CN105630063A - Reference power supply generating circuit - Google Patents
Reference power supply generating circuit Download PDFInfo
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- CN105630063A CN105630063A CN201410581113.5A CN201410581113A CN105630063A CN 105630063 A CN105630063 A CN 105630063A CN 201410581113 A CN201410581113 A CN 201410581113A CN 105630063 A CN105630063 A CN 105630063A
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Abstract
The invention discloses a reference power supply generating circuit, which comprises a self-biasing circuit (1), a first stage preliminary adjustment circuit (2), a second stage preliminary adjustment circuit, a band gap reference core circuit (4), and a signal reactive circuit (5) that are connected in order. The self-biasing circuit has a self-biasing current mirror structure so that the circuit can be self-started without extra starting circuits; the output of the second stage preliminary adjustment circuit is used as a reference voltage output directly and provides a power supply for the band gap reference core circuit at the same time, in this way, bandload capability of the reference voltage can be raised; none-operation amplifier feedback loop adjusting is adopted, and compared with traditional reference voltage source circuit, an operation amplifier for clamping is reduced, therefore, area is saved and static power consumption is reduced; compared with a traditional band gap reference voltage source circuit, the power supply inhibition ratio of the output reference voltage is greatly improved, particularly the characteristics in high frequency.
Description
Technical field
The present invention relates to a kind of reference voltage source, specifically refer to the generation circuit of a kind of reference power supply.
Background technology
No matter being at digital circuit, analog circuit or be in Digital Analog Hybrid Circuits, high performance reference voltage source is all indispensable, and the performance of whole system is played conclusive effect by it. Reference voltage determines the important system indexs such as the current value that flows through in the trigging signal of comparator, the frequency of oscillation of agitator, power tube under normal circumstances. Being based on case above, the requirement for reference voltage source circuit improves constantly, and occurs in that a lot of circuit structure. As it is shown in figure 1, be the method for designing of a kind of traditional reference voltage source. This circuit includes the operational amplifier with positive-negative input end and output port, resistance R1, R2, R3 and two transistors Q1, Q2. Wherein resistance R1=R2=R, the emitter area of transistor Q1 is N times of the emitter area of Q2. In the practical work process of circuit, owing to the open-loop gain of operational amplifier is very big, so the differential mode voltage of two inputs is only small, it is believed that approximately equal, thus there is V (+)=V (-), V (+), V (-) respectively the normal phase input end voltage of operational amplifier and anti-phase input terminal voltage, it may be assumed that
VBE1+IC1*R3=VBE2
V in formulaBE1,VBE2The respectively base emitter voltage of Q1, Q2, IC1For the collector current of Q1, due to collector current
,
Wherein ISFor PN junction reverse saturation current, VT=KT/q is thermal voltage, and bringing above formula into can obtain:
Wherein, N is the ratio of the emitter area of Q1 and Q2,
So, just creating the road electric current with PTAT, this electric current creates the voltage presenting positive temperature characterisitic at resistance R2, is then added with the VBE2 with negative temperature characteristic, it is possible to obtain one and vary with temperature only small reference voltage source VREF,
In the reference voltage source generating circuit that this is traditional, the PSRR PSRR of output reference voltage depends on the characteristic of operational amplifier itself. The PSRR of common two-level operating amplifier characteristic in high frequency is very poor, and in order to improve the performance under high frequency, the structure of operational amplifier is just more complicated, adds area and the power consumption of circuit; Meanwhile, there is degeneracy point in traditional reference voltage source generating circuit, it is necessary to extra start-up circuit makes circuit depart from " zero " degeneracy state, which again increases the cost of circuit.
Summary of the invention
It is an object of the invention to overcome in current elevator running, its running orbit is unstable, it is easy to deviate a difficult problem for original design track, it is provided that the positioner of a kind of elevator running orbit.
The purpose of the present invention is achieved through the following technical solutions:
The generation circuit of a kind of reference power supply of the present invention, including the auto bias circuit being sequentially connected with, first order pre-adjusting circuit, second level pre-adjusting circuit, described second level pre-adjusting circuit is connected with band gap reference core circuit and signal feedback circuit respectively, and described band gap reference core circuit is connected with signal feedback circuit.
Described auto bias circuit includes metal-oxide-semiconductor MP1, resistance R1, audion Q1, audion Q2, wherein the source electrode of metal-oxide-semiconductor MP1 is connected with external power source VIN, the drain and gate of MP1 is connected with colelctor electrode and the base stage of audion Q1 by resistance R1 after connecting simultaneously, the emitter stage of audion Q1 is connected with colelctor electrode and the base stage of audion Q2 simultaneously, the grounded emitter of Q2, the grid of MP1 is connected with first order pre-adjusting circuit as the output of auto bias circuit, and the colelctor electrode of audion Q1 is connected with second level pre-adjusting circuit after being connected with resistance R1.
Described first order pre-adjusting circuit includes metal-oxide-semiconductor MP2, MN1, diode ZD1, electric capacity C1, the source electrode of described MP2 is connected with external power source VIN, the grid of MP2 is connected with auto bias circuit, the drain electrode of MP2 is connected with the negative electrode of the grid of MN1, diode ZD1 respectively, the drain electrode of MN1 is connected with external power source VIN, the source electrode of MN1 is connected with second level pre-adjusting circuit as the outfan VDD1 of first order pre-adjusting circuit, the plus earth of diode ZD1, and it is parallel with electric capacity C1 at the two ends of diode ZD1.
Described diode ZD1 is Zener diode.
Described second level pre-adjusting circuit includes three metal-oxide-semiconductor MP3, MP4, MP5, two audion Q3, Q4, one resistance R2, the source electrode of described MP3 is connected with the outfan VDD1 of first order pre-adjusting circuit, the grid of MP3 is connected with auto bias circuit, the drain electrode of MP3 respectively with the colelctor electrode of Q4, one end of resistance R2 connects, the other end of resistance R2 respectively with the colelctor electrode of audion Q3, the base stage of Q3, the base stage of Q4 connects, the base stage of Q3 is connected with the base stage of Q4, the emitter stage of Q3 is connected with the source electrode of MP4, the emitter stage of Q4 is connected with the source electrode of MP5, and as second level pre-adjusting circuit outfan VREF respectively with band gap reference core circuit, signal feedback circuit connects, the grid of MP4 is connected with signal feedback circuit after being connected with the grid of MP5, the drain electrode of MP4 and the drain electrode of MP5 ground connection simultaneously.
Described band gap reference core circuit includes three resistance R3, R4, R5, two audions Q6, Q7, one end of described resistance R3 and R4 is connected with the outfan VREF of second level pre-adjusting circuit after connecting, the other end of R3 is connected with the colelctor electrode of signal feedback circuit, audion Q6 respectively, the base stage of Q6 is connected with signal feedback circuit after being connected with the base stage of Q7, the emitter stage of Q6 passes through resistance R5 ground connection, the other end of resistance R4 receives colelctor electrode and the base stage of audion Q7, the grounded emitter of Q7.
Described signal feedback circuit includes two metal-oxide-semiconductor MP6, MP7, two audion Q5, Q8, one electric capacity C2, wherein, the source electrode of MP6 and the source electrode of MP7 are connected with the outfan VREF of second level pre-adjusting circuit respectively, the grid of MP6, the grid of MP7 and the drain electrode of MP7 connect, the drain electrode of MP6 is connected with the colelctor electrode of audion Q5, the base stage of Q5 is connected with band gap reference core circuit, and be connected with the outfan VREF of second level pre-adjusting circuit by electric capacity C2, the grounded emitter of Q5, the grid of MP7 and the drain electrode of MP7 are connected with the colelctor electrode of audion Q8 after connecting, the base stage of Q8 is connected with band gap reference core circuit, the grounded emitter of Q8.
The operation principle of circuit of the present invention is as follows:
Assume resistance R3=R4=R, then after normal circuit operation, if the electric current flow through on resistance R3, R4 is unequal, then by the mirror image relationship of Q6, Q7, the difference of two branch currents is converted into the change of Q5 base voltage, Q5 is considered as the amplifier of a single-stage, and MP6 is its active load. This is sent to the error voltage of Q5 base stage and arrives the outfan VREF of reference voltage after the amplification of Q5 through one-level source follower MP5, thus feedback control loop can regulate reference output voltage, as long as loop gain is sufficiently large, then can ensure that the electric current flow through on resistance R3, R4 is equal, it may be assumed that
I*R3=I*R4=I*R
Can obtain:
VBE6+I*R5=VBE7
The base-emitter voltage of VBE6, VBE7 respectively Q6, Q7 in formula. The same with the derivation in traditional bandgap reference voltage source obtain:
Wherein, N is the ratio of the emitter area of Q6 and Q7, and VT is thermal voltage, is about 26mV under room temperature. The expression formula of such reference output voltage is:
It will be seen that feedback loop not only ensure that the electric current flowing through resistance R3, R4 is equal, and contribute to reducing the output reference voltage VREF change with pre-adjustment voltage VDD2. When pre-adjustment voltage VDD2 occurs fluctuation to make output reference voltage VREF increase, feedback loop makes the base voltage of Q3 reduce by MP4, owing to the base stage of Q4 and the base stage of Q3 connect together, it is possible to suppress output reference voltage with the change of pre-adjustment voltage VDD2.
Simultaneously as have employed the pre-adjusting circuit of two-stage, the PSRR of output reference voltage is further enhanced, and the expression formula of the PSRR providing output reference voltage is as follows:
PSRRVREF/VIN?dB=PSRRVREF/VDD1,2?dB+PSRRVDD1,2/VIN?dB
PSRRVREF/VIN?dBFor the benchmark VREF PSRR relative to supply voltage VIN, PSRRVREF/VDD1,2?dBFor the benchmark VREF PSRR relative to pre-adjustment voltage VDD1, VDD2, PSRRVDD1,2/VIN?dBFor PSRR relative to supply voltage VIN of pre-adjustment voltage VDD1, VDD2.
It can thus be seen that output reference voltage PSRR improves a lot than traditional band gap reference voltage source circuit really in circuit of the present invention, particularly characteristic in high frequency.
The present invention compared with prior art, has such advantages as and beneficial effect:
The generation circuit of 1 a kind of reference power supply of the present invention, have employed the auto bias circuit of self-biasing current mirror structure, so, circuit just can self-starting, and be no longer necessary to extra start-up circuit;
The generation circuit of 2 a kind of reference power supplies of the present invention, and powers the output of second level pre-adjusting circuit to band gap reference core circuit directly as reference voltage output simultaneously, and such connected mode can improve the load capacity of reference voltage;
The generation circuit of 3 a kind of reference power supplies of the present invention, have employed and regulate without amplifier feedback control loop, compared with traditional reference voltage source circuit, decrease an amplifier carrying out clamper, save area, reduce quiescent dissipation;
The generation circuit of 4 a kind of reference power supplies of the present invention, the PSRR of output reference voltage improves a lot than traditional band gap reference voltage source circuit, particularly characteristic in high frequency.
Accompanying drawing explanation
Fig. 1 is traditional band gap reference voltage source circuit figure;
Fig. 2 is circuit diagram of the present invention.
Labelling and corresponding parts title in accompanying drawing:
1-auto bias circuit, 2-first order pre-adjusting circuit, 3-second level pre-adjusting circuit, 4-band gap reference core circuit, 5-signal feedback circuit.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As in figure 2 it is shown, one wide input voltage high PSRR PSRR reference voltage source of the present invention, including the auto bias circuit 1 being sequentially connected with, first order pre-adjusting circuit 2, second level pre-adjusting circuit 3, signal feedback circuit 5, band gap reference core circuit 4. auto bias circuit 1 includes metal-oxide-semiconductor MP1, resistance R1, audion Q1, audion Q2, the source electrode of metal-oxide-semiconductor MP1 is connected with external power source VIN, the drain and gate of MP1 is connected by colelctor electrode and the base stage of resistance R1 and audion Q1 after connecting, the emitter stage of Q1 is connected with colelctor electrode and the base stage of audion Q2 simultaneously, the grounded emitter of Q2, the grid of MP1 is connected with the MP2 grid in first order pre-adjusting circuit 2, and the colelctor electrode of audion Q1 is connected with the grid of the MP3 in second level pre-adjusting circuit 3 after being connected with resistance R1, first order pre-adjusting circuit 2 includes metal-oxide-semiconductor MP2, MN1, Zener diode ZD1, electric capacity C1, the source electrode of MP2 is connected with external power source VIN, the drain electrode of MP2 is connected with the negative electrode of the grid of MN1, Zener diode ZD1 respectively, the drain electrode of MN1 is connected with external power source VIN, the source electrode of MN1 is as the outfan VDD1 of first order pre-adjusting circuit 2 and is connected with the resistance R2 in second level pre-adjusting circuit 3, the plus earth of Zener diode ZD1, and it is parallel with electric capacity C1 at the two ends of Zener diode ZD1, second level pre-adjusting circuit 3 includes three metal-oxide-semiconductor MP3, MP4, MP5, two audion Q3, Q4, one resistance R2, the drain electrode of MP3 respectively with the colelctor electrode of Q4, one end of resistance R2 connects, the other end of resistance R2 respectively with the colelctor electrode of audion Q3, the base stage of Q3, the base stage of Q4 connects, the base stage of Q3 is connected with the base stage of Q4, the emitter stage of Q3 is connected with the source electrode of MP4, the emitter stage of Q4 as second level pre-adjusting circuit 3 outfan VREF respectively with the resistance R3 in band gap reference core circuit 4, resistance R4, MP6 source electrode in signal feedback circuit 5, MP7 source electrode, electric capacity C2, the source electrode of MP5 connects, the grid of MP4 be connected with the grid of MP5 after with the drain electrode of MP6, the colelctor electrode of Q6 connects, the drain electrode of MP4 and the drain electrode of MP5 ground connection simultaneously, band gap reference core circuit 4 includes three resistance R3, R4, R5, two audions Q6, Q7, one end of described resistance R3 and R4 is connected with the outfan VREF of second level pre-adjusting circuit after connecting, the other end of R3 respectively with electric capacity C2, the base stage of audion Q5, audion Q6 colelctor electrode be connected, the emitter stage of Q6 passes through resistance R5 ground connection, the other end of resistance R4 respectively with the base stage of Q6, the base stage of Q7, the colelctor electrode of Q7, Q8 base stage be connected, the grounded emitter of Q7, the grid of MP6, the grid of MP7 and the drain electrode of MP7 connect, the drain electrode of MP6 is connected with the colelctor electrode of audion Q5, the base stage of Q5 is connected with band gap reference core circuit, and be connected with the outfan VREF of second level pre-adjusting circuit by electric capacity C2, the grounded emitter of Q5, the grid of MP7 and the drain electrode of MP7 are connected with the colelctor electrode of audion Q8 after connecting, and the base stage of Q8 is connected with band gap reference core circuit, the grounded emitter of Q8.
Work process:
After power supply electrifying, auto bias circuit begins to work, MP1 produces electric current I1 mirror image manage to MP2, bias current required during for Zener diode offer normal operation, electric capacity C1 is charged simultaneously, when the pressure drop on electric capacity is higher than the threshold value of MN1 pipe, MN1 pipe turns on, source electrode at MN1 pipe obtains pre-adjustment voltage VDD1, Simultaneous Switching pipe MP3 opens, the voltage of VDD1 is passed to VDD2 and in whole circuit, produces electric current simultaneously so that the core circuit of band gap reference departs from " zero " state.
As the analysis to traditional bandgap reference voltage source, after whole normal circuit operation, the emitter junction difference in voltage of Q6, Q7 produces to be proportional to the electric current of absolute temperature on resistance R5, this electric current creates the voltage with positive temperature coefficient on resistance R4, adds that the emitter junction voltage of the Q7 with negative temperature coefficient just creates the bandgap voltage reference VREF almost with zero-temperature coefficient. The negative feedback loop being made up of Q3, Q4, Q5, Q8, MP4, MP5, MP6, MP7, R2, C2 has higher loop gain, can ensure that the electric current flow through on resistance R3, R4 is equal, and contribute to reducing the output reference voltage VREF change with pre-adjustment voltage VDD2. When pre-adjustment voltage VDD2 occurs fluctuation to make output reference voltage VREF increase, feedback loop makes the base voltage of Q3 reduce by MP4, owing to the base stage of Q4 and the base stage of Q3 connect together, so output reference voltage can be suppressed with the change of pre-adjustment voltage VDD2, improve PSRR.
As it has been described above, the present invention just can be realized well.
Claims (7)
1. the generation circuit of a reference power supply, it is characterized in that: the auto bias circuit (1) that includes being sequentially connected with, first order pre-adjusting circuit (2), second level pre-adjusting circuit (3), described second level pre-adjusting circuit (3) is connected with band gap reference core circuit (4) and signal feedback circuit (5) respectively, and described band gap reference core circuit (4) is connected with signal feedback circuit (5).
2. the generation circuit of a kind of reference power supply according to claim 1, it is characterized in that: described auto bias circuit (1) includes metal-oxide-semiconductor MP1, resistance R1, audion Q1, audion Q2, wherein the source electrode of metal-oxide-semiconductor MP1 is connected with external power source VIN, the drain and gate of MP1 is connected with colelctor electrode and the base stage of audion Q1 by resistance R1 after connecting simultaneously, the emitter stage of audion Q1 is connected with colelctor electrode and the base stage of audion Q2 simultaneously, the grounded emitter of Q2, the grid of MP1 is connected with first order pre-adjusting circuit (2) as the output of auto bias circuit (1), the colelctor electrode of audion Q1 is connected with second level pre-adjusting circuit (3) after being connected with resistance R1.
3. the generation circuit of a kind of reference power supply according to claim 1, it is characterized in that: described first order pre-adjusting circuit (2) includes metal-oxide-semiconductor MP2, MN1, diode ZD1, electric capacity C1, the source electrode of described MP2 is connected with external power source VIN, the grid of MP2 is connected with auto bias circuit (1), the drain electrode of MP2 respectively with the grid of MN1, the negative electrode of diode ZD1 connects, the drain electrode of MN1 is connected with external power source VIN, the source electrode of MN1 is connected with second level pre-adjusting circuit (3) as the outfan VDD1 of first order pre-adjusting circuit (2), the plus earth of diode ZD1, and it is parallel with electric capacity C1 at the two ends of diode ZD1.
4. the generation circuit of a kind of reference power supply according to claim 3, it is characterised in that: described diode ZD1 is Zener diode.
5. the generation circuit of a kind of reference power supply according to claim 1, it is characterized in that: described second level pre-adjusting circuit (3) includes three metal-oxide-semiconductor MP3, MP4, MP5, two audion Q3, Q4, one resistance R2, the source electrode of described MP3 is connected with the outfan VDD1 of first order pre-adjusting circuit (2), the grid of MP3 is connected with auto bias circuit (1), the drain electrode of MP3 respectively with the colelctor electrode of Q4, one end of resistance R2 connects, the other end of resistance R2 respectively with the colelctor electrode of audion Q3, the base stage of Q3, the base stage of Q4 connects, the base stage of Q3 is connected with the base stage of Q4, the emitter stage of Q3 is connected with the source electrode of MP4, the emitter stage of Q4 is connected with the source electrode of MP5, and as second level pre-adjusting circuit (3) outfan VREF respectively with band gap reference core circuit (4), signal feedback circuit (5) connects, the grid of MP4 is connected with signal feedback circuit (5) after being connected with the grid of MP5, the drain electrode of MP4 and the drain electrode of MP5 ground connection simultaneously.
6. the generation circuit of a kind of reference power supply according to claim 1, it is characterized in that: described band gap reference core circuit (4) includes three resistance R3, R4, R5, two audion Q6, Q7, one end of described resistance R3 and R4 is connected with the outfan VREF of second level pre-adjusting circuit (3) after connecting, the other end of R3 respectively with signal feedback circuit (5), the colelctor electrode of audion Q6 connects, the base stage of Q6 is connected with signal feedback circuit (5) after being connected with the base stage of Q7, the emitter stage of Q6 passes through resistance R5 ground connection, the other end of resistance R4 receives colelctor electrode and the base stage of audion Q7, the grounded emitter of Q7.
7. the generation circuit of a kind of reference power supply according to claim 1, it is characterized in that: described signal feedback circuit (5) includes two metal-oxide-semiconductor MP6, MP7, two audion Q5, Q8, one electric capacity C2, wherein, the source electrode of MP6 and the source electrode of MP7 are connected with the outfan VREF of second level pre-adjusting circuit (3) respectively, the grid of MP6, the grid of MP7 and the drain electrode of MP7 connect, the drain electrode of MP6 is connected with the colelctor electrode of audion Q5, the base stage of Q5 is connected with band gap reference core circuit (4), and be connected with the outfan VREF of second level pre-adjusting circuit (3) by electric capacity C2, the grounded emitter of Q5, the grid of MP7 and the drain electrode of MP7 are connected with the colelctor electrode of audion Q8 after connecting, the base stage of Q8 is connected with band gap reference core circuit (4), the grounded emitter of Q8.
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| CN201410581113.5A CN105630063A (en) | 2014-10-27 | 2014-10-27 | Reference power supply generating circuit |
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| CN201410581113.5A CN105630063A (en) | 2014-10-27 | 2014-10-27 | Reference power supply generating circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614611A (en) * | 2018-06-27 | 2018-10-02 | 上海治精微电子有限公司 | Low-noise band-gap reference voltage source, electronic equipment |
| CN108681358A (en) * | 2018-05-17 | 2018-10-19 | 上海华虹宏力半导体制造有限公司 | Internal electric source generation circuit in reference current generating circuit |
| CN114356018A (en) * | 2021-12-31 | 2022-04-15 | 京微齐力(北京)科技有限公司 | Band-gap reference source circuit capable of switching conventional mode and low-voltage mode |
| CN115268545A (en) * | 2022-07-26 | 2022-11-01 | 骏盈半导体(上海)有限公司 | Band-gap reference circuit with low-voltage regulation function and method |
-
2014
- 2014-10-27 CN CN201410581113.5A patent/CN105630063A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108681358A (en) * | 2018-05-17 | 2018-10-19 | 上海华虹宏力半导体制造有限公司 | Internal electric source generation circuit in reference current generating circuit |
| CN108614611A (en) * | 2018-06-27 | 2018-10-02 | 上海治精微电子有限公司 | Low-noise band-gap reference voltage source, electronic equipment |
| CN114356018A (en) * | 2021-12-31 | 2022-04-15 | 京微齐力(北京)科技有限公司 | Band-gap reference source circuit capable of switching conventional mode and low-voltage mode |
| CN115268545A (en) * | 2022-07-26 | 2022-11-01 | 骏盈半导体(上海)有限公司 | Band-gap reference circuit with low-voltage regulation function and method |
| CN115268545B (en) * | 2022-07-26 | 2023-12-05 | 骏盈半导体(上海)有限公司 | Band gap reference circuit with low-voltage regulation function and method |
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Application publication date: 20160601 |