CN104536501A - Low-noise current fine adjustment reference source - Google Patents
Low-noise current fine adjustment reference source Download PDFInfo
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- CN104536501A CN104536501A CN201410558873.4A CN201410558873A CN104536501A CN 104536501 A CN104536501 A CN 104536501A CN 201410558873 A CN201410558873 A CN 201410558873A CN 104536501 A CN104536501 A CN 104536501A
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- resistance
- operational amplifier
- amplifier opamp
- resistor
- voltage
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Abstract
The invention discloses a low-noise current fine adjustment reference source. The reference source comprises an operational amplifier OPAMP, a resistor R1 and a resistor R2. The ends of the resistor R1 and the resistor R2 are connected with the output end VOUT of the operational amplifier OPAMP respectively. The other end of the resistor R1 is connected with a negative feedback enable node INP of the operational amplifier OPAMP. The other end of the resistor R2 is connected with a negative feedback enable node INN of the operational amplifier OPAMP. The resistor R1 and the resistor R2 are connected in series to be connected with an emitter of a PNP type bipolar transistor Q1 and then grounded. The resistor R2 is connected with an emitter of a PNP type bipolar transistor Q2 and then grounded. Resistors R3, R4 and R5 are added on the resistor R1 current branch. Resistors R4, R6 and R8 are added on the resistor R2 current branch, and fine adjustment of the resistor R1 and the resistor R2 is completed through control signals CON1, CON2 and CON3. A chopping module MOD is arranged on the resistor R1 and resistor R2 current branch, and by switching the current on the R1 and R2 passage dynamically, noise and detuning of the current can be eliminated.
Description
Technical field
The present invention relates to a kind of object being reached adjustment output voltage by adjustment image current, the noise of current mirror and the low-noise current fine setting reference source of imbalance can be eliminated again simultaneously.
Background technology
Band gap reference is widely used in the integrated circuit such as various simulation, digital-to-analogue mixed signal and power management, and its precision directly determines the precision of whole system usually.Along with the characteristic dimension of integrated circuit constantly reduces, supply voltage constantly declines, and components and parts do not mate the Accuracy of stochastic error to Low Voltage CMOS Bandgap Reference caused and become very large.In order to obtain the reference source of output low noise, the offset voltage that technique causes effectively must be reduced.The method for designing of low imbalance mainly contains automatic zero set (AZS) technology, fine setting technology and wave chopping technology etc.Automatic zero set (AZS) technology is first sampled and keeps offset voltage, then from signal, deduct imbalance part, and realize the reduction to imbalance, this technology is mainly applicable to the discrete signal circuit such as switching capacity; Fine setting technology components and parts is being adjusted to the target arriving and eliminate imbalance; Wave chopping technology is by modulation and demodulation, and low-frequency noise and offset voltage are modulated to high frequency treatment, then eliminates its impact through filtering process.Due to the uncertain factor of technique, be generally difficult to ensure the accurate component value of card and cause imbalance, wherein resistance value deviation when technique realizes is maximum.General method is finely tuned resistance.The method of fine setting has laser tune, fuse fine setting, Zener diode fine setting and electrically programmable analog device.The method cost of these resistor trimmings is high, need take very large chip area.For this reason, we have developed a kind of object being reached adjustment output voltage by adjustment image current, can eliminate again the noise of current mirror and the low-noise current fine setting reference source of imbalance simultaneously.
Summary of the invention
For the technical matters of above-mentioned existence, the object of the invention is: propose a kind of object being reached adjustment output voltage by adjustment image current, the noise of current mirror and the low-noise current fine setting reference source of imbalance can be eliminated again simultaneously.
Technical solution of the present invention is achieved in that a kind of low-noise current fine setting reference source, comprises operational amplifier OPAMP, resistance R1, resistance R2; One end and the negative feedback of operational amplifier OPAMP of described resistance R1 make node INP be connected, and the other end is connected with the output terminal VOUT of operational amplifier OPAMP; One end and the negative feedback of operational amplifier OPAMP of described resistance R2 make node INN be connected, and the other end is connected with the output terminal VOUT of operational amplifier OPAMP; The emitter of positive-negative-positive bipolar transistor Q1 is connected to after described resistance R1 connects with resistance R0, then ground connection; Described resistance R2 is connected to the emitter of positive-negative-positive bipolar transistor Q2, then ground connection; Resistance R1 current branch increases resistance R3, R5, R7; The current branch of resistance R2 increases resistance R4, R6, R8, is completed the fine setting of resistance R1, R2 by control signal CON1, CON2, CON3, wherein CON1 controls nmos switch M1, M2; CON2 controls nmos switch M3, M4; CON3 controls nmos switch M5, M6; Resistance R1, R2 mismatch causes the branch current mismatch flowing through resistance that dynamic element matching method can be used by copped wave module MOD, electric current on switching at runtime R1, R2 passage, can eliminate noise and the imbalance of electric current, meanwhile, described copped wave module MOD reduces the input offset voltage of operational amplifier further; Described copped wave module MOD is connected with input end INN, INP of operational amplifier OPAMP, and the input as the offset voltage of operational amplifier OPAMP is modulated, and is completed separate mediation filtering in operational amplifier OPAMP inside by demodulation module DEMOD; The output terminal VOUT of described operational amplifier OPAMP controls start-up circuit module STARTUP, and feedback link is to the emitter of positive-negative-positive bipolar transistor Q2.
Preferably, the negative feedback of described operational amplifier OPAMP makes the voltage of node INN, INP equal, and resistance R1, R2 are equal, and the branch current flowing through two resistance is also equal, and the voltage on resistance R0 is △ V
bE=V
bE2-V
bE1so, △ V
bE=V
tlnn, on resistance R0, electric current is I0=V
tlnn/R0, wherein, V
bE1for the voltage between the base stage of positive-negative-positive bipolar transistor Q1 and emitter, V
bE2for the voltage between the base stage of positive-negative-positive bipolar transistor Q2 and emitter, the base stage of Q1, Q2 and collector are connected to diode form, V
tfor thermal voltage, n is Q1 emitter area and the ratio of Q2 emitter area; So the output voltage of operational amplifier OPAMP is: VOUT=V
bE2+ V
tlnn (R2/R0), only has resistance R1, R2 equal and node INN, INP voltage is equal, and the output VOUT of described operational amplifier OPAMP is accurate.
Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:
Low-noise current fine setting reference source of the present invention reaches the object of adjustment output voltage by adjustment image current, can eliminate again noise and the imbalance of current mirror simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Accompanying drawing 1 is the circuit theory diagrams of low-noise current of the present invention fine setting reference source.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described.
Be low-noise current of the present invention fine setting reference source as shown in Figure 1, comprise operational amplifier OPAMP, resistance R1, resistance R2; One end and the negative feedback of operational amplifier OPAMP of described resistance R1 make node INP be connected, and the other end is connected with the output terminal VOUT of operational amplifier OPAMP; One end and the negative feedback of operational amplifier OPAMP of described resistance R2 make node INN be connected, and the other end is connected with the output terminal VOUT of operational amplifier OPAMP; The emitter of positive-negative-positive bipolar transistor Q1 is connected to after described resistance R1 connects with resistance R0, then ground connection; Described resistance R2 is connected to the emitter of positive-negative-positive bipolar transistor Q2, then ground connection; The negative feedback of described operational amplifier OPAMP makes the voltage of node INN, INP equal, and resistance R1, R2 are equal, and the branch current flowing through two resistance is also equal, and the voltage on resistance R0 is △ V
bE=V
bE2-V
bE1so, △ V
bE=V
tlnn, on resistance R0, electric current is I0=V
tlnn/R0, wherein, V
bE1for the voltage between the base stage of positive-negative-positive bipolar transistor Q1 and emitter, V
bE2for the voltage between the base stage of positive-negative-positive bipolar transistor Q2 and emitter, the base stage of Q1, Q2 and collector are connected to diode form, V
tfor thermal voltage, n is Q1 emitter area and the ratio of Q2 emitter area; So the output voltage of operational amplifier OPAMP is: VOUT=V
bE2+ V
tlnn (R2/R0).Only have resistance R1, R2 equal and node INN, INP voltage is equal, export VOUT accurate.Due to the components and parts mismatch that IC technique causes, there is offset voltage in operational amplifier OPAMP, is also difficult to ensure accurate resistance value.The absolute precision of reference source output voltage is a very important index, needs to finely tune the value of resistance R1, R2; Resistance R1 current branch increases resistance R3, R5, R7; The current branch of resistance R2 increases resistance R4, R6, R8, is completed the fine setting of resistance R1, R2 by control signal CON1, CON2, CON3.Wherein CON1 controls nmos switch M1, M2; CON2 controls nmos switch M3, M4; CON3 controls nmos switch M5, M6; Resistance R1, R2 mismatch causes the branch current mismatch flowing through resistance that dynamic element matching method can be used by copped wave module MOD, electric current on switching at runtime R1, R2 passage, can eliminate noise and the imbalance of electric current, meanwhile, described copped wave module MOD reduces the input offset voltage of operational amplifier further.Described copped wave module MOD is connected with input end INN, INP of operational amplifier OPAMP, and the input as the offset voltage of operational amplifier OPAMP is modulated, and is completed separate mediation filtering in operational amplifier OPAMP inside by demodulation module DEMOD; The output terminal VOUT of described operational amplifier OPAMP controls start-up circuit module STARTUP, and feedback link is to the emitter of positive-negative-positive bipolar transistor Q2.
Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:
Low-noise current fine setting reference source of the present invention reaches the object of adjustment output voltage by adjustment image current, can eliminate again noise and the imbalance of current mirror simultaneously.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and be implemented; can not limit the scope of the invention with this; all equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (2)
1. a low-noise current fine setting reference source, comprises operational amplifier OPAMP, resistance R1, resistance R2; One end and the negative feedback of operational amplifier OPAMP of described resistance R1 make node INP be connected, and the other end is connected with the output terminal VOUT of operational amplifier OPAMP; One end and the negative feedback of operational amplifier OPAMP of described resistance R2 make node INN be connected, and the other end is connected with the output terminal VOUT of operational amplifier OPAMP; The emitter of positive-negative-positive bipolar transistor Q1 is connected to after described resistance R1 connects with resistance R0, then ground connection; Described resistance R2 is connected to the emitter of positive-negative-positive bipolar transistor Q2, then ground connection; It is characterized in that: in resistance R1 current branch, increase resistance R3, R5, R7; The current branch of resistance R2 increases resistance R4, R6, R8, is completed the fine setting of resistance R1, R2 by control signal CON1, CON2, CON3, wherein CON1 controls nmos switch M1, M2; CON2 controls nmos switch M3, M4; CON3 controls nmos switch M5, M6; Resistance R1, R2 mismatch causes the branch current mismatch flowing through resistance that dynamic element matching method can be used by copped wave module MOD, electric current on switching at runtime R1, R2 passage, can eliminate noise and the imbalance of electric current, meanwhile, described copped wave module MOD reduces the input offset voltage of operational amplifier further; Described copped wave module MOD is connected with input end INN, INP of operational amplifier OPAMP, and the input as the offset voltage of operational amplifier OPAMP is modulated, and is completed separate mediation filtering in operational amplifier OPAMP inside by demodulation module DEMOD; The output terminal VOUT of described operational amplifier OPAMP controls start-up circuit module STARTUP, and feedback link is to the emitter of positive-negative-positive bipolar transistor Q2.
2. low-noise current fine setting reference source according to claim 1, it is characterized in that: the negative feedback of described operational amplifier OPAMP makes the voltage of node INN, INP equal, resistance R1, R2 are equal, and the branch current flowing through two resistance is also equal, and the voltage on resistance R0 is △ V
bE=V
bE2-V
bE1so, △ V
bE=V
tln n, on resistance R0, electric current is I0=V
tln n/R0, wherein, V
bE1for the voltage between the base stage of positive-negative-positive bipolar transistor Q1 and emitter, V
bE2for the voltage between the base stage of positive-negative-positive bipolar transistor Q2 and emitter, the base stage of Q1, Q2 and collector are connected to diode form, V
tfor thermal voltage, n is Q1 emitter area and the ratio of Q2 emitter area; So the output voltage of operational amplifier OPAMP is: VOUT=V
bE2+ V
tln n (R2/R0), only has resistance R1, R2 equal and node INN, INP voltage is equal, and the output VOUT of described operational amplifier OPAMP is accurate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410558873.4A CN104536501B (en) | 2014-10-20 | 2014-10-20 | A kind of low-noise current fine setting reference source |
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|---|---|---|---|
| CN201410558873.4A CN104536501B (en) | 2014-10-20 | 2014-10-20 | A kind of low-noise current fine setting reference source |
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|---|---|
| CN104536501A true CN104536501A (en) | 2015-04-22 |
| CN104536501B CN104536501B (en) | 2016-04-20 |
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Citations (7)
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|---|---|---|---|---|
| US6462612B1 (en) * | 2001-06-28 | 2002-10-08 | Intel Corporation | Chopper stabilized bandgap reference circuit to cancel offset variation |
| CN102200796A (en) * | 2010-03-25 | 2011-09-28 | 上海沙丘微电子有限公司 | Band-gap reference source circuit with stable low-offset and low-noise noise chopped wave |
| CN202075655U (en) * | 2011-01-26 | 2011-12-14 | 武汉光华芯科技有限公司 | Band gap reference voltage source circuit with chopping low temperature coefficient |
| CN102323848A (en) * | 2011-07-27 | 2012-01-18 | 江苏物联网研究发展中心 | Band-gap reference circuit capable of eliminating offset influence by chopping technology |
| TW201239573A (en) * | 2011-03-30 | 2012-10-01 | Global Unichip Corp | Bandgap reference circuit |
| 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 |
| CN204331522U (en) * | 2014-10-20 | 2015-05-13 | 苏州市职业大学 | A kind of low-noise current fine setting reference source |
-
2014
- 2014-10-20 CN CN201410558873.4A patent/CN104536501B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6462612B1 (en) * | 2001-06-28 | 2002-10-08 | Intel Corporation | Chopper stabilized bandgap reference circuit to cancel offset variation |
| CN102200796A (en) * | 2010-03-25 | 2011-09-28 | 上海沙丘微电子有限公司 | Band-gap reference source circuit with stable low-offset and low-noise noise chopped wave |
| CN202075655U (en) * | 2011-01-26 | 2011-12-14 | 武汉光华芯科技有限公司 | Band gap reference voltage source circuit with chopping low temperature coefficient |
| TW201239573A (en) * | 2011-03-30 | 2012-10-01 | Global Unichip Corp | Bandgap reference circuit |
| CN102323848A (en) * | 2011-07-27 | 2012-01-18 | 江苏物联网研究发展中心 | Band-gap reference circuit capable of eliminating offset influence by chopping technology |
| 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 |
| CN204331522U (en) * | 2014-10-20 | 2015-05-13 | 苏州市职业大学 | A kind of low-noise current fine setting reference source |
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| Publication number | Publication date |
|---|---|
| CN104536501B (en) | 2016-04-20 |
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