the operational amplifier and demodulated at the output end. The demodulated input signal is recovered while an equivalent offset voltage and 1/F noise are modulated to a high frequency and then filtered by the low-pass filter, thereby reducing or even eliminating the influences of the offset voltage and the 1/F noise on the precision and successfully solving the phenomenon of low output voltage precision caused by the offset voltage of the operational amplifier.
Description
[technical field]
The present invention relates to the band-gap reference source circuit in the extensive Analogous Integrated Electronic Circuits design field, particularly a kind of band-gap reference source circuit of low imbalance low noise chopped wave stabilizing.
[background technology]
Fig. 1 is typical band-gap reference functional structure chart, and by PNP transistor Q1, Q2, resistance R 1, R2, R3, operational amplifier A MP form, wherein the emitting stage area of PNP transistor Q1 be transistor Q2 n doubly, Vos is an offset voltage.
In above-mentioned traditional band-gap reference circuit, produce a feedback control loop reference voltage by amplifier.Feedback control loop keeps two input end node voltages of operational amplifier to equate, resistance R 2=R3 makes the electric current that flows through PNP transistor Q1 and Q2 equate.Because the emitting stage area of transistor Q1 is n times of Q2, on resistance R 1, can produce the voltage of Δ Vbe.Because the PN junction voltage of forward conduction has negative temperature coefficient, and Δ Vbe is positive temperature coefficient, so, can obtain temperature independent reference voltage by suitably regulating parameter.Ideally, offset voltage does not as shown in Figure 1 exist.But because the imbalance of amplifier system, the mismatch of device and produce imbalance.Output reference voltage is:
Wherein vbe2 is that the emitter and the base voltage of PNP transistor 2 are the voltage of node NB to ground, and VT is thermal voltage (equaling KT/q), and n is the ratio of PNP transistor Q1 and Q2 emitter area, and Vos is an offset voltage.Can see that from the above-mentioned relation formula imbalance of amplifier has been exaggerated R3/R1 doubly.And the offset voltage of amplifier changes with the variation of temperature and technology, so output voltage V out also has very big variation.Obviously can not meet the demands under the high-accuracy voltage situation for requiring like this.
[summary of the invention]
Technical matters to be solved by this invention is to overcome existing defective in the above-mentioned prior art, and a kind of band-gap reference source circuit of low imbalance low noise chopped wave stabilizing is provided.
The present invention has adopted following technical proposal to solve its technical matters: a kind of band-gap reference source circuit of low imbalance low noise chopped wave stabilizing, comprise an operational amplifier, two transistor and divider resistances that mirror image is provided with, the first transistor of this mirror image setting and the base stage of transistor seconds and collector are connected the ground end of signal jointly, the emitter of the first transistor, the collector and first resistance, second resistance is connected in series, the output terminal of the other end concatenation operation amplifier of second resistance, the emitter of transistor seconds, collector and the 3rd resistance are connected in series, the output terminal of the other end concatenation operation amplifier of the 3rd resistance, first resistance, the common port concatenation operation amplifier inverting input of second resistance, the common port concatenation operation amplifier normal phase input end of the emitter of transistor seconds and the 3rd resistance, it is characterized in that: first, the common port of two resistance, transistor seconds emitter and the common port of the 3rd resistance are connected the input end of modulator respectively, two output terminals of this modulator are the concatenation operation amplifier input terminal respectively, operational amplifier two output terminals connect the detuner input end respectively, the output terminal of this detuner connects the input end of a RC low-pass filter, the output terminal of this RC low-pass filter connects the input end of an impact damper, be connected a transmission gate circuit between another input end of this input end and impact damper, another input end of impact damper also is connected with the input end of another RC low-pass filter, and the output terminal of this RC low-pass filter is connected with the output terminal of impact damper.
The present invention has adopted operational amplifier chopped wave stabilizing principle, eliminates the equivalence imbalance and the 1/f noise of amplifier input end.At the amplifier input end input signal is modulated, and operational amplifier input end equivalent noise and offset voltage are not modulated.At the output terminal of amplifier, signal is carried out demodulation.After the demodulation, equivalent input noise voltage and 1/f noise that input signal recovers operational amplifier then are modulated onto high frequency, then by the low pass filter filters out radio-frequency component, thereby reduce even eliminate the influence to precision of offset voltage and 1/f noise.The present invention has successfully solved band gap reference because the low phenomenon of output voltage precision that the offset voltage of operational amplifier causes, and makes the 1/f noise of operational amplifier to reduce, and output voltage is more accurate, and output ripple is littler.
[description of drawings]
Fig. 1 is traditional band-gap reference circuit structural representation;
Fig. 2 is the band gap reference electrical block diagram of the low imbalance of the present invention low noise chopped wave stabilizing;
Fig. 3 is the circuit structure block diagram of modulator among the present invention;
Fig. 4 is the circuit structure block diagram of detuner among the present invention;
Fig. 5 is buffer circuit configuration synoptic diagram among the present invention.
Each sequence number is expressed as respectively among the figure:
Vos-offset voltage AMP-operational amplifier
The Q1-the first transistor; The Q2-transistor seconds;
The NA-node; The NB-node
R1-first resistance; R2-second resistance;
R3-the 3rd resistance; R4-resistance;
R5-resistance; C1-electric capacity;
C2-electric capacity; The 6-modulator;
The 7-operational amplifier; The 8-detuner;
The 9-transmission gate; The 10-impact damper;
The N1-node; The N2-node.
[embodiment]
The invention will be further described below in conjunction with embodiment and accompanying drawing.
With reference to Fig. 2, the present invention includes the first transistor Q1 and transistor seconds Q2 that 7, two mirror images of an operational amplifier are provided with, divider resistance is R1, R2, R3, wherein the resistance of resistance R 2 and R3 is identical.
Above-mentioned first, transistor seconds Q1, the base stage of Q2 and collector are connected the ground end of signal jointly, the emitter of the first transistor Q1, the collector and first resistance R 1, second resistance R 2 is connected in series, the output terminal of the other end concatenation operation amplifier 7 of second resistance R 2, the emitter of transistor seconds Q2, collector and the 3rd resistance R 3 are connected in series, the output terminal of the other end concatenation operation amplifier 7 of the 3rd resistance R 3, first resistance R 1, the inverting input of the common port concatenation operation amplifier 7 of second resistance R 2, common port concatenation operation amplifier 7 normal phase input ends of the emitter of transistor seconds Q2 and the 3rd resistance R 3.
The technology of the present invention feature also is: first, two resistance R 1, the common port of R2, transistor seconds Q2 emitter and the common port of the 3rd resistance R 3 are connected the input end of modulator 6 respectively, two output terminals of this modulator 6 are the input end of concatenation operation amplifier 7 respectively, 7 liang of output terminals of operational amplifier connect detuner 8 input ends respectively, the output terminal of this detuner 8 connects the input end of a RC low-pass filter that is made of resistance R 4 and capacitor C 1, the output terminal of this RC low-pass filter connects the input end of an impact damper 10, be connected a transmission gate circuit 9 between another input end of this input end and impact damper 10, another input end of this impact damper 10 also is connected with the input end of another RC low-pass filter that is made of resistance R 5 and capacitor C 2, and the output terminal of this RC low-pass filter is connected with the output terminal of impact damper 10.
The dutycycle of the high-frequency square-wave signal of modulator 6 is 50%, when high-frequency square-wave signal is high level, and on-off circuit 1, on-off circuit 4 conductings, on-off circuit 2, on-off circuit 3 end, Input1 and Output1, Input2 is connected with Output2; When high-frequency square-wave signal is low level, on-off circuit 2 and on-off circuit 3 conductings, on-off circuit 1 ends with on-off circuit 4, Input1 and Output2, Input2 is connected with Output1.
The similar modulator 6 of the principle of work of detuner 8, when its high-frequency square-wave signal is high level, on-off circuit 1 conducting, on-off circuit 2 ends, Input1 and Output conducting output; When high-frequency signal is low level, on-off circuit 2 conductings, on-off circuit 1 ends, Input2 and Output conducting output.
Because said modulator 6, detuner 8, transmission gate circuit 9, impact damper 10, operational amplifier 7 all are prior aries, the same domain those of ordinary skill all can be known its principle and feature, so this paper repeats no more.
Below the principle of work of the band-gap reference source circuit of low imbalance low noise chopped wave stabilizing of the present invention briefly is described below:
The output signal of operational amplifier 7 passes to detuner 8.The control signal of detuner 8 and modulator 6 is that modulation and demodulation signal (chopping signal) is same square-wave signal.The high flat part of the signal of operational amplifier 7 output is demodulated into baseband signal, and promptly the signal of modulate through modulator 6 is after amplifying, again by reverting to the signal of frequency equally after detuner 8 demodulation.That part of offset voltage and the 1/f noise voltage that does not have modulated device to modulate is modulated to high frequency by detuner 8, at the output generation high frequency noise of modulator 8.The output terminal of modulator 8 is equipped with by resistance R 4 and capacitor C 1, and resistance R 5 and capacitor C 2 are formed two groups of low-pass filters, leach high frequency noise.And be to have added a transmission gate 9 between node N1 and the N2 between two wave filters.
Because baseband frequency is lower, simultaneously owing to requiring reference voltage that very little ripple voltage is arranged, so require low-pass filter capacitance bigger.As wave filter, filtering goes out high frequency noise on the one hand; Playing good pressure stabilization function on the other hand, is the outer electric capacity of sheet so select capacitor C 2.
Because electric capacity is bigger, make circuit very slow to the electric capacity charging in the process of opening again, so increase by an impact damper 10 between node N1 and N2, it is started working at circuit, and moment at initial stage, outer electric capacity C2 charged to sheet.Promptly open the initial stage when circuit, transmission gate 9 is opened, and node N1 and N2 disconnect, and impact damper 10 is capacitor C 2 chargings.When electric capacity is charged to when the same with the N1 point voltage, transmission gate 9 is opened, N1 and N2 connection, and impact damper 10 cuts out, and the entire circuit operate as normal is for the outside provides the stable low noise reference voltage of low imbalance.
The above analysis, the present invention can effectively reduce offset voltage and 1/f noise, improves the precision and the stability of reference voltage.The present invention well solved traditional band-gap reference insurmountable low precision and when load variations is big the bigger problem of output voltage ripple.
Claims (3)
1. the band-gap reference source circuit of one kind low imbalance low noise chopped wave stabilizing, comprise an operational amplifier, two transistor and divider resistances that mirror image is provided with, the first transistor of this mirror image setting and the base stage of transistor seconds and collector are connected the ground end of signal jointly, the emitter of the first transistor, the collector and first resistance, second resistance is connected in series, the output terminal of the other end concatenation operation amplifier of second resistance, the emitter of transistor seconds, collector and the 3rd resistance are connected in series, the output terminal of the other end concatenation operation amplifier of the 3rd resistance, first resistance, the common port concatenation operation amplifier inverting input of second resistance, the common port concatenation operation amplifier normal phase input end of the emitter of transistor seconds and the 3rd resistance, it is characterized in that: first, the common port of two resistance, transistor seconds emitter and the common port of the 3rd resistance are connected the input end of modulator respectively, two output terminals of this modulator are the concatenation operation amplifier input terminal respectively, operational amplifier two output terminals connect the detuner input end respectively, the output terminal of this detuner connects the input end of a RC low-pass filter, the output terminal of this RC low-pass filter connects the input end of an impact damper, be connected a transmission gate circuit between another input end of this input end and impact damper, another input end of impact damper also is connected with the input end of another RC low-pass filter, and the output terminal of this RC low-pass filter is connected with the output terminal of impact damper.
2. the band-gap reference source circuit of a kind of low imbalance low noise chopped wave stabilizing according to claim 1 is characterized in that: modulator, detuner can be made of the on-off circuit that metal-oxide-semiconductor is formed.
3. the band-gap reference source circuit of a kind of low imbalance low noise chopped wave stabilizing according to claim 1 is characterized in that: impact damper is by the metal-oxide-semiconductor forming circuit.
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| CN2010101326486A CN102200796A (en) | 2010-03-25 | 2010-03-25 | Band-gap reference source circuit with stable low-offset and low-noise noise chopped wave |
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| CN2010101326486A CN102200796A (en) | 2010-03-25 | 2010-03-25 | Band-gap reference source circuit with stable low-offset and low-noise noise chopped wave |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103488232A (en) * | 2013-09-30 | 2014-01-01 | 深圳市芯海科技有限公司 | Chopping band-gap reference circuit based on CMOS process and reference voltage chip |
| CN103869867A (en) * | 2014-03-04 | 2014-06-18 | 芯原微电子(上海)有限公司 | Chopped wave band-gap reference circuit |
| CN103970173A (en) * | 2014-05-15 | 2014-08-06 | 无锡中星微电子有限公司 | Bandgap reference voltage circuit |
| CN104007777A (en) * | 2013-02-27 | 2014-08-27 | 中兴通讯股份有限公司 | Current source generator |
| CN104111684A (en) * | 2014-07-14 | 2014-10-22 | 深圳市科创达微电子有限公司 | Switch control band-gap reference circuit with low offset voltage |
| CN104238614A (en) * | 2014-09-03 | 2014-12-24 | 李倩 | Reference voltage circuit |
| CN104536501A (en) * | 2014-10-20 | 2015-04-22 | 苏州市职业大学 | Low-noise current fine adjustment reference source |
| CN105353817A (en) * | 2015-11-03 | 2016-02-24 | 南京天易合芯电子有限公司 | Low-noise reference circuit applicable to high-precision analog-to-digital converter (ADC) |
| CN111445865A (en) * | 2020-04-02 | 2020-07-24 | 深圳能芯半导体有限公司 | Output voltage precision control circuit and precision control method applied to AMO L ED display |
| CN112181038A (en) * | 2020-10-20 | 2021-01-05 | 大唐恩智浦半导体有限公司 | Band-gap reference circuit for inhibiting ripples |
| CN112947659A (en) * | 2021-02-22 | 2021-06-11 | 北京迪浩永辉技术有限公司 | Band-gap voltage reference circuit applied to 1/f noise of MEMS (micro-electromechanical systems) inertial device |
| CN113484788A (en) * | 2021-07-14 | 2021-10-08 | 安徽聆思智能科技有限公司 | Reference voltage source test system, reference voltage source circuit and chip |
| CN114637361A (en) * | 2020-12-16 | 2022-06-17 | 圣邦微电子（北京）股份有限公司 | Constant-temperature parallel voltage reference source |
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| CN201673425U (en) * | 2010-03-25 | 2010-12-15 | 上海沙丘微电子有限公司 | Low-detuning and low-noise band-gap reference source circuit with stable chopped wave |
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| JPH0659751A (en) * | 1992-08-13 | 1994-03-04 | Matsushita Electric Works Ltd | Band gap reference voltage adjustment circuit |
| JPH1127095A (en) * | 1997-07-04 | 1999-01-29 | Toshiba Corp | Low-pass filter circuit |
| US6462612B1 (en) * | 2001-06-28 | 2002-10-08 | Intel Corporation | Chopper stabilized bandgap reference circuit to cancel offset variation |
| CN101458540A (en) * | 2007-12-14 | 2009-06-17 | 凌阳科技股份有限公司 | Band-gap reference voltage circuit |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007777A (en) * | 2013-02-27 | 2014-08-27 | 中兴通讯股份有限公司 | Current source generator |
| WO2014131311A1 (en) * | 2013-02-27 | 2014-09-04 | 中兴通讯股份有限公司 | Current source generator |
| CN104007777B (en) * | 2013-02-27 | 2016-06-15 | 中兴通讯股份有限公司 | A kind of current source generator |
| CN103488232A (en) * | 2013-09-30 | 2014-01-01 | 深圳市芯海科技有限公司 | Chopping band-gap reference circuit based on CMOS process and reference voltage chip |
| CN103869867A (en) * | 2014-03-04 | 2014-06-18 | 芯原微电子(上海)有限公司 | Chopped wave band-gap reference circuit |
| CN103869867B (en) * | 2014-03-04 | 2015-06-03 | 芯原微电子(上海)有限公司 | Chopped wave band-gap reference circuit |
| CN103970173A (en) * | 2014-05-15 | 2014-08-06 | 无锡中星微电子有限公司 | Bandgap reference voltage circuit |
| CN104111684A (en) * | 2014-07-14 | 2014-10-22 | 深圳市科创达微电子有限公司 | Switch control band-gap reference circuit with low offset voltage |
| CN104238614A (en) * | 2014-09-03 | 2014-12-24 | 李倩 | Reference voltage circuit |
| CN104536501B (en) * | 2014-10-20 | 2016-04-20 | 苏州市职业大学 | A kind of low-noise current fine setting reference source |
| CN104536501A (en) * | 2014-10-20 | 2015-04-22 | 苏州市职业大学 | Low-noise current fine adjustment reference source |
| CN105353817A (en) * | 2015-11-03 | 2016-02-24 | 南京天易合芯电子有限公司 | Low-noise reference circuit applicable to high-precision analog-to-digital converter (ADC) |
| CN105353817B (en) * | 2015-11-03 | 2018-02-16 | 南京天易合芯电子有限公司 | A kind of low noise reference circuit suitable for high-precision adc |
| CN111445865A (en) * | 2020-04-02 | 2020-07-24 | 深圳能芯半导体有限公司 | Output voltage precision control circuit and precision control method applied to AMO L ED display |
| CN111445865B (en) * | 2020-04-02 | 2022-06-14 | 深圳能芯半导体有限公司 | Output voltage precision control circuit and precision control method applied to AMOLED display |
| CN112181038A (en) * | 2020-10-20 | 2021-01-05 | 大唐恩智浦半导体有限公司 | Band-gap reference circuit for inhibiting ripples |
| CN114637361A (en) * | 2020-12-16 | 2022-06-17 | 圣邦微电子（北京）股份有限公司 | Constant-temperature parallel voltage reference source |
| CN114637361B (en) * | 2020-12-16 | 2024-03-26 | 圣邦微电子（北京）股份有限公司 | Constant-temperature parallel voltage reference source |
| CN112947659A (en) * | 2021-02-22 | 2021-06-11 | 北京迪浩永辉技术有限公司 | Band-gap voltage reference circuit applied to 1/f noise of MEMS (micro-electromechanical systems) inertial device |
| CN112947659B (en) * | 2021-02-22 | 2022-04-12 | 北京迪浩永辉技术有限公司 | Band-gap voltage reference circuit applied to 1/f noise of MEMS (micro-electromechanical systems) inertial device |
| CN113484788A (en) * | 2021-07-14 | 2021-10-08 | 安徽聆思智能科技有限公司 | Reference voltage source test system, reference voltage source circuit and chip |
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Application publication date: 20110928 |