CN203595907U - Anti-interference type input circuit of pulse interval measurement system - Google Patents
Anti-interference type input circuit of pulse interval measurement system Download PDFInfo
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- CN203595907U CN203595907U CN201320695701.2U CN201320695701U CN203595907U CN 203595907 U CN203595907 U CN 203595907U CN 201320695701 U CN201320695701 U CN 201320695701U CN 203595907 U CN203595907 U CN 203595907U
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Abstract
The utility model provides an anti-interference type input circuit of a pulse interval measurement system. The input circuit comprises a pulse positive input end PULSE+, a pulse negative input end PULSE- and a pulse output end OUT, wherein the pulse positive input end PULSE+ is connected with an in-phase input end of a comparison circuit through a first-order low-pass filter circuit, the pulse negative input end PULSE- is connected with a zero potential reference end, the output end of the comparison circuit is divided into two paths which are connected to the input ends of two paths of an and gate circuit respectively through a fourth resistor R4 and an RC time-delay circuit, and the output end of the and gate circuit U1D serves as the pulse output end OUT. The input circuit has the advantages that because of hysteresis comparison, pulse interval measurement can be achieved accurately and efficiently; multistage anti-interference measures are taken, all kinds of interference are effectively eliminated and signals are stable and accurate; the input circuit is reasonable in structure and low in cost and obviously improves the measurement accuracy effect.
Description
Technical field
The utility model relates to pulse interval field of measuring technique, is specifically related to a kind of input circuit of anti-interference type pulse interval measurement system.
Background technology
Pulse interval measurement is widely used in the fields such as communication, radar, electronic warfare, satellite and navigator fix.For example, the raising of radar ranging accuracy depends on the raising of transponder pulse and echo-pulse time interval measurement precision; The extracted with high accuracy of radar PRI itself is exactly a time interval measurement problem; The critical limitation factor that Multi-Station passive location precision improves is TOA measurement accuracy; And time difference measurement itself also belongs to the category of time interval measurement.Therefore precision time interval measurement method tool is of great significance, owing to there being a large amount of unknown disturbances source in actual application environment, when signal source to be checked through longer cable introduce or shielding measure improper, pulse signal can be polluted, cause porch erroneous judgement, this has a strong impact on the measuring accuracy of pulse interval.Some time interval measurement methods of current widespread use normally weaken or ignore the existence of interference noise, limit the range of application of these methods, although some method adopts conventional software and hardware filtering technique to suppress the impact of disturbing, there is again the contradiction of filter bandwidht and pulse detection system dynamic characteristic in this class filtering system.
Summary of the invention
The utility model, for the problems referred to above of prior art existence, provides a kind of input circuit of anti-interference type pulse interval measurement system.
For achieving the above object, the utility model is by the following technical solutions:
The input circuit of anti-interference type pulse interval measurement system, comprise pulse positive input terminal PULSE+, pulse negative input end PULSE-and pulse output end OUT, pulse positive input terminal PULSE+ is connected with comparator circuit in-phase input end by single order low-pass filter circuit, and pulse negative input end PULSE-is connected with zero potential reference edge; Comparator circuit output terminal separates two-way, is connected in respectively the two-way input end of AND circuit by the 4th resistance R 4 and RC delay circuit, and the output terminal of AND circuit U1D is as pulse output end OUT.
Further, single order low-pass filter circuit comprises the first resistance R 1 and the first capacitor C 1, first resistance R 1 one end other end that is connected with pulse positive input terminal PULSE+ is connected with the comparer U1A in-phase input end in comparator circuit, first capacitor C 1 one end other end ground connection GND that is connected with the comparer U1A in-phase input end in comparator circuit.
Further, the inverting input of described comparer U1A is connected with direct supply by the second resistance R 2, the earth terminal ground connection GND of comparer U1A is also connected with the second resistance R 2 by a voltage stabilizing diode D1, voltage stabilizing diode D1 negative electrode connects the second resistance R 2 and comparer U1A inverting input, voltage stabilizing diode D1 plus earth GND.
Further, described comparer U1A power end connects direct supply, and direct supply, by the second capacitor C 2 ground connection GND, is also connected with the 3rd resistance R 3 as pull-up resistor between comparer U1A power end and output terminal.
Further, described the 4th resistance R 4 one end one of input end of the other end and AND circuit U1D that is connected with comparer U1A output terminal is connected, RC delay circuit comprises that be connected with comparer U1A output terminal another input end of the other end and AND circuit U1D of the 5th resistance R 5 and the 3rd capacitor C 3, the five resistance R 5 one end is connected.
Further, described comparer U1A model is LM339AD, and AND circuit U1D model is SN74F08D.
Further, described the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5 are the homotype resistance that temperature coefficient is identical.
Further, the delay time of described RC delay circuit is
s.
Further, the 5th resistance scope in described RC delay circuit is 1～50
.
The beneficial effects of the utility model are: by sluggishness comparison, make pulse interval measurement precise and high efficiency; Multistage interference protection measure is set, effectively removes various interference, signal stabilization is accurate; Circuit structure is reasonable, and cost is low and improve measuring accuracy successful.
Accompanying drawing explanation
Fig. 1 is the utility model circuit diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Shown in Fig. 1, the input circuit of anti-interference type pulse interval measurement system of the present utility model comprises pulse positive input terminal PULSE+, pulse negative input end PULSE-and pulse output end OUT, pulse positive input terminal PULSE+ is connected with comparator circuit in-phase input end by single order low-pass filter circuit, and pulse negative input end PULSE-is connected with zero potential reference edge; Comparator circuit output terminal separates two-way, is connected in respectively the two-way input end of AND circuit by the 4th resistance R 4 and RC delay circuit, and the output terminal of AND circuit U1D is as pulse output end OUT.
In the present embodiment, single order low-pass filter circuit comprises the first resistance R 1 and the first capacitor C 1, first resistance R 1 one end other end that is connected with pulse positive input terminal PULSE+ is connected with the comparer U1A in-phase input end in comparator circuit, first capacitor C 1 one end other end ground connection GND that is connected with the comparer U1A in-phase input end in comparator circuit.
For further improving signal stabilization, the inverting input of described comparer U1A is connected with direct supply by the second resistance R 2, the earth terminal ground connection GND of comparer U1A is also connected with the second resistance R 2 by a voltage stabilizing diode D1, voltage stabilizing diode D1 negative electrode connects the second resistance R 2 and comparer U1A inverting input, voltage stabilizing diode D1 plus earth GND.
Described comparer U1A power end connects direct supply, and direct supply, by the second capacitor C 2 ground connection GND, is also connected with the 3rd resistance R 3 as pull-up resistor between comparer U1A power end and output terminal.Described the 4th resistance R 4 one end one of input end of the other end and AND circuit U1D that is connected with comparer U1A output terminal is connected, RC delay circuit comprises that be connected with comparer U1A output terminal another input end of the other end and AND circuit U1D of the 5th resistance R 5 and the 3rd capacitor C 3, the five resistance R 5 one end is connected.Described comparer U1A model is LM339AD, and AND circuit U1D model is SN74F08D.Described the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5 are the homotype resistance that temperature coefficient is identical.The delay time of described RC delay circuit is
s.The 5th resistance scope in RC delay circuit is 1～50
.
Although the utility model illustrates and describes by reference to preferred embodiment, but those of ordinary skills should understand, can be not limited to the description of above-described embodiment, in the scope of claims, can do the various variations in form and details.
Claims (9)
1. the input circuit of anti-interference type pulse interval measurement system, comprise pulse positive input terminal (PULSE+), pulse negative input end (PULSE-) and pulse output end (OUT), it is characterized in that: pulse positive input terminal (PULSE+) is connected with comparator circuit in-phase input end by single order low-pass filter circuit, and pulse negative input end PULSE-is connected with zero potential reference edge; Comparator circuit output terminal separates two-way, is connected in respectively the two-way input end of AND circuit by the 4th resistance (R4) and RC delay circuit, and the output terminal of AND circuit (U1D) is as pulse output end (OUT).
2. the input circuit of anti-interference type pulse interval measurement system according to claim 1, it is characterized in that: described single order low-pass filter circuit comprises the first resistance (R1) and the first electric capacity (C1), the first resistance (R1) one end other end that is connected with pulse positive input terminal (PULSE+) is connected with comparer (U1A) in-phase input end in comparator circuit, the first electric capacity (C1) one end other end ground connection (GND) that is connected with comparer (U1A) in-phase input end in comparator circuit.
3. the input circuit of anti-interference type pulse interval measurement system according to claim 2, it is characterized in that: the inverting input of described comparer (U1A) is connected with direct supply by the second resistance (R2), the earth terminal ground connection (GND) of comparer (U1A) is also connected with the second resistance (R2) by a voltage stabilizing diode (D1), voltage stabilizing diode (D1) negative electrode connects the second resistance (R2) and comparer (U1A) inverting input, voltage stabilizing diode (D1) plus earth (GND).
4. the input circuit of anti-interference type pulse interval measurement system according to claim 3, it is characterized in that: described comparer (U1A) power end connects direct supply, direct supply, by the second electric capacity (C2) ground connection (GND), is also connected with the 3rd resistance (R3) as pull-up resistor between comparer (U1A) power end and output terminal.
5. the input circuit of anti-interference type pulse interval measurement system according to claim 4, it is characterized in that: described the 4th resistance (R4) one end one of input end of the other end and AND circuit (U1D) that is connected with comparer (U1A) output terminal is connected, RC delay circuit comprises the 5th resistance (R5) and the 3rd electric capacity (C3), and the 5th resistance (R5) one end other end that is connected with comparer (U1A) output terminal is connected with another input end of AND circuit (U1D).
6. the input circuit of anti-interference type pulse interval measurement system according to claim 3, is characterized in that: described comparer (U1A) model is LM339AD, and AND circuit (U1D) model is SN74F08D.
7. the input circuit of anti-interference type pulse interval measurement system according to claim 3, is characterized in that: described the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the 5th resistance (R5) are the homotype resistance that temperature coefficient is identical.
8. the input circuit of anti-interference type pulse interval measurement system according to claim 3, is characterized in that: the delay time of described RC delay circuit is
s.
9. the input circuit of anti-interference type pulse interval measurement system according to claim 8, is characterized in that: the 5th resistance scope in described RC delay circuit is 1～50
.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320695701.2U CN203595907U (en) | 2013-11-05 | 2013-11-05 | Anti-interference type input circuit of pulse interval measurement system |
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| CN201320695701.2U CN203595907U (en) | 2013-11-05 | 2013-11-05 | Anti-interference type input circuit of pulse interval measurement system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460303A (en) * | 2014-12-09 | 2015-03-25 | 电子科技大学 | High-resolution time interval measuring device with temperature compensation function |
| CN104460304A (en) * | 2014-12-11 | 2015-03-25 | 电子科技大学 | High-resolution time interval measurer with function of automatic correction |
| CN105278324A (en) * | 2015-11-09 | 2016-01-27 | 电子科技大学 | Double-constant current source structure-based high-resolution fast time interval measurement circuit |
| CN105867103A (en) * | 2016-03-29 | 2016-08-17 | 张舒维 | Chip timing system |
| CN113049012A (en) * | 2021-03-10 | 2021-06-29 | 欧姆龙(上海)有限公司 | Light emitting device and photoelectric sensor |
-
2013
- 2013-11-05 CN CN201320695701.2U patent/CN203595907U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460303A (en) * | 2014-12-09 | 2015-03-25 | 电子科技大学 | High-resolution time interval measuring device with temperature compensation function |
| CN104460303B (en) * | 2014-12-09 | 2016-11-30 | 电子科技大学 | A kind of high resolution time interval measurement apparatus with temperature compensation function |
| CN104460304A (en) * | 2014-12-11 | 2015-03-25 | 电子科技大学 | High-resolution time interval measurer with function of automatic correction |
| CN105278324A (en) * | 2015-11-09 | 2016-01-27 | 电子科技大学 | Double-constant current source structure-based high-resolution fast time interval measurement circuit |
| CN105278324B (en) * | 2015-11-09 | 2017-07-18 | 电子科技大学 | A kind of high-resolution rapid time interval measuring circuit based on double constant current source structures |
| CN105867103A (en) * | 2016-03-29 | 2016-08-17 | 张舒维 | Chip timing system |
| CN113049012A (en) * | 2021-03-10 | 2021-06-29 | 欧姆龙(上海)有限公司 | Light emitting device and photoelectric sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 Termination date: 20141105 |
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| EXPY | Termination of patent right or utility model |