CN208969535U - A kind of band-gap reference circuit - Google Patents
A kind of band-gap reference circuit Download PDFInfo
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- CN208969535U CN208969535U CN201920034512.8U CN201920034512U CN208969535U CN 208969535 U CN208969535 U CN 208969535U CN 201920034512 U CN201920034512 U CN 201920034512U CN 208969535 U CN208969535 U CN 208969535U
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Abstract
The utility model discloses a kind of band-gap reference circuits, comprising: positive feedback loop, negative feedback loop and emitter follow circuit；The positive feedback loop includes transistor M1, operational amplifier OP1, transistor M3 and operational amplifier OP2；The negative feedback loop includes transistor M2, operational amplifier OP1, transistor M3 and operational amplifier OP2；The utility model uses double operational structure, the set of positive feedback and negative-feedback is utilized, while following circuit to ensure that entire circuit is in negative-feedback using emitter, improves the power supply rejection ratio and stability of circuit；In addition, the utility model structure is simple, lowers the area occupied of domain, reduce process costs, improve integrated level.
Description
Technical field
The utility model relates to technical field of integrated circuits, more particularly to a kind of band-gap reference circuit.
Background technique
Reference voltage source is a very important module in Analogous Integrated Electronic Circuits, and an effective reference voltage source exists
It is substantially unrelated with mains voltage variations, changes in process parameters, temperature change etc. in a certain range.With technique for temperature compensation,
The development of the technologies such as laser amendment, makes the performance of bandgap voltage reference be continuously available raising；It is rapidly developed in CMOS technology
Today, bandgap voltage reference technology also obtain rapid development.Thus bandgap voltage reference is widely used in DC-DC
In conversion, RF circuit, effect of a reference source in the mixed signal circuits such as analog-digital converter (ADC) and digital analog converter (DAC)
It is bigger, it is the important determinant of the converter accuracy, precision must be better than the precision of ADC itself, otherwise can be serious
Influence the performance of ADC.Therefore, high-precision, high stability voltage reference circuit have in the design of modern composite signal integrated circuits
There is indispensable status.
Band gap reference is that supply voltage is converted into unrelated reference voltage approximate with temperature and supply voltage, effect
It essentially consists in other modules into circuit and stable biasing and reference voltage is provided.The stability of reference voltage is directly related to
The working condition of electric current.Traditional band-gap reference source circuit is to utilize two triodes of the work under different current densities, it
Base-emitter voltage difference with absolute temperature is proportional, and transistor base-emitter power supply and absolute temperature are at anti-
Than just having obtained and temperature using will have the voltage of positive temperature coefficient to be added with the voltage of negative temperature coefficient with suitable weight
Spend unrelated output voltage.
Wherein measuring one of the major parameter of band-gap reference source circuit is power supply rejection ratio (PSRR), it is reflected when electricity
When there is noise in source and fluctuates, benchmark output quantity is influenced by power-supply fluctuation.In the prior art, traditional band gap reference knot
The low frequency PSRR maximum of structure is up to 70dB or so, and intermediate frequency and high frequency PSRR are often as low as 20dB or so, in some instances it may even be possible to lower；
This brings big inconvenience to application.
Therefore, how to design a kind of high PSRR band-gap reference source circuit is those skilled in the art's urgent need to resolve
Problem.
Utility model content
In view of this, the present invention provides a kind of band-gap reference circuit with high PSRR, the band gap bases
Quasi- circuit uses double operational structure, while the raising of power supply rejection ratio is realized using positive feedback and negative-feedback.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of band-gap reference circuit, comprising: positive feedback loop, negative feedback loop and emitter follow circuit；
The positive feedback loop includes transistor M1, operational amplifier OP1, transistor M3 and operational amplifier OP2；It is described
Negative feedback loop includes transistor M2, operational amplifier OP1, transistor M3 and operational amplifier OP2；
The source electrode of the transistor M1, the transistor M2 and the transistor M3 are connected with supply voltage VDD, institute
The drain electrode for stating transistor M1 is connected with the inverting input terminal of the operational amplifier OP1, the drain electrode of the transistor M2 with it is described
The normal phase input end of operational amplifier OP1 is connected, the grid phase of the output end of the operational amplifier OP1 and the transistor M3
Even, the drain electrode of the transistor M3 is connected with the inverting input terminal of the operational amplifier OP2, the operational amplifier OP2's
Normal phase input end is connected with the transistor M1, and the output end of the operational amplifier OP2 connects the grid of the transistor M1
With the grid of the transistor M2；
The grid of the transistor M1 connects the grid of the transistor M2；
It includes the emitter and the resistance of triode Q2 and resistance R2, the triode Q2 that the emitter, which follows circuit,
One end of R2 is connected, and the collector of the triode Q2 is connect with the normal phase input end of the operational amplifier OP1, three pole
The base stage of pipe is connect with the inverting input terminal of the operational amplifier OP2, the other end ground connection of the resistance R2.
It preferably, further include compensation circuit, first compensation circuit of compensation circuit and the second compensation circuit；
First compensation circuit includes capacitor C1 and capacitor C2, and second compensation circuit includes capacitor C3 and resistance
R3；
One end of the capacitor C1 is connected with the drain electrode of the transistor M1, and the other end is with the operational amplifier OP2's
Output end is connected with one end of the capacitor C2, the other end of the capacitor C2 and the transistor M2 and the operational amplifier
The positive input of OP1 is connected；
One end of the capacitor C3 is connected with the grid of the output end of the operational amplifier OP1 and the transistor M3,
The other end is connected with the resistance R3, and the other end of the resistance R3 connects the base stage of the triode Q2.
It preferably, further include triode Q1, the base stage of the triode Q1 is connected with the base stage of the triode Q2, described
The collector of triode Q1 is connected with the drain electrode of the transistor M1, the emitter ground connection of the triode Q1.
Preferably, triode Q1 and resistance Q2 passes through resistance R1 and is grounded.
Preferably, reference voltage V is accessed in the drain electrode of the transistor M3ref。
Preferably, the transistor M1, the transistor M2 and the transistor M3 are p-type MOS transistor.
Preferably, the triode Q1 and triode Q2 is NPN triode；The triode Q1 and three pole
The emitter area ratio of pipe Q2 is 1:N, and N is integer.
It can be seen via above technical scheme that compared with prior art, the utility model, which discloses, provides a kind of band gap base
Quasi- circuit；
(1) the utility model uses the set of positive feedback and negative-feedback, improves the overall stability of circuit, while benefit
It follows circuit to generate big resistance with emitter, guarantees that negative-feedback is greater than positive feedback, and then ensure that entire circuit is in negative-feedback,
The advantages of being provided with two kinds of feedbacks simultaneously, further improves the power supply rejection ratio and stability of circuit；
(2) circuit structure of the utility model is simple, can substantially reduce chip area, has saved process costs, improves collection
Cheng Du.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 attached drawing is structural schematic diagram provided by the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The utility model embodiment discloses a kind of band-gap reference circuit, as shown in Figure 1, comprising: transistor M1, M2,
M3；Triode Q1, Q2；Operational amplification circuit OP1, OP2；Resistance R1, R2, R3；Capacitor C1, C2, C3.
Wherein, the source electrode of transistor M1, M2, M3 connects supply voltage VDD, the grid connection transistor M2's of transistor M1
The output end of grid, one end of capacitor C1, C2 and operational amplifier OP2；The drain electrode connection capacitor C1's of transistor M1 is another
The collector at end, the positive input of operational amplifier OP2, the reverse input end of operational amplifier OP1 and triode Q1；Three
The base stage of base stage connecting triode Q2, the reverse input end of operational amplifier OP2, one end of resistance R3 and the crystal of pole pipe Q1
The drain electrode of pipe M3；One end of the emitter connection resistance R2 of triode Q1 and one end of resistance R1, the other end of resistance R1
Ground connection, the emitter of the other end connecting triode Q2 of resistance R2；The other end of the drain electrode connection capacitor C2 of transistor M2, operation
The positive input end of amplifier OP1 and the collector of triode Q2；The output end of operational amplifier OP1 connects transistor M3
Grid and capacitor C3 one end, capacitor C3 the other end connection resistance R3 the other end；The drain electrode of transistor M3 is as band
The output end outputting reference voltage of gap reference circuit.
Two of them operational amplifier forms two feedback loops, all the way positive feedback, and negative-feedback all the way improves the whole of circuit
Body stability.Feed circuit operational process is as follows:
A point voltage increases, and the output end voltage of operational amplifier OP1 reduces, then the grid voltage of metal-oxide-semiconductor M3 reduces, grid
Pole tension, which reduces then ducting capacity, to be enhanced, so that C piezoelectric voltage increases, it is by operational amplifier OP1 since C point voltage becomes larger
Function and effect, so C point voltage change is greater than the variation of A point voltage, based on C point voltage change, operational amplifier OP2's is defeated
The voltage of outlet D reduces, and D point voltage reduces the ducting capacity enhancing of then metal-oxide-semiconductor M1, then A point voltage increases, and forms positive feedback.
When B point voltage increases, the output end voltage of OP1 is increased, and C point voltage reduces, and the reduction of C point voltage is then put by operation
The output end D point voltage of big device OP2 increases, then the ducting capacity of M2 reduces, and B point voltage also reduces, and is negative-feedback.
A point is fed back to positive and negative feed point, and B point is fed back to negative-feedback point, in order to make entire circuit negative-feedback, uses
The big resistive arrangement that the emitter of Q2 and R2 composition follows structure to generate, so as to guarantee that negative-feedback is greater than positive feedback, it is ensured that
The stability of circuit.
Wherein, transistor M1, M2, M3 is PMOS transistor；Triode Q1, Q2 are NPN triode；Triode Q1, Q2's
Emitter area ratio is 1:N, and N is integer, preferably 8.
Feedback loop is wherein formed by operational amplifier OP1, detects A, B two o'clock voltage, and is the base stage of triode Q1, Q2
Voltage is provided.C3, R3 constitute compensation circuit, provide compensation for feedback control loop, and eliminate M3 and C3 generation zero point, thus make be
It unites more stable.Operational amplifier OP2, transistor M1, M2 detect A, C two o'clock voltage change, output connection transistor M1, M2
Grid, so that the electric current for flowing through triode Q1, Q2 is equal.Capacitor C1, C2 compensate the phase of feedback control loop.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (8)
1. a kind of band-gap reference circuit characterized by comprising positive feedback loop, negative feedback loop and emitter follow circuit；
The positive feedback loop includes transistor M1, operational amplifier OP1, transistor M3 and operational amplifier OP2；It is described negative anti-
Being fed back to road includes transistor M2, operational amplifier OP1, transistor M3 and operational amplifier OP2；
The source electrode of the transistor M1, the transistor M2 and the transistor M3 are connected with supply voltage VDD, the crystal
The drain electrode of pipe M1 is connected with the inverting input terminal of the operational amplifier OP1, and drain electrode and the operation of the transistor M2 is put
The normal phase input end of big device OP1 is connected, and the output end of the operational amplifier OP1 is connected with the grid of the transistor M3, institute
The drain electrode for stating transistor M3 is connected with the inverting input terminal of the operational amplifier OP2, and the positive of the operational amplifier OP2 is defeated
Enter end to be connected with the transistor M1, the output end of the operational amplifier OP2 connects the grid of the transistor M1 and described
The grid of transistor M2；
The grid of the transistor M1 connects the grid of the transistor M2；
It includes triode Q2 and resistance R2 that the emitter, which follows circuit, and the emitter of the triode Q2 is with the resistance R2's
One end is connected, and the collector of the triode Q2 is connect with the normal phase input end of the operational amplifier OP1, the triode
Base stage is connect with the inverting input terminal of the operational amplifier OP2, the other end ground connection of the resistance R2.
2. a kind of band-gap reference circuit according to claim 1, which is characterized in that it further include compensation circuit, the compensation
The first compensation circuit of circuit and the second compensation circuit；
First compensation circuit includes capacitor C1 and capacitor C2, and second compensation circuit includes capacitor C3 and resistance R3；
One end of the capacitor C1 is connected with the drain electrode of the transistor M1, the output of the other end and the operational amplifier OP2
End is connected with one end of the capacitor C2, the other end of the capacitor C2 and the transistor M2 and operational amplifier OP1
Positive input be connected；
One end of the capacitor C3 is connected with the grid of the output end of the operational amplifier OP1 and the transistor M3, another
End is connected with the resistance R3, and the other end of the resistance R3 connects the base stage of the triode Q2.
3. a kind of band-gap reference circuit according to claim 2, which is characterized in that it further include triode Q1, three pole
The base stage of pipe Q1 is connected with the base stage of the triode Q2, the drain electrode phase of the collector of the triode Q1 and the transistor M1
Even, the emitter ground connection of the triode Q1.
4. a kind of band-gap reference circuit according to claim 3, which is characterized in that triode Q1 and resistance Q2 pass through electricity
Hinder R1 ground connection.
5. a kind of band-gap reference circuit according to claim 1, which is characterized in that accessed in the drain electrode of the transistor M3
Reference voltage Vref。
6. a kind of band-gap reference circuit described in any one of -5 according to claim 1, which is characterized in that the transistor
M1, the transistor M2 and the transistor M3 are N-type MOS transistor.
7. a kind of band-gap reference circuit described in any one of -5 according to claim 1, which is characterized in that the triode Q1
It is NPN triode with the triode Q2；The emitter area ratio of the triode Q1 and triode Q2 is 1:N, and N is whole
Number.
8. a kind of band-gap reference circuit according to claim 7, which is characterized in that N 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920034512.8U CN208969535U (en) | 2019-01-09 | 2019-01-09 | A kind of band-gap reference circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920034512.8U CN208969535U (en) | 2019-01-09 | 2019-01-09 | A kind of band-gap reference circuit |
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| CN208969535U true CN208969535U (en) | 2019-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716605A (en) * | 2019-10-14 | 2020-01-21 | 西安理工大学 | Quick start PTAT current source based on operational amplifier positive feedback mechanism |
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2019
- 2019-01-09 CN CN201920034512.8U patent/CN208969535U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716605A (en) * | 2019-10-14 | 2020-01-21 | 西安理工大学 | Quick start PTAT current source based on operational amplifier positive feedback mechanism |
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