CN104808737A - Negative voltage reference circuit - Google Patents
Negative voltage reference circuit Download PDFInfo
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- CN104808737A CN104808737A CN201510201093.9A CN201510201093A CN104808737A CN 104808737 A CN104808737 A CN 104808737A CN 201510201093 A CN201510201093 A CN 201510201093A CN 104808737 A CN104808737 A CN 104808737A
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Abstract
The invention provides a negative voltage reference circuit, which comprises operational amplifiers U1 and U2, resistors R1, R2, R3 and R4, a PMOS pipe M1 and a NMOS pipe M2; the in-phase input end of the U1 is connected with positive reference voltage + Vref, the output end of the U1 is connected with the grid electrode of the PMOS pipe M1, the source electrode of the PMOS pipe M1 is connected with positive supply voltage VCC, and the drain electrode of the PMOS pipe M1 is connected with one end of the resistor R1; the anti-phase input end of the U1 is connected with the other end of the resistor R1 and one end of the resistor R2; the other end of the resistor R2 is connected with one end of the resistor R3 and the anti-phase input end of the U2; the in-phase input end of the U2 is grounded; the other end of the resistor R3 is connected with one end of the resistor R4, and the other end of the resistor R4 is connected with the drain electrode of the NMOS pipe M2; the grid electrode of the NMOS pipe M2 is connected with the output end of the U2, and the source electrode of the NMOS pipe M2 is connected with negative supply voltage Vee; negative reference voltage -Vref is obtained from the end, connected with the resistor R4, of the resistor R3. According to the negative voltage reference circuit, the conversion, from a positive voltage domain to a negative voltage domain, of voltage reference is realized. Only one set of band-gap reference voltage needs to be designed in the circuit.
Description
Technical field
The present invention relates to a kind of voltage reference circuit, particularly relate to a kind of negative voltage reference circuit.
Background technology
Voltage reference circuit is a very important module in Analogous Integrated Electronic Circuits, and this module provides voltage accurately for other modules in circuit.Along with the development of circuit engineering, the complexity day by day of system, increasing of voltage domain, in a Circuits System, needs to use multiple different voltage reference.In same voltage domain, often bandgap voltage reference is passed through resistor network or multiplication of voltage mode, realize multiple various different reference voltage, but when needing positive voltage reference and negative voltage reference in circuit, adopt this kind of method to realize, two cover band-gap references must be designed, just can meet the demands.That is, only design a set of band-gap reference in available circuit, voltage reference cannot be realized by the conversion of positive voltage territory to negative voltage territory.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of negative voltage reference circuit, this negative voltage reference circuit adopts two differential operational amplifiers, and resistor network, achieves voltage reference by the conversion of positive voltage territory to negative voltage territory.Only need in circuit to design a set of bandgap voltage reference, both can realize the reference voltage in full voltage territory.The technical solution used in the present invention is:
A kind of negative voltage reference circuit, comprise: the resistance of two series connection, the node that the resistance of these two series connection connects establishes a zero potential, establish a positive reference voltage at the other end of first non-series connection connected node of resistance, obtain negative reference voltage from the other end of the non-series connection connected node of second resistor.
Above-mentioned negative voltage reference circuit, specifically comprises operational amplifier U1 and U2, resistance R1, R2, R3 and R4, PMOS M1 and NMOS tube M2;
Resistance R2 is first resistance in the resistance of above-mentioned two series connection, and resistance R3 is the second resistor in the resistance of above-mentioned two series connection;
The in-phase input end of operational amplifier U1 meets positive reference voltage+Vref, and export the grid of termination PMOS M1, the source electrode of PMOS M1 meets positive voltage VCC, one end of drain electrode connecting resistance R1; The other end of anti-phase input terminating resistor R1 of operational amplifier U1 and one end of resistance R2; One end of other end connecting resistance R3 of resistance R2 and the inverting input of operational amplifier U2; The in-phase input end ground connection of operational amplifier U2; One end of the other end connecting resistance R4 of resistance R3, the drain electrode of another termination NMOS tube M2 of resistance R4; The grid of NMOS tube M2 connects the output terminal of operational amplifier U2, and source electrode meets negative supply voltage Vee;
That one end connected from resistance R3 and R4 obtains negative reference voltage-Vref.
Further, described resistance R2 is variable resistor.
The invention has the advantages that:
1) reference voltage can be realized by the conversion of positive voltage territory to negative voltage territory.
2) by regulating R2 resistance, multiple different negative reference voltage can be realized.
3) only need in circuit to design a set of bandgap voltage reference, both can realize the reference voltage in full voltage territory.
Accompanying drawing explanation
Fig. 1 is structure of the present invention composition schematic diagram.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
The negative voltage reference circuit that the present invention proposes, as shown in Figure 1, comprises operational amplifier U1 and U2, resistance R1, R2, R3 and R4, PMOS M1 and NMOS tube M2;
The in-phase input end of operational amplifier U1 meets positive reference voltage+Vref, and export the grid of termination PMOS M1, the source electrode of PMOS M1 meets positive voltage VCC, one end of drain electrode connecting resistance R1; The other end of anti-phase input terminating resistor R1 of operational amplifier U1 and one end of resistance R2; One end of other end connecting resistance R3 of resistance R2 and the inverting input of operational amplifier U2; The in-phase input end ground connection of operational amplifier U2; One end of the other end connecting resistance R4 of resistance R3, the drain electrode of another termination NMOS tube M2 of resistance R4; The grid of NMOS tube M2 connects the output terminal of operational amplifier U2, and source electrode meets negative supply voltage Vee;
That one end connected from resistance R3 and R4 obtains negative reference voltage-Vref.
Above-mentioned positive reference voltage+Vref is positive bandgap voltage reference.
Operational amplifier U1 and U2 is differential operational amplifier.
According to the circuit logic of Fig. 1, consider " empty short " between U1 and U2 two input ends separately, A node voltage is positive reference voltage+Vref, B node voltage is GND, identical owing to flowing through the ohmically electric current of R2, R3 ,-Vref=R3/R2* (+Vref) can be obtained, realize the conversion of positive voltage reference to negative voltage reference, the resistance of adjustment R2, both can realize multiple different negative reference voltage.
Claims (3)
1. a negative voltage reference circuit, it is characterized in that, comprise: the resistance of two series connection, the node that the resistance of these two series connection connects establishes a zero potential, establish a positive reference voltage at the other end of first non-series connection connected node of resistance, obtain negative reference voltage from the other end of the non-series connection connected node of second resistor.
2. negative voltage reference circuit as claimed in claim 1, is characterized in that, comprise operational amplifier U1 and U2, resistance R1, R2, R3 and R4, PMOS M1 and NMOS tube M2;
Resistance R2 is first resistance in the resistance of above-mentioned two series connection, and resistance R3 is the second resistor in the resistance of above-mentioned two series connection;
The in-phase input end of operational amplifier U1 meets positive reference voltage+Vref, and export the grid of termination PMOS M1, the source electrode of PMOS M1 meets positive voltage VCC, one end of drain electrode connecting resistance R1; The other end of anti-phase input terminating resistor R1 of operational amplifier U1 and one end of resistance R2; One end of other end connecting resistance R3 of resistance R2 and the inverting input of operational amplifier U2; The in-phase input end ground connection of operational amplifier U2; One end of the other end connecting resistance R4 of resistance R3, the drain electrode of another termination NMOS tube M2 of resistance R4; The grid of NMOS tube M2 connects the output terminal of operational amplifier U2, and source electrode meets negative supply voltage Vee;
That one end connected from resistance R3 and R4 obtains negative reference voltage-Vref.
3. negative voltage reference circuit as claimed in claim 2, is characterized in that:
Described resistance R2 is variable resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510201093.9A CN104808737A (en) | 2015-04-24 | 2015-04-24 | Negative voltage reference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510201093.9A CN104808737A (en) | 2015-04-24 | 2015-04-24 | Negative voltage reference circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104808737A true CN104808737A (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510201093.9A Pending CN104808737A (en) | 2015-04-24 | 2015-04-24 | Negative voltage reference circuit |
Country Status (1)
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| CN (1) | CN104808737A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571735A (en) * | 2016-10-19 | 2017-04-19 | 芜湖鑫芯微电子有限公司 | Negative voltage comparator |
| CN112181042A (en) * | 2020-11-16 | 2021-01-05 | 江苏万邦微电子有限公司 | Negative voltage reference circuit suitable for wide voltage range |
| CN112306142A (en) * | 2020-11-16 | 2021-02-02 | 江苏万邦微电子有限公司 | Negative voltage reference circuit |
| CN115133934A (en) * | 2022-06-14 | 2022-09-30 | 中船航海科技有限责任公司 | High-precision low-power current frequency conversion circuit and conversion method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005312169A (en) * | 2004-04-21 | 2005-11-04 | Rohm Co Ltd | Voltage-inverting charge pump circuit |
| US20130221942A1 (en) * | 2012-02-24 | 2013-08-29 | Novatek Microelectronics Corp. | Multi-power domain operational amplifier and voltage generator using the same |
| CN103592985A (en) * | 2013-11-11 | 2014-02-19 | 无锡普雅半导体有限公司 | Negative voltage regulation circuit |
| CN103729005A (en) * | 2012-10-12 | 2014-04-16 | 郑州单点科技软件有限公司 | Negative voltage regulating circuit |
-
2015
- 2015-04-24 CN CN201510201093.9A patent/CN104808737A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005312169A (en) * | 2004-04-21 | 2005-11-04 | Rohm Co Ltd | Voltage-inverting charge pump circuit |
| US20130221942A1 (en) * | 2012-02-24 | 2013-08-29 | Novatek Microelectronics Corp. | Multi-power domain operational amplifier and voltage generator using the same |
| CN103729005A (en) * | 2012-10-12 | 2014-04-16 | 郑州单点科技软件有限公司 | Negative voltage regulating circuit |
| CN103592985A (en) * | 2013-11-11 | 2014-02-19 | 无锡普雅半导体有限公司 | Negative voltage regulation circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571735A (en) * | 2016-10-19 | 2017-04-19 | 芜湖鑫芯微电子有限公司 | Negative voltage comparator |
| CN112181042A (en) * | 2020-11-16 | 2021-01-05 | 江苏万邦微电子有限公司 | Negative voltage reference circuit suitable for wide voltage range |
| CN112306142A (en) * | 2020-11-16 | 2021-02-02 | 江苏万邦微电子有限公司 | Negative voltage reference circuit |
| CN115133934A (en) * | 2022-06-14 | 2022-09-30 | 中船航海科技有限责任公司 | High-precision low-power current frequency conversion circuit and conversion method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150729 |
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| RJ01 | Rejection of invention patent application after publication |