CN204089754U - A kind of small size low-power consumption high speed current comparator - Google Patents
A kind of small size low-power consumption high speed current comparator Download PDFInfo
- Publication number
- CN204089754U CN204089754U CN201420568048.8U CN201420568048U CN204089754U CN 204089754 U CN204089754 U CN 204089754U CN 201420568048 U CN201420568048 U CN 201420568048U CN 204089754 U CN204089754 U CN 204089754U
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- China
- Prior art keywords
- current
- transistor
- drain electrode
- composition
- nmos pass
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Abstract
There is provided a kind of small size low-power consumption high speed current comparator, transistor M
1, M
2, M
3and M
4composition improves the common-source common-gate current mirror structure of output impedance and image current precision, wherein transistor M
2and M
4grid and drain electrode be joined together to form diode connected mode, transistor M
5and M
6composition current-mirror structure, wherein transistor M
5grid and drain electrode be joined together to form diode connected mode, be connected to M
6grid, by input current I
inbe mirrored to by transistor M
1, M
3with transistor M
6the current branch of composition, transistor M
1drain electrode and M
3source electrode be connected, transistor M
3drain electrode and transistor M
6drain electrode be connected, meanwhile, threshold current I
thalso be mirrored onto by transistor M
1, M
3with transistor M
6the current branch of composition.The utility model quiescent current is input current and threshold current sum, and without the need to consuming extracurrent, power consumption is lower.
Description
Technical field
The utility model relates to a kind of small size low-power consumption high speed current comparator, is mainly used in analog-digital converter (ADC) and power supply chip current-limiting protection circuit.
Background technology
Conventional current comparator, as shown in Figure 1, its circuit comprises resistance R
a, resistance R
bwith voltage comparator, wherein a R
a=R
b.Input current I
inwith threshold current I
threspectively by resistance R
awith resistance R
bconvert voltage V to
awith voltage V
b, then these two voltages are connected respectively to the negative phase end of a voltage comparator (operational amplifier) and positive terminal compares, thus obtain output voltage V
out.When input current is greater than threshold current, V
abe greater than V
b, output voltage is electronegative potential.When input current is less than threshold current, V
abe less than V
b, output voltage is high potential.This structure is voltage mode, and the current comparator based on operational amplifier more easily realizes.But, there is following shortcoming: one is need employing operational amplifier in this current comparator, because this increasing power consumption and chip area; Two is the bandwidth sum speed that the reaction speed of this current comparator is limited to operational amplifier self, increases the design difficulty of operational amplifier; Three is that the precision of this current comparator is by resistance precision and operational amplifier offset voltage influence.Above-mentioned defect,
Utility model content
The technical problem that the utility model solves: provide a kind of small size low-power consumption high speed current comparator, under it is operated in current-mode, compare traditional voltage mode, reaction speed is faster.In addition, this circuit does not need operational amplifier and resistance, and structure is simple, easy realization, the transistor number of employing is less, substantially reduces chip area, and the quiescent current of this circuit is input current and threshold current sum, and without the need to consuming extracurrent, power consumption is lower.
The technical solution adopted in the utility model: a kind of small size low-power consumption high speed current comparator, nmos pass transistor M
1, M
2, M
3and M
4composition improves the common-source common-gate current mirror structure of output impedance and image current precision, wherein nmos pass transistor M
2and M
4grid and drain electrode be joined together to form diode connected mode, PMOS transistor M
5and M
6composition current-mirror structure, wherein PMOS transistor M
5grid and drain electrode be joined together to form diode connected mode, be connected to M
6grid, by input current I
inbe mirrored to by nmos pass transistor M
1, M
3with PMOS transistor M
6the current branch of composition, nmos pass transistor M
1drain electrode and M
3source electrode be connected, nmos pass transistor M
3drain electrode and PMOS transistor M
6drain electrode be connected, meanwhile, threshold current I
thalso be mirrored onto by nmos pass transistor M
1, M
3with PMOS transistor M
6the current branch of composition.
The utility model advantage compared with prior art:
1, under being operated in current-mode, compare traditional voltage mode, reaction speed is faster;
2, this circuit does not need operational amplifier and resistance, and structure is simple, and easily realize, the transistor number of employing is less, thus substantially reduces chip area;
3, the quiescent current of this circuit is input current and threshold current sum, and without the need to consuming extracurrent, therefore power consumption is lower.
Accompanying drawing explanation
Fig. 1 is conventional current comparator circuit structure chart;
Fig. 2 is circuit structure diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing 2, a kind of embodiment of the present utility model is described.
A kind of small size low-power consumption high speed current comparator, V
ddfor supply voltage, I
thfor the threshold current of setting, I
infor input current.Nmos pass transistor M
1, M
2, M
3and M
4composition improves the common-source common-gate current mirror structure of output impedance and image current precision, wherein nmos pass transistor M
2and M
4grid and drain electrode be joined together to form diode connected mode, PMOS transistor M
5and M
6composition current-mirror structure, wherein PMOS transistor M
5grid and drain electrode be joined together to form diode connected mode, be connected to M
6grid, by input current I
inbe mirrored to by nmos pass transistor M
1, M
3with PMOS transistor M
6the current branch of composition, nmos pass transistor M
1drain electrode and M
3source electrode be connected, nmos pass transistor M
3drain electrode and PMOS transistor M
6drain electrode be connected, meanwhile, threshold current I
thalso be mirrored onto by nmos pass transistor M
1, M
3with PMOS transistor M
6the current branch of composition.
As input current I
inwith threshold current I
thtime equal, circuit is in poised state, output voltage V
outfor intermediate potential.As input current I
inbe greater than threshold current I
thtime, nmos pass transistor M
4grid voltage V
auprise, make to pass through M
3electric current be greater than threshold current I
th, thus output voltage step-down is until earth potential.Now, due to transistor M
1and M
3source, drain voltage difference be 0, so be 0 by electric current.As input current I
inbe less than threshold current I
thtime, nmos pass transistor M
4grid voltage V
astep-down, makes to pass through M
3electric current be less than threshold current I
th, thus output voltage raises until supply voltage V
dd, now, due to PMOS transistor M
6source, drain voltage difference be 0, so be 0 by electric current.Can see, at input current I
inwith threshold current I
thin unequal situation, the electric current of this circuitry consumes is only threshold current I
thwith input current I
insum, middle comparison current branch does not consume extra electric current.
Above-described embodiment, just preferred embodiment of the present utility model, is not used for limiting the utility model practical range, therefore all equivalence changes done with content described in the utility model claim, all should be included within the utility model right.
Claims (1)
1. a small size low-power consumption high speed current comparator, is characterized in that: nmos pass transistor M
1, M
2, M
3and M
4composition improves the common-source common-gate current mirror structure of output impedance and image current precision, wherein nmos pass transistor M
2and M
4grid and drain electrode be joined together to form diode connected mode, PMOS transistor M
5and M
6composition current-mirror structure, wherein PMOS transistor M
5grid and drain electrode be joined together to form diode connected mode, be connected to M
6grid, by input current I
inbe mirrored to by nmos pass transistor M
1, M
3with PMOS transistor M
6the current branch of composition, nmos pass transistor M
1drain electrode and M
3source electrode be connected, nmos pass transistor M
3drain electrode and PMOS transistor M
6drain electrode be connected, meanwhile, threshold current I
thalso be mirrored onto by nmos pass transistor M
1, M
3with PMOS transistor M
6the current branch of composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420568048.8U CN204089754U (en) | 2014-09-29 | 2014-09-29 | A kind of small size low-power consumption high speed current comparator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420568048.8U CN204089754U (en) | 2014-09-29 | 2014-09-29 | A kind of small size low-power consumption high speed current comparator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204089754U true CN204089754U (en) | 2015-01-07 |
Family
ID=52182420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420568048.8U Expired - Fee Related CN204089754U (en) | 2014-09-29 | 2014-09-29 | A kind of small size low-power consumption high speed current comparator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204089754U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680431A (en) * | 2016-03-25 | 2016-06-15 | 中国电子科技集团公司第五十八研究所 | Adjustable current-limiting protection circuit |
| IT201700084511A1 (en) * | 2017-07-25 | 2019-01-25 | St Microelectronics Srl | COMPARATOR CIRCUIT, EQUIPMENT AND CORRESPONDENT PROCEDURE |
| US10917008B2 (en) | 2019-01-18 | 2021-02-09 | Upi Semiconductor Corp. | Output stage circuit of power conversion circuit |
| CN113746312A (en) * | 2021-09-02 | 2021-12-03 | 南京微盟电子有限公司 | Current-limiting protection circuit of bipolar process switching power supply |
| CN114665849A (en) * | 2022-02-23 | 2022-06-24 | 电子科技大学 | High-precision current comparator |
| CN114705904A (en) * | 2022-04-12 | 2022-07-05 | 苏州贝克微电子股份有限公司 | High-precision overcurrent detection circuit |
-
2014
- 2014-09-29 CN CN201420568048.8U patent/CN204089754U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680431A (en) * | 2016-03-25 | 2016-06-15 | 中国电子科技集团公司第五十八研究所 | Adjustable current-limiting protection circuit |
| IT201700084511A1 (en) * | 2017-07-25 | 2019-01-25 | St Microelectronics Srl | COMPARATOR CIRCUIT, EQUIPMENT AND CORRESPONDENT PROCEDURE |
| US10797688B2 (en) | 2017-07-25 | 2020-10-06 | Stmicroelectronics S.R.L. | Comparator circuit, corresponding device and method |
| US10917008B2 (en) | 2019-01-18 | 2021-02-09 | Upi Semiconductor Corp. | Output stage circuit of power conversion circuit |
| CN113746312A (en) * | 2021-09-02 | 2021-12-03 | 南京微盟电子有限公司 | Current-limiting protection circuit of bipolar process switching power supply |
| CN113746312B (en) * | 2021-09-02 | 2023-03-28 | 南京微盟电子有限公司 | Current-limiting protection circuit of bipolar process switching power supply |
| CN114665849A (en) * | 2022-02-23 | 2022-06-24 | 电子科技大学 | High-precision current comparator |
| CN114665849B (en) * | 2022-02-23 | 2023-04-07 | 电子科技大学 | High-precision current comparator |
| CN114705904A (en) * | 2022-04-12 | 2022-07-05 | 苏州贝克微电子股份有限公司 | High-precision overcurrent detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20170929 |