CN105024658B - A kind of protection circuit of differential pair tube - Google Patents
A kind of protection circuit of differential pair tube Download PDFInfo
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- CN105024658B CN105024658B CN201510314651.2A CN201510314651A CN105024658B CN 105024658 B CN105024658 B CN 105024658B CN 201510314651 A CN201510314651 A CN 201510314651A CN 105024658 B CN105024658 B CN 105024658B
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- pmos
- grid
- protection circuit
- differential pair
- tube
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Abstract
Present invention is disclosed a kind of protection circuit of differential pair tube, differential pair tube is respectively PMOS/NMOS differential pair tubes, and paired NMOS tube is set up in the protection circuit of PMOS differential pair pipe, and paired PMOS is set up in nmos differential is to the protection circuit of pipe.Beneficial effects of the present invention：NMOS tube is used in the protection circuit of PMOS differential pair pipe, uses PMOS in nmos differential is to the protection circuit of pipe, during normal work, Vin+And Vin+Voltage very close to two NMOS/PMOS pipe is in linear condition, equivalent to two resistance, works as Vin+And Vin+Voltage phase difference it is larger when, one of NMOS/PMOS pipes Vgs declines, and in by state, becomes big equivalent to resistance, can preferably protect differential pair tube.
Description
Technical field
The present invention relates to a kind of protection circuit of differential pair tube.
Background technology
Differential pair tube is in operational amplifier（OPAMP）And comparator（Cpmparator）In be widely used, and in CMOS
And Bipolar（BJT）It can all be related in technique, and some semiconductor technologies determine Vin+And Vin-Between voltage difference can not be too
Greatly.
The content of the invention
In view of the defects of above-mentioned prior art is present, the purpose of the present invention is to propose to a kind of protection circuit of differential pair tube.
In order to achieve the above object, the technical solution adopted in the present invention is：A kind of protection circuit of differential pair tube, it is involved
And differential pair tube there is the first PMOS, the second PMOS and current source, and the common source of two PMOSs and current source phase
It is connected to A points, it is characterised in that：The NMOS tube that the protection circuit is connected in A points by diode circuit and two common grid forms, its
In NMOS tube M1 source electrode mutually coupled with grid, the diode circuit of the first PMOS, and NMOS tube M1 drain electrode and Vin+
It is connected；Another NMOS tube M2 source electrode mutually couples with the grid of the second PMOS, diode circuit, and NMOS tube M2 drain electrode
With Vin-It is connected.
Further, it is equipped with resistance R1 between the common source of described two PMOSs and A points.
Further, resistance R2 is equipped between the source electrode of the NMOS tube M1 and the grid of the first PMOS, it is described
Resistance R3 is equipped between NMOS tube M2 source electrode and the grid of the second PMOS.
Further, the protection circuit is between the grid of the first PMOS and NMOS tube M1 source electrode, the first PMOS
Between the grid and diode circuit of pipe, between the grid of the second PMOS and NMOS tube M2 source electrode, the grid of the second PMOS
Relatively independent adjustable resistance is respectively equipped between pole and diode circuit.
Further, the diode circuit is the one-way circulation circuit being made up of two or more Diode series.
Another technical scheme of the present invention is：A kind of protection circuit of differential pair tube, involved differential pair tube
With the first NMOS tube, the second NMOS tube and current source, and the common source of two NMOS tubes is connected on A points with current source, and it is special
Sign is：The protection circuit is connected in A point PMOSs and formed by diode circuit and two common grid, one of PMOS M3
Source electrode and grid, the diode circuit of the first NMOS tube mutually couple, and PMOS M3 drain electrode and Vin+It is connected, another
PMOS M4 source electrode and grid, the diode circuit of the second NMOS tube mutually couple, and PMOS M4 drain electrode and Vin-It is connected.
Further, it is equipped with resistance R1 between the common source of described two NMOS tubes and A points.
Further, resistance R2 is equipped between the source electrode of the PMOS M3 and the grid of the first NMOS tube, it is described
Resistance R3 is equipped between PMOS M4 source electrode and the grid of the second NMOS tube.
Further, the protection circuit is between the grid of the first NMOS tube and PMOS M3 source electrode, the first NMOS
Between the grid and diode circuit of pipe, between the grid of the second NMOS tube and PMOS M4 source electrode, the grid of the second NMOS tube
Relatively independent adjustable resistance is respectively equipped between pole and diode circuit.
Further, the diode circuit is the one-way circulation circuit being made up of two or more Diode series.
Beneficial effects of the present invention：NMOS tube is used in the protection circuit of PMOS differential pair pipe, in nmos differential to pipe
Protection circuit in use PMOS, during normal work, Vin+And Vin+Voltage very close to two NMOS/PMOS pipe is in line
Character state, equivalent to two resistance, works as Vin+And Vin+Voltage phase difference it is larger when, one of NMOS/PMOS pipes Vgs declines,
In by state, become big equivalent to resistance, can preferably protect differential pair tube.
Brief description of the drawings
Fig. 1 is the structural representation of first embodiment of the invention；
Fig. 2 is the structural representation of second embodiment of the invention；
Fig. 3 is the structural representation of third embodiment of the invention；
Fig. 4 is the structural representation of fourth embodiment of the invention；
Fig. 5 is the structural representation of eighth embodiment of the invention.
Embodiment
Differential pair tube in the present invention includes PMOS differential pair pipe and nmos differential to pipe, following examples differential pair tube
Protection circuit corresponds to PMOS differential pair pipe or nmos differential to pipe respectively.
It is the protection circuit for PMOS differential pair pipe first.
As shown in figure 1, be embodiments of the invention one, a kind of protection circuit of differential pair tube, involved differential pair tube
With the first PMOS, the second PMOS and current source, and the common source of two PMOSs is connected on A points with current source, protects
The NMOS tube that circuit is connected in A points by diode circuit and two common grid forms, one of NMOS tube M1 source electrode and first
Grid, the diode circuit of PMOS mutually couple, and NMOS tube M1 drain electrode and Vin+It is connected；Another NMOS tube M2 source electrode
Grid, diode circuit with the second PMOS mutually couple, and NMOS tube M2 drain electrode and Vin-It is connected.During normal work, Vin+
And Vin+Voltage very close to two NMOS tubes are in linear condition, equivalent to two resistance, work as Vin+And Vin+Voltage phase difference
When larger, one of NMOS tube Vgs declines, and in by state, becomes big equivalent to resistance, can preferably protect differential pair
Pipe.
As shown in Fig. 2 being embodiments of the invention two, resistance R1 is equipped between the common source and A points of two PMOSs.
Resistance R1 voltage, two NMOS tubes can be made preferably to be turned in normal work, resistance is smaller.
As shown in figure 3, it is embodiments of the invention three, based on the circuit of embodiment two, NMOS tube M1 source electrode and first
Resistance R2 is equipped between the grid of PMOS, electricity is equipped between the source electrode of the NMOS tube M2 and the grid of the second PMOS
R3 is hindered, can allowing two NMOS tubes, resistance variations are slower when off.
As shown in figure 4, it is embodiments of the invention four, protection circuit is in the grid of the first PMOS and NMOS tube M1 source
Between pole, between the grid and diode circuit of the first PMOS, between the grid of the second PMOS and NMOS tube M2 source electrode,
Relatively independent adjustable resistance is respectively equipped between the grid and diode circuit of second PMOS.
Can also further it optimize above in relation to the protection circuit of PMOS differential pair pipe, diode circuit is by two or more two
The one-way circulation circuit that pole pipe is composed in series.
Followed by the protection circuit for nmos differential to pipe.
Embodiments of the invention five, a kind of protection circuit of differential pair tube, involved differential pair tube have the first NMOS
Pipe, the second NMOS tube and current source, and the common source of two NMOS tubes is connected on A points with current source, it is characterised in that：The guarantor
Protection circuit is connected in A point PMOSs and formed by diode circuit and two common grid, one of PMOS M3 source electrode and first
Grid, the diode circuit of NMOS tube mutually couple, and PMOS M3 drain electrode and Vin+It is connected, another PMOS M4 source electrode
Grid, diode circuit with the second NMOS tube mutually couple, and PMOS M4 drain electrode and Vin-It is connected.
Embodiments of the invention six, resistance R1 is equipped between the common source and A points of two NMOS tubes.
Resistance R2, institute are equipped between the grid of embodiments of the invention seven, PMOS M3 source electrode and the first NMOS tube
State and be equipped with resistance R3 between PMOS M4 source electrode and the grid of the second NMOS tube.
As shown in figure 5, it is embodiments of the invention eight, protection circuit is in the grid of the first NMOS tube and PMOS M3 source
Between pole, between the grid and diode circuit of the first NMOS tube, between the grid of the second NMOS tube and PMOS M4 source electrode,
Relatively independent adjustable resistance is respectively equipped between the grid and diode circuit of second NMOS tube.
The protection circuit of pipe can also further be optimized above in relation to nmos differential, diode circuit is by two or more two
The one-way circulation circuit that pole pipe is composed in series.
In addition to the implementation, the present invention can also have other embodiment, all to use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within scope of the present invention.
Claims (10)
1. a kind of protection circuit of differential pair tube, involved differential pair tube has the first PMOS, the second PMOS and electric current
Source, and the common source of two PMOSs is connected on A points with current source, it is characterised in that：The protection circuit is by diode circuit
The NMOS tube composition of A points, one of NMOS tube M1 source electrode and the grid of the first PMOS, two poles are connected in two common grid
Tube loop mutually couples, and NMOS tube M1 drain electrode and Vin+It is connected；Another NMOS tube M2 source electrode and the grid of the second PMOS
Pole, diode circuit mutually couple, and NMOS tube M2 drain electrode and Vin-It is connected.
A kind of 2. protection circuit of differential pair tube according to claim 1, it is characterised in that：Described two PMOSs are total to
Resistance R1 is equipped between source electrode and A points.
A kind of 3. protection circuit of differential pair tube according to claim 2, it is characterised in that：The source electrode of the NMOS tube M1
Resistance R2 is equipped between the grid of the first PMOS, the source electrode of the NMOS tube M2 and the grid of the second PMOS are indirectly
Provided with resistance R3.
A kind of 4. protection circuit of differential pair tube according to claim 1, it is characterised in that：The protection circuit is first
The grid of PMOS towards NMOS tube M1 source electrode and diode circuit two coupling branch roads on be respectively provided with an adjustable resistance；
The second PMOS grid towards NMOS tube M2 source electrode and diode circuit two coupling branch roads on be respectively provided with one can
Resistance is adjusted, and four adjustable resistances are relatively independent.
A kind of 5. protection circuit of differential pair tube according to claim 1, it is characterised in that：The diode circuit is served as reasons
The one-way circulation circuit of two or more Diode series composition.
6. a kind of protection circuit of differential pair tube, involved differential pair tube has the first NMOS tube, the second NMOS tube and electric current
Source, and the common source of two NMOS tubes is connected on A points with current source, it is characterised in that：The protection circuit is by diode circuit
A points PMOS composition, one of PMOS M3 source electrode and grid, the diode of the first NMOS tube are connected in two common grid
Loop mutually couples, and PMOS M3 drain electrode and Vin+It is connected, another PMOS M4 source electrode and the grid of the second NMOS tube,
Diode circuit mutually couples, and PMOS M4 drain electrode and Vin-It is connected.
A kind of 7. protection circuit of differential pair tube according to claim 6, it is characterised in that：Described two NMOS tubes are total to
Resistance R1 is equipped between source electrode and A points.
A kind of 8. protection circuit of differential pair tube according to claim 7, it is characterised in that：The source electrode of the PMOS M3
Resistance R2 is equipped between the grid of the first NMOS tube, the source electrode of the PMOS M4 and the grid of the second NMOS tube are indirectly
Provided with resistance R3.
A kind of 9. protection circuit of differential pair tube according to claim 6, it is characterised in that：The protection circuit is first
The grid of NMOS tube towards PMOS M3 source electrode and diode circuit two coupling branch roads on be respectively provided with an adjustable resistance；
The grid of second NMOS tube towards PMOS M4 source electrode and diode circuit two coupling branch roads on be respectively provided with one it is adjustable
Resistance, and four adjustable resistances are relatively independent.
10. according to a kind of claim 6 to the protection circuit of described differential pair tube, it is characterised in that：The diode circuit
For the one-way circulation circuit being made up of two or more Diode series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510314651.2A CN105024658B (en) | 2015-06-10 | 2015-06-10 | A kind of protection circuit of differential pair tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510314651.2A CN105024658B (en) | 2015-06-10 | 2015-06-10 | A kind of protection circuit of differential pair tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105024658A CN105024658A (en) | 2015-11-04 |
| CN105024658B true CN105024658B (en) | 2017-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510314651.2A Active CN105024658B (en) | 2015-06-10 | 2015-06-10 | A kind of protection circuit of differential pair tube |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108259007B (en) * | 2017-12-29 | 2021-06-04 | 思瑞浦微电子科技（苏州）股份有限公司 | Enhancement circuit applied to operational amplifier conversion rate |
| CN108880488A (en) * | 2018-06-29 | 2018-11-23 | 思瑞浦微电子科技（苏州）股份有限公司 | The protection circuit of differential pair tube |
| CN110166009B (en) * | 2019-04-30 | 2022-05-13 | 思瑞浦微电子科技（苏州）股份有限公司 | Input voltage-withstanding protection framework |
| US20210384870A1 (en) * | 2020-06-05 | 2021-12-09 | Analog Devices, Inc. | Apparatus and methods for amplifier input-overvoltage protection with low leakage current |
| CN114281141B (en) * | 2021-12-24 | 2023-03-14 | 思瑞浦微电子科技(上海)有限责任公司 | Differential pair tube protection circuit |
| CN115664356B (en) * | 2022-12-08 | 2023-03-14 | 江苏润石科技有限公司 | High-voltage input stage differential pair transistor protection circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1537359A (en) * | 2001-08-02 | 2004-10-13 | �ʼҷ����ֵ��ӹɷ�����˾ | ESD Protection devices for differential pair of transistors |
| CN101036290A (en) * | 2004-10-15 | 2007-09-12 | 罗姆股份有限公司 | Operational amplifier |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6683498B2 (en) * | 2000-07-03 | 2004-01-27 | Broadcom Corporation | Protection circuit for extending headroom with off-chip inductors |
| TWI281742B (en) * | 2005-11-25 | 2007-05-21 | Novatek Microelectronics Corp | Differential input output device including electro static discharge (ESD) protection circuit |
| CN201570069U (en) * | 2009-12-02 | 2010-09-01 | 广州华工信息软件有限公司 | Military police and ETC all-purpose road system based on vehicle category intelligent detection |
| CN201577069U (en) * | 2010-04-01 | 2010-09-08 | 锦州七七七微电子有限责任公司 | Low power consumption operational amplifier |
-
2015
- 2015-06-10 CN CN201510314651.2A patent/CN105024658B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1537359A (en) * | 2001-08-02 | 2004-10-13 | �ʼҷ����ֵ��ӹɷ�����˾ | ESD Protection devices for differential pair of transistors |
| CN101036290A (en) * | 2004-10-15 | 2007-09-12 | 罗姆股份有限公司 | Operational amplifier |
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| CN105024658A (en) | 2015-11-04 |
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Address after: Xinghu Street Industrial Park of Suzhou city in Jiangsu province 215123 No. 328 Creative Industry Park 2-B304-1 Patentee after: Scarlett Ruipu microelectronics technology (Suzhou) Limited by Share Ltd Address before: Xinghu Street Industrial Park of Suzhou city in Jiangsu province 215123 No. 328 Creative Industry Park 2-B304-1 Patentee before: Scarlett Ruipu microelectronics technology (Suzhou) Co., Ltd. |