CN103823501B - The circuit that the temperature coefficient of reference current is compensated - Google Patents
The circuit that the temperature coefficient of reference current is compensated Download PDFInfo
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- CN103823501B CN103823501B CN201210470146.3A CN201210470146A CN103823501B CN 103823501 B CN103823501 B CN 103823501B CN 201210470146 A CN201210470146 A CN 201210470146A CN 103823501 B CN103823501 B CN 103823501B
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- temperature coefficient
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- nmos pass
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Abstract
The invention discloses a kind of circuit that the temperature coefficient of reference current is compensated, it is characterised in that including: positive temperature coefficient current generating unit, be used for producing positive temperature coefficient electric current；Negative temperature parameter current generation unit, is used for producing negative temperature parameter current；In described positive temperature coefficient current generating unit, draw one control voltage to described negative temperature parameter current generation unit, be used for producing negative temperature parameter current, then superposition after described positive and negative temperature coefficient current mirror image exported.The present invention can eliminate an extra negative temperature parameter current and produce circuit, improves by aligning temperature coefficient current generation circuit, has produced negative temperature parameter current, reduced circuit power consumption, area and error, improve performance.
Description
Technical field
The present invention relates to a kind of semiconductor integrated circuit and manufacture field, particularly relate to a kind of temperature to reference current
The circuit that degree coefficient compensates.
Background technology
Conventional reference current generating circuit needs to provide reference current for other circuit modules, makees for biasing etc.
With.Reference current generating circuit is insensitive in order to realize variations in temperature, it is generally required to carry out temperature-compensating.Base
This temperature compensation is exactly that the electric current of the electric current to a positive temperature coefficient and a negative temperature coefficient is carried out
Superposition.Common positive temperature coefficient electric current can use two-way electric current to be realized by audion, negative temperature coefficient
Electric current use reference voltage realize divided by resistance.As it is shown in figure 1, be traditional temperature to reference current
The circuit that coefficient compensates, image current IP1 flows directly into the emitter stage of audion PNP1, and IP2 is through electricity
Resistance R1 flows to the emitter stage of audion PNP2 again.The emitter voltage of PNP1 is connected to the negative of operational amplifier
Pole input, IP2 flows to a terminal voltage of resistance and is connected to the electrode input end of operational amplifier.Operation amplifier
The output of device controls image current IP1, IP2, forms negative feedback (feedback).IP3 is the mirror of IP1, IP2
Image current exports.Negative temperature parameter current IC is by extra circuit module ICTAT generator (negative temperature
Coefficient current produces circuit) produce.IP3 and IC is added and is output as Iout.This compensation circuit needs a volume
Outer negative temperature parameter current produces circuit and produces negative temperature parameter current, thus add circuit power consumption,
Area and error, affect circuit performance.
Summary of the invention
The technical problem to be solved is to provide what a kind of temperature coefficient to reference current compensated
Circuit, can improve by aligning temperature coefficient current generation circuit, save extra negative temperature parameter current
Produce circuit.
For solving above-mentioned technical problem, a kind of temperature coefficient to reference current that the present invention provides compensates
Circuit, it is characterised in that including:
Positive temperature coefficient current generating unit, is used for producing positive temperature coefficient electric current；
Negative temperature parameter current generation unit, is used for producing negative temperature parameter current；
In described positive temperature coefficient current generating unit, draw one control voltage to described negative temperature parameter current
Generation unit, is used for producing negative temperature parameter current, then by folded after described positive and negative temperature coefficient current mirror image
Add output.
Further, described positive temperature coefficient current generating unit includes the first nmos pass transistor, the 2nd NMOS
Transistor, the first audion, the second audion, the first resistance and an operational amplifier, two proportional relations
The first electric current and the second electric current flow to described first nmos pass transistor and the leakage of the second nmos pass transistor respectively
End, the source of described first nmos pass transistor is connected with the emitter stage of described first audion, described 2nd NMOS
The source of transistor is connected through the emitter stage of described first resistance with described second audion, described one or three pole
Pipe and the grounded collector of the second audion, described first nmos pass transistor and described second nmos pass transistor
Grid links together with respective drain electrode respectively, described first nmos pass transistor and described 2nd NMOS crystal
The grid of pipe connects respectively at the both positive and negative polarity input of described operational amplifier, the outfan of described operational amplifier
Control the first electric current and the second electric current, form negative feedback, described first nmos pass transistor or described 2nd NMOS
Transistor output one controls voltage to described negative temperature parameter current generation unit.
Further, described negative temperature parameter current generation unit includes the 3rd nmos pass transistor and the second resistance,
Described positive temperature coefficient current generating unit output one controls voltage to the grid of described 3rd nmos pass transistor,
The source of described 3rd nmos pass transistor flows to the described 3rd through described second resistance ground connection again, the 3rd electric current
The drain terminal of nmos pass transistor.
Further, described first nmos pass transistor and described second nmos pass transistor size become integer ratio to close
System.
Further, described first nmos pass transistor and described second nmos pass transistor are the same.
Further, the first electric current and the second size of current become positive integer proportionate relationship.
Further, the first electric current and the second size of current are identical.
Further, described first resistance and described second resistance type are identical, and resistance becomes positive integer proportionate relationship.
Further, described first resistance and described second resistance are identical.
The present invention eliminates an extra negative temperature coefficient to the circuit that the temperature coefficient of reference current compensates
Current generating circuit, improves by aligning temperature coefficient current generation circuit, has produced negative temperature coefficient
Electric current, reduces circuit power consumption, area and error, improves performance.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings:
The temperature coefficient to reference current that Fig. 1 is traditional compensates the circuit diagram of circuit；
Fig. 2 is the circuit diagram that the temperature coefficient to reference current of the present invention compensates circuit；
Fig. 3 be the present invention export the curve that varies with temperature of positive and negative temperature coefficient reference current and positive and negative temperature
Degree coefficient reference current Overlay figure.
Detailed description of the invention
For enabling your auditor that the purpose of the present invention, feature and effect to be had a better understanding and awareness,
After below coordinating detailed description such as.
As in figure 2 it is shown, the circuit compensated for the temperature coefficient to reference current of the present invention, two become ratio
The electric current IP1, IP2 of example relation flows to two nmos pass transistor N1, the drain terminal of N2 respectively.Wherein from the source of N1
The electric current that end flows out flows directly into the emitter stage of audion PNP1；From the electric current of the source outflow of N2 through resistance
R1 flows to the emitter stage of audion PNP2, the grounded collector of audion PNP1 and PNP2 again.Transistor N1, N2
Grid link together with respective drain electrode respectively.And the grid of transistor N1 is connected to operational amplifier
(OPA) negative input, the grid of transistor N2 is connected to the electrode input end of operational amplifier.Computing is put
The output of big device controls image current IP1, IP2, forms negative feedback.IP3 is that the image current of IP1, IP2 is defeated
Go out.The grid output of transistor N1 (or N2) controls voltage and is connected to the grid of transistor N3, the source of N3
Through resistance R2 ground connection again.The drain electrode of transistor N3 is connected to electric current IC1, i.e. from existing positive temperature coefficient
Current generating unit takes out one and controls voltage, this control voltage is added in another one positive temperature coefficient resistor
Two ends, define the electric current IC1 of a negative temperature coefficient.IC2 is the image current output of IC1.Wherein
The resistance value of R1, R2 is positive temperature coefficient, and IP1, IP2, IP3 are positive temperature coefficient, and IC1, IC2 are negative temperature
Coefficient.IP3 and IC2 then can form, through being added, the output electric current Iout that a temperature coefficient is close to 0,
I.e. achieve tc compensation.Wherein the proportionate relationship of IP1, IP2, IP3 is 1: M: N, transistor N1,
N2 keeps single identical type, width and length, and their number ratio is 1: M, the ratio of IC1, IC2
Example relation is A: B, and wherein M, N, A, B are integer, and concrete numerical value is depending on concrete technology designs, excellent
M, N, A, B of choosing are integer 1, and resistance R1, R2 are that type is identical, and resistance becomes integer ratio relation, excellent
Choosing for resistance ratio 1: 1.
As it is shown on figure 3, top half is positive temperature coefficient reference current IP3 (IPTAT) and subzero temperature in Fig. 3
The curve chart that degree coefficient reference current IC2 (ICTAT) varies with temperature, Fig. 3 the latter half is positive and negative temperature
The curve chart that output electric current after degree coefficient reference current superposition varies with temperature, as can be seen from the figure exports electricity
Stream Iout is along with the constant interval of lower 50 DEG C to 100 DEG C of zero temperature, and change in value scope is 6.925-7.075
Microampere, is held essentially constant or changes minimum, substantially achieves and forms the output that a temperature coefficient is close to 0
Electric current Iout.
Above by specific embodiment, the present invention is described in detail, but these have not been constituted the present invention
Restriction.Without departing from the principles of the present invention, those skilled in the art it may also be made that many deformation and
Improving, these also should be regarded as protection scope of the present invention.
Claims (8)
1. the circuit that the temperature coefficient of reference current is compensated, it is characterised in that including:
Positive temperature coefficient current generating unit, is used for producing positive temperature coefficient electric current；
Negative temperature parameter current generation unit, is used for producing negative temperature parameter current；
It is characterized in that, produce at described positive temperature coefficient electric current and power supply is drawn a control voltage be added in described negative temperature parameter current generation unit on the resistance of a positive temperature coefficient, for producing negative temperature parameter current, then superposition after described positive and negative temperature coefficient current mirror image is exported；
nullDescribed positive temperature coefficient current generating unit includes the first nmos pass transistor、Second nmos pass transistor、First audion、Second audion、First resistance and an operational amplifier，First electric current of two proportional relations and the second electric current flow to described first nmos pass transistor and the drain terminal of the second nmos pass transistor respectively，The source of described first nmos pass transistor is connected with the emitter stage of described first audion，The source of described second nmos pass transistor is connected through the emitter stage of described first resistance with described second audion，Described first audion and the grounded collector of the second audion，The grid of described first nmos pass transistor and described second nmos pass transistor links together with respective drain electrode respectively，The grid of described first nmos pass transistor and described second nmos pass transistor is connected with the both positive and negative polarity input of described operational amplifier respectively，The outfan of described operational amplifier controls the first electric current and the second electric current，Form negative feedback，Described first nmos pass transistor or described second nmos pass transistor output one control voltage to described negative temperature parameter current generation unit，Described negative temperature parameter current generation unit includes the 3rd nmos pass transistor and the second resistance.
2. the circuit as claimed in claim 1 temperature coefficient of reference current compensated, it is characterized in that, described positive temperature coefficient current generating unit output one controls voltage to the grid of described 3rd nmos pass transistor, the source of described 3rd nmos pass transistor flows to the drain terminal of described 3rd nmos pass transistor through described second resistance ground connection again, the 3rd electric current.
3. the circuit as claimed in claim 1 temperature coefficient of reference current compensated, it is characterised in that described first nmos pass transistor and described second nmos pass transistor keep single identical type, and width and length, their number ratio is 1:M.
4. the circuit as claimed in claim 3 temperature coefficient of reference current compensated, it is characterised in that described first nmos pass transistor and described second nmos pass transistor are the same.
5. the circuit as claimed in claim 1 temperature coefficient of reference current compensated, it is characterised in that the first electric current and the second size of current become positive integer proportionate relationship.
6. the circuit as claimed in claim 5 temperature coefficient of reference current compensated, it is characterised in that the first electric current and the second size of current are identical.
7. the circuit as claimed in claim 1 temperature coefficient of reference current compensated, it is characterised in that described first resistance and described second resistance type are identical, and resistance becomes positive integer proportionate relationship.
8. the circuit as claimed in claim 7 temperature coefficient of reference current compensated, it is characterised in that described first resistance and described second resistance are identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210470146.3A CN103823501B (en) | 2012-11-19 | 2012-11-19 | The circuit that the temperature coefficient of reference current is compensated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210470146.3A CN103823501B (en) | 2012-11-19 | 2012-11-19 | The circuit that the temperature coefficient of reference current is compensated |
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| CN103823501A CN103823501A (en) | 2014-05-28 |
| CN103823501B true CN103823501B (en) | 2016-08-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105042778B (en) * | 2015-07-14 | 2018-06-05 | 广东美的制冷设备有限公司 | The computational methods and its system and air conditioner of PTC heating powers |
| CN110048675B (en) * | 2019-05-06 | 2023-03-21 | 西安微电子技术研究所 | Circuit for improving input bias current performance of bipolar rail-to-rail operational amplifier |
| CN113419107B (en) * | 2021-06-04 | 2024-01-23 | 上海华虹宏力半导体制造有限公司 | Power detector and power amplifier |
| CN113608568B (en) * | 2021-06-18 | 2022-08-12 | 西安电子科技大学 | Low-power-consumption low-voltage low-temperature-drift band-gap reference voltage source |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020070722A1 (en) * | 2000-11-29 | 2002-06-13 | Kang Han Kook | Apparatus for generating constant reference voltage signal regardless of temperature change |
| US20020125938A1 (en) * | 2000-12-27 | 2002-09-12 | Young Hee Kim | Current mirror type bandgap reference voltage generator |
| CN101034535A (en) * | 2006-03-08 | 2007-09-12 | 天利半导体（深圳）有限公司 | Temperature coefficient adjustable reference circuit |
| CN101276227A (en) * | 2007-03-26 | 2008-10-01 | 松下电器产业株式会社 | Reference current circuit |
| CN101453270A (en) * | 2007-12-04 | 2009-06-10 | 无锡江南计算技术研究所 | Laser driver and temperature compensation circuit thereof |
| CN102654780A (en) * | 2012-05-17 | 2012-09-05 | 无锡硅动力微电子股份有限公司 | Temperature compensation current reference circuit applied to integrated circuit |
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2012
- 2012-11-19 CN CN201210470146.3A patent/CN103823501B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020070722A1 (en) * | 2000-11-29 | 2002-06-13 | Kang Han Kook | Apparatus for generating constant reference voltage signal regardless of temperature change |
| US20020125938A1 (en) * | 2000-12-27 | 2002-09-12 | Young Hee Kim | Current mirror type bandgap reference voltage generator |
| CN101034535A (en) * | 2006-03-08 | 2007-09-12 | 天利半导体（深圳）有限公司 | Temperature coefficient adjustable reference circuit |
| CN101276227A (en) * | 2007-03-26 | 2008-10-01 | 松下电器产业株式会社 | Reference current circuit |
| CN101453270A (en) * | 2007-12-04 | 2009-06-10 | 无锡江南计算技术研究所 | Laser driver and temperature compensation circuit thereof |
| CN102654780A (en) * | 2012-05-17 | 2012-09-05 | 无锡硅动力微电子股份有限公司 | Temperature compensation current reference circuit applied to integrated circuit |
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| CN103823501A (en) | 2014-05-28 |
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