CN101783661A - High-accuracy hysteresis comparator circuit and operating method thereof - Google Patents
High-accuracy hysteresis comparator circuit and operating method thereof Download PDFInfo
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- CN101783661A CN101783661A CN200910228741A CN200910228741A CN101783661A CN 101783661 A CN101783661 A CN 101783661A CN 200910228741 A CN200910228741 A CN 200910228741A CN 200910228741 A CN200910228741 A CN 200910228741A CN 101783661 A CN101783661 A CN 101783661A
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Abstract
The invention relates to a high-accuracy hysteresis comparator circuit, which comprises a hysteresis voltage generating unit and a comparator unit. The operating method comprises the following steps: acquiring signals, comparing and processing the signals, and outputting the signals. Based on not increasing the complexity of the circuit, the invention realizes accurate control of the hysteresis voltage, and has the advantages of simple circuit construction, convenient operation and strong practicability. Besides, the hysteresis voltage does not change with the process and the temperature.
Description
(1) technical field:
The present invention relates to a kind of comparator circuit and method of work thereof, especially a kind of high-accuracy hysteresis comparator circuit and method of work thereof.
(2) background technology:
General hysteresis comparator circuit all is to adopt the OTA structure, and difference is amplified the mode of passing through to increase the current mirror positive feedback on the diode connection basis that loads on, and realizes lagging characteristics.Its hysteresis voltage is to convert input voltage by image current by the I-V characteristic of metal-oxide-semiconductor to form, and its hysteresis voltage can be along with variations such as technology, temperature and changed.
(3) summary of the invention:
The objective of the invention is to design a kind of high-accuracy hysteresis comparator circuit and method of work thereof, it can overcome the deficiencies in the prior art, on the basis that does not increase circuit complexity, realize the accurate control of hysteresis voltage, circuit structure is simple, easy to operate, and hysteresis voltage does not change with technology, variations in temperature.
Technical scheme of the present invention: a kind of high-accuracy hysteresis comparator circuit, comprise input signal VP terminal, input signal VN terminal, supply voltage vdd terminal, output voltage VO UT terminal, it is characterized in that it comprises hysteresis voltage generation unit and comparator unit; Wherein, the input of said hysteresis voltage generation unit connects input signal VN terminal, supply voltage vdd terminal, output voltage VO UT terminal and ground, and its output connects the negative input of comparator unit; The positive input of said comparator unit connects input signal VP terminal, and its output connects output voltage VO UT terminal.
Above-mentioned said hysteresis voltage generation unit is made of resistance R 1, PMOS switching tube M1, nmos switch pipe M2, current source I1, current sink I2; Wherein, said resistance R 1 one ends connect input signal VN terminal, and the other end is connected with the drain terminal of PMOS switching tube M1, the drain terminal of nmos switch pipe M2 and the negative input of comparator unit; The input of said current source I1 is connected with supply voltage vdd terminal, and its output connects the source electrode of PMOS switching tube M1; The input of said current sink I2 connects the source electrode of nmos switch pipe M2, its output head grounding; The grid of said PMOS switching tube M1 is connected with the grid of nmos switch pipe M2 and the output of comparator unit.
Above-mentioned said comparator unit is made of comparator C OMP; Wherein, the positive input of said comparator C OMP connects input signal VP terminal, its negative input connects drain electrode, the drain electrode of nmos switch pipe M2 and the end of resistance R 1 of PMOS switching tube M1 in the hysteresis voltage generation unit, and its output is connected with output voltage terminal VOUT.
A kind of high-accuracy hysteresis comparator circuit is characterized in that it is applicable to hysteresis comparator circuit.
A kind of method of work of high-accuracy hysteresis comparator circuit is characterized in that it may further comprise the steps:
1. input signal terminal VN gathers applied signal voltage to be compared, through the hysteresis voltage generation unit, produces a voltage signal VNX, and VNX is subjected to the control of switching tube M1 and M2, in switching tube M1 conducting, when M2 ends, and VNX=VN+I1*R1; At switching tube M1 during by, M2 conducting, VNX=VN-I2*R1;
2. input signal terminal VP gathers input reference voltage, with signal voltage VNX through comparator C OMP relatively after, output comparative result VOUT, output voltage VO UT returns control switch pipe M1 and M2;
3. when VP＞VNX, VOUT is output as high level, and this moment, M1 was by, M2 conducting, and VNX=VN-I2*R1 wants to make the VOUT upset to be low level this moment, and VP needs less than VN-I2*R1, and promptly VP is than the little I2*R1 of VN, the hysteresis voltage when so just having formed decline; When VP＜VNX, VOUT is output as low level, and M1 conducting this moment, M2 end, and VNX=VN+I1*R1 wants to make the VOUT upset to be high level this moment, and VP needs greater than VN+I1*R1, and promptly VP is than the big I1*R1 of VN, the hysteresis voltage when so just having formed rising; And hysteresis voltage is influenced by I1*R1 and I2*R1 only.
Superiority of the present invention: 1. on the basis that does not increase circuit complexity, realize the accurate control of hysteresis voltage; 2. circuit constitutes simply, and is easy to operate, practical, and hysteresis voltage does not change with technology, variations in temperature.
(4) description of drawings:
Fig. 1 is that (wherein, Fig. 1-a is common hysteresis comparator circuit structure chart for the common hysteresis comparator circuit figure of prior art; Fig. 1-b is the result curve of common hysteresis comparator circuit under condition of different temperatures).
(wherein, Fig. 2-a is a hysteresis comparator circuit structure chart of the present invention to Fig. 2 for the circuit diagram of the related a kind of high-accuracy hysteresis comparator circuit of the present invention; Fig. 2-b is the result curve of hysteresis comparator circuit of the present invention under condition of different temperatures).
(5) embodiment:
Embodiment: a kind of high-accuracy hysteresis comparator circuit (is seen and Fig. 2-a), comprise input signal VP terminal, input signal VN terminal, supply voltage vdd terminal, output voltage VO UT terminal be it is characterized in that it comprises hysteresis voltage generation unit and comparator unit; Wherein, the input of said hysteresis voltage generation unit connects input signal VN terminal, supply voltage vdd terminal, output voltage VO UT terminal and ground, and its output connects the negative input of comparator unit; The positive input of said comparator unit connects input signal VP terminal, and its output connects output voltage VO UT terminal.
Above-mentioned said hysteresis voltage generation unit (is seen Fig. 2-a) be made of resistance R 1, PMOS switching tube M1, nmos switch pipe M2, current source I1, current sink I2; Wherein, said resistance R 1 one ends connect input signal VN terminal, and the other end is connected with the drain terminal of PMOS switching tube M1, the drain terminal of nmos switch pipe M2 and the negative input of comparator unit; The input of said current source I1 is connected with supply voltage vdd terminal, and its output connects the source electrode of PMOS switching tube M1; The input of said current sink I2 connects the source electrode of nmos switch pipe M2, its output head grounding; The grid of said PMOS switching tube M1 is connected with the grid of nmos switch pipe M2 and the output of comparator unit.
Above-mentioned said comparator unit (is seen Fig. 2-a) be made of comparator C OMP; Wherein, the positive input of said comparator C OMP connects input signal VP terminal, its negative input connects drain electrode, the drain electrode of nmos switch pipe M2 and the end of resistance R 1 of PMOS switching tube M1 in the hysteresis voltage generation unit, and its output is connected with output voltage terminal VOUT.
A kind of high-accuracy hysteresis comparator circuit is characterized in that it is applicable to hysteresis comparator circuit.
A kind of method of work of high-accuracy hysteresis comparator circuit is characterized in that it may further comprise the steps:
1. input signal terminal VN gathers applied signal voltage to be compared, through the hysteresis voltage generation unit, produces a voltage signal VNX, and VNX is subjected to the control of switching tube M1 and M2, in switching tube M1 conducting, when M2 ends, and VNX=VN+I1*R1; At switching tube M1 during by, M2 conducting, VNX=VN-I2*R1;
2. input signal terminal VP gathers input reference voltage, with signal voltage VNX through comparator C OMP relatively after, output comparative result VOUT, output voltage VO UT returns control switch pipe M1 and M2;
3. when VP＞VNX, VOUT is output as high level, and this moment, M1 was by, M2 conducting, and VNX=VN-I2*R1 wants to make the VOUT upset to be low level this moment, and VP needs less than VN-I2*R1, and promptly VP is than the little I2*R1 of VN, the hysteresis voltage when so just having formed decline; When VP＜VNX, VOUT is output as low level, and M1 conducting this moment, M2 end, and VNX=VN+I1*R1 wants to make the VOUT upset to be high level this moment, and VP needs greater than VN+I1*R1, and promptly VP is than the big I1*R1 of VN, the hysteresis voltage when so just having formed rising; And hysteresis voltage is influenced by I1*R1 and I2*R1 only.
Below with reference to accompanying drawings the present invention is described in further details:
By Fig. 1-b " result curve of common hysteresis comparator circuit under condition of different temperatures " as can be seen, when 25 ℃ of room temperatures, hysteresis voltage is about 30mV; When temperature changed to 80 ℃ by-30 ℃, hysteresis voltage became 33mV by 27mV.Variations in temperature cause hysteresis voltage changed ± 10%.This is because the hysteresis voltage of common hysteresis comparator circuit is by the Δ VGS decision of metal-oxide-semiconductor under different electric currents, and this Δ VGS influences such as temperature, technology of originally experiencing are very big.
And use the hysteresis voltage of circuit of the present invention to determine by I1*R1 and I2*R1, though I and R are influenced by temperature etc. also, but we can produce by reference voltage VREF I divided by resistance R, the temperature coefficient of the two just can be offset fully like this, result curve is shown in Fig. 2-b, when hysteresis voltage changed to 80 ℃ in temperature by-30 ℃, hysteresis voltage all remained on about 30mV.
Claims (5)
1. a high-accuracy hysteresis comparator circuit comprises input signal VP terminal, input signal VN terminal, supply voltage vdd terminal, output voltage VO UT terminal, it is characterized in that it comprises hysteresis voltage generation unit and comparator unit; Wherein, the input of said hysteresis voltage generation unit connects input signal VN terminal, supply voltage vdd terminal, output voltage VO UT terminal and ground, and its output connects the negative input of comparator unit; The positive input of said comparator unit connects input signal VP terminal, and its output connects output voltage VO UT terminal.
2. according to a kind of high-accuracy hysteresis comparator circuit described in the claim 1, it is characterized in that said hysteresis voltage generation unit is made of resistance R 1, PMOS switching tube M1, nmos switch pipe M2, current source I1, current sink I2; Wherein, said resistance R 1 one ends connect input signal VN terminal, and the other end is connected with the drain terminal of PMOS switching tube M1, the drain terminal of nmos switch pipe M2 and the negative input of comparator unit; The input of said current source I1 is connected with supply voltage vdd terminal, and its output connects the source electrode of PMOS switching tube M1; The input of said current sink I2 connects the source electrode of nmos switch pipe M2, its output head grounding; The grid of said PMOS switching tube M1 is connected with the grid of nmos switch pipe M2 and the output of comparator unit.
3. according to a kind of high-accuracy hysteresis comparator circuit described in the claim 1, it is characterized in that said comparator unit is made of comparator C OMP; Wherein, the positive input of said comparator C OMP connects input signal VP terminal, its negative input connects drain electrode, the drain electrode of nmos switch pipe M2 and the end of resistance R 1 of PMOS switching tube M1 in the hysteresis voltage generation unit, and its output is connected with output voltage terminal VOUT.
4. according to a kind of high-accuracy hysteresis comparator circuit described in the claim 1, it is characterized in that it is applicable to hysteresis comparator circuit.
5. the method for work of a high-accuracy hysteresis comparator circuit is characterized in that it may further comprise the steps:
1. input signal terminal VN gathers applied signal voltage to be compared, through the hysteresis voltage generation unit, produces a voltage signal VNX, and VNX is subjected to the control of switching tube M1 and M2, in switching tube M1 conducting, when M2 ends, and VNX=VN+I1*R1; At switching tube M1 during by, M2 conducting, VNX=VN-I2*R1;
2. input signal terminal VP gathers input reference voltage, with signal voltage VNX through comparator C OMP relatively after, output comparative result VOUT, output voltage VO UT returns control switch pipe M1 and M2;
3. when VP＞VNX, VOUT is output as high level, and this moment, M1 was by, M2 conducting, and VNX=VN-I2*R1 wants to make the VOUT upset to be low level this moment, and VP needs less than VN-I2*R1, and promptly VP is than the little I2*R1 of VN, the hysteresis voltage when so just having formed decline; When VP＜VNX, VOUT is output as low level, and M1 conducting this moment, M2 end, and VNX=VN+I1*R1 wants to make the VOUT upset to be high level this moment, and VP needs greater than VN+I1*R1, and promptly VP is than the big I1*R1 of VN, the hysteresis voltage when so just having formed rising; And hysteresis voltage is influenced by I1*R1 and I2*R1 only.
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| CN200910228741A CN101783661A (en) | 2009-11-25 | 2009-11-25 | High-accuracy hysteresis comparator circuit and operating method thereof |
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| CN200910228741A CN101783661A (en) | 2009-11-25 | 2009-11-25 | High-accuracy hysteresis comparator circuit and operating method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208233A (en) * | 2016-08-17 | 2016-12-07 | 杰华特微电子（张家港）有限公司 | Hysteresis comparator, the voltage decision circuitry applying it and battery equalizing circuit |
| CN106341146A (en) * | 2015-07-08 | 2017-01-18 | 电力集成瑞士有限公司 | Data communication receiver and power converter |
| CN108768352A (en) * | 2018-07-17 | 2018-11-06 | 上海艾为电子技术股份有限公司 | Comparator |
| CN110729989A (en) * | 2019-12-17 | 2020-01-24 | 峰岹科技（深圳）有限公司 | Hysteresis comparator circuit |
-
2009
- 2009-11-25 CN CN200910228741A patent/CN101783661A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341146A (en) * | 2015-07-08 | 2017-01-18 | 电力集成瑞士有限公司 | Data communication receiver and power converter |
| CN106341146B (en) * | 2015-07-08 | 2020-07-17 | 电力集成瑞士有限公司 | Data communication receiver and power converter |
| CN106208233A (en) * | 2016-08-17 | 2016-12-07 | 杰华特微电子（张家港）有限公司 | Hysteresis comparator, the voltage decision circuitry applying it and battery equalizing circuit |
| CN106208233B (en) * | 2016-08-17 | 2019-07-12 | 杰华特微电子（张家港）有限公司 | Hysteresis comparator, voltage decision circuitry and battery equalizing circuit using it |
| CN108768352A (en) * | 2018-07-17 | 2018-11-06 | 上海艾为电子技术股份有限公司 | Comparator |
| CN108768352B (en) * | 2018-07-17 | 2023-11-03 | 上海艾为电子技术股份有限公司 | Comparator with a comparator circuit |
| CN110729989A (en) * | 2019-12-17 | 2020-01-24 | 峰岹科技（深圳）有限公司 | Hysteresis comparator circuit |
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Application publication date: 20100721 |