CN201550089U - Delay comparator for laser bar-code detection - Google Patents
Delay comparator for laser bar-code detection Download PDFInfo
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- CN201550089U CN201550089U CN2009202508588U CN200920250858U CN201550089U CN 201550089 U CN201550089 U CN 201550089U CN 2009202508588 U CN2009202508588 U CN 2009202508588U CN 200920250858 U CN200920250858 U CN 200920250858U CN 201550089 U CN201550089 U CN 201550089U
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Abstract
A delay comparator for laser bar-code detection comprises a delay voltage generating unit and a comparator unit. The delay comparator has the benefits that (1) the delay comparator realizes accuracy control of the delay voltage without increasing the circuit complexity; and (2) the delay comparator has simple circuit structure, convenient operation and high practicability, and the delay voltage does not change with the change of process or temperature.
Description
(1) technical field:
The utility model relates to a kind of comparator circuit, and especially a kind of laser bar code detects uses hysteresis comparator.
(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) utility model content:
The purpose of this utility model is to design a kind of laser bar code detection hysteresis comparator, 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.
The technical solution of the utility model: a kind of laser bar code detects uses hysteresis comparator, 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 laser bar code detects and uses hysteresis comparator, it is characterized in that it is applicable to hysteresis comparator circuit.
Method of work of the present utility model:
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 utility model: 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).
Fig. 2 is that the related a kind of laser bar code of the utility model detects circuit diagram with hysteresis comparator (wherein, Fig. 2-a is the utility model hysteresis comparator circuit structure chart; Fig. 2-b is the result curve of the utility model hysteresis comparator circuit under condition of different temperatures).
(5) embodiment:
Embodiment: a kind of laser bar code detects with hysteresis comparator (sees Fig. 2-a), 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 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.
Below with reference to accompanying drawings the utility model 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 the utility model circuit 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 (3)
1. a laser bar code detects and uses hysteresis comparator, 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. detect according to a kind of laser bar code described in the claim 1 and use hysteresis comparator, 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. detect according to a kind of laser bar code described in the claim 1 and use hysteresis comparator, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202508588U CN201550089U (en) | 2009-11-25 | 2009-11-25 | Delay comparator for laser bar-code detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202508588U CN201550089U (en) | 2009-11-25 | 2009-11-25 | Delay comparator for laser bar-code detection |
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| Publication Number | Publication Date |
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| CN201550089U true CN201550089U (en) | 2010-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202508588U Expired - Fee Related CN201550089U (en) | 2009-11-25 | 2009-11-25 | Delay comparator for laser bar-code detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124950B (en) * | 2013-04-26 | 2017-04-05 | 快捷半导体(苏州)有限公司 | Reversing the current blocks comparator |
| CN111766506A (en) * | 2020-07-03 | 2020-10-13 | 福建师范大学 | Sensor integrated circuit for detecting CMOS process deviation |
-
2009
- 2009-11-25 CN CN2009202508588U patent/CN201550089U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124950B (en) * | 2013-04-26 | 2017-04-05 | 快捷半导体(苏州)有限公司 | Reversing the current blocks comparator |
| CN111766506A (en) * | 2020-07-03 | 2020-10-13 | 福建师范大学 | Sensor integrated circuit for detecting CMOS process deviation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20131125 |