CN103823501A - Circuit for compensating temperature coefficient of reference current - Google Patents
Circuit for compensating temperature coefficient of reference current Download PDFInfo
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- CN103823501A CN103823501A CN201210470146.3A CN201210470146A CN103823501A CN 103823501 A CN103823501 A CN 103823501A CN 201210470146 A CN201210470146 A CN 201210470146A CN 103823501 A CN103823501 A CN 103823501A
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Abstract
The invention discloses a circuit for compensating temperature coefficient of reference current. The circuit is characterized by comprising a positive temperature coefficient current generating unit used for generating positive temperature coefficient current, and a negative temperature coefficient current generating unit used for generating negative temperature coefficient current, and a control voltage is led out from the positive temperature coefficient current generating unit to the negative temperature coefficient current generating unit to generate the negative temperature coefficient current and superpose and output the positive and negative temperature coefficient current after mirror imaging. By the circuit, an extra negative temperature coefficient current generating circuit can be omitted; the negative temperature coefficient current is generated by improving a positive temperature coefficient current generating circuit, so that power consumption, area and errors of the circuit are reduced, and performance is improved.
Description
Technical field
The present invention relates to a kind of SIC (semiconductor integrated circuit) and manufacture field, particularly relate to a kind of circuit that the temperature coefficient of reference current is compensated.
Background technology
Conventional reference current generating circuit need to provide reference current for other circuit modules, for effects such as biasings.Reference current generating circuit is insensitive in order to realize temperature variation, generally need to carry out temperature compensation.Basic temperature compensation is exactly that electric current to a positive temperature coefficient (PTC) and the electric current of a negative temperature coefficient superpose.Common positive temperature coefficient (PTC) electric current can be realized by triode with two-way electric current, and the electric current of negative temperature coefficient is realized divided by resistance with reference voltage.As shown in Figure 1, be the circuit that traditional temperature coefficient to reference current compensates, image current IP1 directly flows to the emitter of triode PNP1, and IP2 flows to the emitter of triode PNP2 again through resistance R 1.The emitter voltage of PNP1 is connected to the negative input of operational amplifier, and the terminal voltage that IP2 flows to resistance is connected to the electrode input end of operational amplifier.The output control image current IP1 of operational amplifier, IP2, forms negative feedback (feedback).IP3 is IP1, the image current output of IP2.Negative temperature parameter current IC is produced by extra circuit module ICTAT generator (negative temperature parameter current generation circuit).IP3 and IC are added and are output as Iout.This compensating circuit needs an extra negative temperature parameter current generation circuit to produce negative temperature parameter current, thereby has increased power consumption, area and the error of circuit, affects circuit performance.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of circuit that the temperature coefficient of reference current is compensated, can be by positive temperature coefficient (PTC) current generating circuit be improved, and save extra negative temperature parameter current and produce circuit.
For solving the problems of the technologies described above, a kind of circuit that the temperature coefficient of reference current is compensated provided by the invention, is characterized in that, comprising:
Positive temperature coefficient (PTC) current generating unit, for generation of positive temperature coefficient (PTC) electric current;
Negative temperature parameter current generation unit, for generation of negative temperature parameter current;
In described positive temperature coefficient (PTC) current generating unit, draw one and control voltage to described negative temperature parameter current generation unit, for generation of negative temperature parameter current, then by stack output after described positive and negative temperature coefficient current mirror.
Further, described positive temperature coefficient (PTC) current generating unit comprises the first nmos pass transistor, the second nmos pass transistor, the first triode, the second triode, the first resistance and an operational amplifier, the first electric current of two proportional relations and the second electric current flow to respectively the drain terminal of described the first nmos pass transistor and the second nmos pass transistor, the source of described the first nmos pass transistor is connected with the emitter of described the first triode, the source of described the second nmos pass transistor is connected with the emitter of described the second triode through described the first resistance, the grounded collector of described the first triode and the second triode, the drain electrode respectively and separately of the grid of described the first nmos pass transistor and described the second nmos pass transistor links together, the grid of described the first nmos pass transistor and described the second nmos pass transistor joins respectively at the both positive and negative polarity input end of described operational amplifier, output terminal control the first electric current and second electric current of described operational amplifier, form negative feedback, described the first nmos pass transistor or described the second nmos pass transistor output one control voltage to described negative temperature parameter current generation unit.
Further, described negative temperature parameter current generation unit comprises the 3rd nmos pass transistor and the second resistance, described positive temperature coefficient (PTC) current generating unit output one controls voltage to the grid of described the 3rd nmos pass transistor, the source of described the 3rd nmos pass transistor is through described the second resistance ground connection again, and the 3rd electric current flows to the drain terminal of described the 3rd nmos pass transistor.
Further, described the first nmos pass transistor and described the second nmos pass transistor size become integer ratio relation.
Further, described the first nmos pass transistor and described the second nmos pass transistor striking resemblances.
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 the first resistance and described the second resistance type are identical, and resistance becomes positive integer proportionate relationship.
Further, described the first resistance and described the second resistance are identical.
The circuit that the present invention compensates the temperature coefficient of reference current has saved an extra negative temperature parameter current and has produced circuit, by positive temperature coefficient (PTC) current generating circuit is improved, produce negative temperature parameter current, reduce circuit power consumption, area and error, improved performance.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the circuit diagram that traditional temperature coefficient to reference current compensates circuit;
Fig. 2 is the circuit diagram that the temperature coefficient to reference current of the present invention compensates circuit;
Fig. 3 is the output of the present invention temperature variant curve of positive and negative temperature coefficient reference current and positive and negative temperature coefficient reference current Overlay figure.
Embodiment
For your auditor can be had a better understanding and awareness object of the present invention, feature and effect, below coordinate accompanying drawing describe in detail as after.
As shown in Figure 2, be the circuit that the temperature coefficient of reference current is compensated of the present invention, the electric current I P1 of two proportional relations, IP2 flows to respectively two nmos pass transistor N1, the drain terminal of N2.The electric current wherein flowing out from the source of N1 directly flows to the emitter of triode PNP1; The electric current flowing out from the source of N2 flows to the emitter of triode PNP2, the grounded collector of triode PNP1 and PNP2 again through resistance R 1.Transistor N1, the drain electrode respectively and separately of the grid of N2 links together.And the grid of transistor N1 is connected to the negative input of operational amplifier (OPA), the grid of transistor N2 is connected to the electrode input end of operational amplifier.The output control image current IP1 of operational amplifier, IP2, forms negative feedback.IP3 is the image current output of IP1, IP2.The grid output control voltage of transistor N1 (or N2) is connected to the grid of transistor N3, and the source of N3 is through resistance R 2 ground connection again.The drain electrode of transistor N3 is connected to electric current I C1, from existing positive temperature coefficient (PTC) current generating unit, takes out one and controls voltage, this control voltage is added in to the two ends of another one positive temperature coefficient resistor, has formed the electric current I C1 of a negative temperature coefficient.IC2 is the image current output of IC1.Wherein R1, the resistance value of R2 is positive temperature coefficient (PTC), IP1, IP2, IP3 is positive temperature coefficient (PTC), IC1, IC2 is negative temperature coefficient.IP3 and IC2 can form a temperature coefficient close to 0 output current Iout through being added, and have realized tc compensation.Wherein the proportionate relationship of IP1, IP2, IP3 is 1: M: N, transistor N1, N2 keep single identical type, width and length, their number ratio is 1: M, the proportionate relationship of IC1, IC2 is A: B, wherein M, N, A, B are integer, concrete numerical value is determined according to concrete technology design, and preferred M, N, A, B are integer 1, and resistance R 1, R2 are that type is identical, resistance becomes integer ratio relation, preferably resistance ratio 1: 1.
As shown in Figure 3, in Fig. 3, the first half is positive temperature coefficient (PTC) reference current IP3 (IPTAT) and the temperature variant curve map of negative temperature coefficient reference current IC2 (ICTAT), Fig. 3 the latter half is the temperature variant curve map of output current after positive and negative temperature coefficient reference current stack, as can be seen from the figure output current Iout is along with the constant interval of lower 50 ℃ to 100 ℃ of zero temperature, numerical value change scope is 6.925-7.075 microampere, substantially remain unchanged or change minimumly, substantially having realized and formed a temperature coefficient close to 0 output current Iout.
By specific embodiment, the present invention is had been described in detail above, but these are not construed as limiting the invention.Without departing from the principles of the present invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (9)
1. the circuit temperature coefficient of reference current being compensated, is characterized in that, comprising:
Positive temperature coefficient (PTC) current generating unit, for generation of positive temperature coefficient (PTC) electric current;
Negative temperature parameter current generation unit, for generation of negative temperature parameter current;
It is characterized in that, described positive temperature coefficient (PTC) electric current produce in power supply, draw a control voltage be added to described negative temperature parameter current generation unit on the resistance of a positive temperature coefficient (PTC), for generation of negative temperature parameter current, then by stack output after described positive and negative temperature coefficient current mirror.
2. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 1, it is characterized in that, described positive temperature coefficient (PTC) current generating unit comprises the first nmos pass transistor, the second nmos pass transistor, the first triode, the second triode, the first resistance and an operational amplifier, the first electric current of two proportional relations and the second electric current flow to respectively the drain terminal of described the first nmos pass transistor and the second nmos pass transistor, the source of described the first nmos pass transistor is connected with the emitter of described the first triode, the source of described the second nmos pass transistor is connected with the emitter of described the second triode through described the first resistance, the grounded collector of described the first triode and the second triode, the drain electrode respectively and separately of the grid of described the first nmos pass transistor and described the second nmos pass transistor links together, the grid of described the first nmos pass transistor and described the second nmos pass transistor joins respectively at the both positive and negative polarity input end of described operational amplifier, output terminal control the first electric current and second electric current of described operational amplifier, form negative feedback, described the first nmos pass transistor or described the second nmos pass transistor output one control voltage to described negative temperature parameter current generation unit.
3. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 1, it is characterized in that, described negative temperature parameter current generation unit comprises the 3rd nmos pass transistor and the second resistance, described positive temperature coefficient (PTC) current generating unit output one controls voltage to the grid of described the 3rd nmos pass transistor, the source of described the 3rd nmos pass transistor is through described the second resistance ground connection again, and the 3rd electric current flows to the drain terminal of described the 3rd nmos pass transistor.
4. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 2, is characterized in that, described the first nmos pass transistor and described the second nmos pass transistor keep single identical type, width and length, and their number ratio is 1: M.
5. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 4, is characterized in that, described the first nmos pass transistor and described the second nmos pass transistor striking resemblances.
6. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 2, is characterized in that, the first electric current and the second size of current become positive integer proportionate relationship.
7. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 6, is characterized in that, the first electric current and the second size of current are identical.
8. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 2, is characterized in that, described the first resistance and described the second resistance type are identical, and resistance becomes positive integer proportionate relationship.
9. the circuit that the temperature coefficient of reference current is compensated as claimed in claim 8, is characterized in that, described the first resistance and described the 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 true CN103823501A (en) | 2014-05-28 |
| CN103823501B CN103823501B (en) | 2016-08-17 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105042778A (en) * | 2015-07-14 | 2015-11-11 | 广东美的制冷设备有限公司 | Calculation method and system for PTC heating power and air conditioner |
| CN110048675A (en) * | 2019-05-06 | 2019-07-23 | 西安微电子技术研究所 | A kind of circuit improving ambipolar track to track amplifier input bias current performance |
| CN111245432A (en) * | 2020-04-21 | 2020-06-05 | 成都启英泰伦科技有限公司 | Ring oscillator |
| CN113419107A (en) * | 2021-06-04 | 2021-09-21 | 上海华虹宏力半导体制造有限公司 | Power detector and power amplifier |
| CN113608568A (en) * | 2021-06-18 | 2021-11-05 | 西安电子科技大学 | Low-power-consumption low-voltage low-temperature-drift band-gap reference voltage source |
| CN114546021A (en) * | 2022-02-11 | 2022-05-27 | 上海华虹宏力半导体制造有限公司 | Temperature compensation BOD circuit |
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| 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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| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042778A (en) * | 2015-07-14 | 2015-11-11 | 广东美的制冷设备有限公司 | Calculation method and system for PTC heating power and air conditioner |
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| CN110048675A (en) * | 2019-05-06 | 2019-07-23 | 西安微电子技术研究所 | A kind of circuit improving ambipolar track to track amplifier input bias current performance |
| 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 |
| CN111245432A (en) * | 2020-04-21 | 2020-06-05 | 成都启英泰伦科技有限公司 | Ring oscillator |
| CN113419107A (en) * | 2021-06-04 | 2021-09-21 | 上海华虹宏力半导体制造有限公司 | Power detector and power 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 |
| CN113608568A (en) * | 2021-06-18 | 2021-11-05 | 西安电子科技大学 | Low-power-consumption low-voltage low-temperature-drift band-gap reference voltage source |
| 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 |
| CN114546021A (en) * | 2022-02-11 | 2022-05-27 | 上海华虹宏力半导体制造有限公司 | Temperature compensation BOD circuit |
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| CN103823501B (en) | 2016-08-17 |
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