CN205405090U - Pulse time interval measuring circuit based on integrated phase detection discriminator - Google Patents
Pulse time interval measuring circuit based on integrated phase detection discriminator Download PDFInfo
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- CN205405090U CN205405090U CN201620233453.3U CN201620233453U CN205405090U CN 205405090 U CN205405090 U CN 205405090U CN 201620233453 U CN201620233453 U CN 201620233453U CN 205405090 U CN205405090 U CN 205405090U
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Abstract
The utility model discloses a pulse time interval measuring circuit based on integrated phase detection discriminator, including two limit circuit, integrated phase detection discriminator, the active proportional -integral -filter of differential input, AD converter, programmable frequency divider, microcontroller and display. Utilize the clipper -limiter to two way input pulse amplitude limitings, compare obtaining the phase difference pulse mutually by integrated phase detection discriminator, after integral filter, AD conversion, calculate by microcontroller and obtain the phase difference, to go the same way the input pulse again through the frequency divider frequency division, input microcontroller's a port, measure the cycle of pulse, according to phase difference and the pulse period who records, microcontroller calculates the time interval who obtains two tunnel pulses. It is technological to use multipurposely the high -speed looks of reflecting, analog -to -digital conversion and high -speed frequency division, realizes the time interval accurate measurement between two way same frequency pulse signal in the broad frequency range under microcontroller control, has still expanded the application of phase detection discriminator.
Description
Technical field
This utility model relates to the pulse signal interval measurement technology of electronic measuring technology field, is specifically related to a kind of pulse signal interval measuring circuit based on integrated phase detection discriminator.
Background technology
Same frequency pulse signal interval measurement is a requisite content in signal measurement, and national economy and national defense construction is significant, has a wide range of applications in fields such as modern communications, positioning timing, space flight measurement and control, digital oscilloscopes.At present, pulse interval measuring circuit mainly has analog measuring circuit and the big class of digital measuring circuit two, and analog measuring circuit be unable to do without the process of analog digital conversion, it is easy to by the impact of external interference, certainty of measurement can not be significantly high；And digital measuring circuit does not need analog digital conversion, certainty of measurement is high, but needs the support of large scale integrated circuit ASIC (special IC), and complex process, production cost are high.
Summary of the invention
This utility model is based on integrated phase detection discriminator, by means of A/D conversion and programmable frequency divider, under the control and computing of microcontroller, measure the phase contrast and the cycle that obtain two same frequency pulse signals respectively, then computing obtains the interval of two pulses, circuit is simple, measure accurately, can measured frequency scope very wide, also extend the range of application of integrated phase detection discriminator.
Pulse interval measuring circuit based on integrated phase detection discriminator of the present utility model, including two identical amplitude limiter circuits, integrated phase detection discriminator MCH12140, the active proportional-integral filter of Differential Input formula, A/D converter AD976A, programmable frequency divider, microcontroller STC12C5204AD and display, it is characterized in that: input pulse 1, after amplitude limiter circuit 1, is input to the input R of integrated phase detection discriminator MCH12140；Input pulse 2, after amplitude limiter circuit 2, is input to the input V of integrated phase detection discriminator MCH12140；The outfan of described integrated phase detection discriminator MCH12140 It is connected respectively to two inputs of the active proportional-integral filter of Differential Input formula；The output signal of described active proportional-integral filter is input to the analog voltage input of A/D converter AD976A；The digital signal of described A/D converter AD976A output is input to microcontroller STC12C5204AD；The digital signal that A/D converter is changed by described microcontroller STC12C5204AD is calculated, and obtains the phase contrast of two input pulses；Input pulse Zhong mono-road is connected to the input of programmable frequency divider, the frequency dividing ratio of the preset programmable frequency divider of STC12C5204AD；The output of frequency divider is connected to the intervalometer of the rising edge of a pulse startup STC12C5204AD of port input Pn, a Pn of STC12C5204AD, and the next pulse rising edge of Pn makes the intervalometer of STC12C5204AD stop, recording timer data；Repeat 10 times to measure, STC12C5204AD calculate and take the meansigma methods measured 10 times, and obtain the cycle T of input pulse according to the frequency dividing ratio of preset programmable frequency divider；According to the phase contrast recorded and cycle T, STC12C5204AD calculate the interval obtaining two input pulse signals, and measurement result is delivered to display show.
Pulse interval measuring circuit based on integrated phase detection discriminator of the present utility model, the described active proportional-integral filter of Differential Input formula is made up of with peripheral resistance, capacity cell integrated operational amplifier LT1028.
The beneficial effects of the utility model are: utilize integrated phase frequency detector and A/D converter, first obtain the phase contrast between two pulse signals；Reduce the frequency of input pulse again through frequency divider, repetitive measurement direct by microcontroller obtains the pulse period accurately, finally calculates the interval obtaining two pulses.Measuring circuit is relatively simple, and precision is high, can survey signal frequency height.Meanwhile, the application of integrated phase detection discriminator is extended.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model；Fig. 2 is partial circuit diagram of the present utility model, containing two amplitude limiter circuits, phase detection discriminator MCH12140, the active proportional-integral filter of Differential Input formula, programmable frequency divider HMC394；Accompanying drawing 3 is phase detection discriminator working waveform figure of the present utility model.
In Fig. 2: 1 amplitude limiter circuit 1,2 amplitude limiter circuit 2, the 3 active proportional-integral filter of Differential Input formula, 4 programmable frequency dividers.
Detailed description of the invention
In conjunction with accompanying drawing, pulse interval measuring circuit based on integrated phase detection discriminator of the present utility model, it include amplitude limiter circuit 1 (1), amplitude limiter circuit 2 (2), phase detection discriminator MCH12140, the active proportional-integral filter of Differential Input formula (3), A/D converter AD976A, programmable frequency divider (4), microcontroller STC12C5204AD, display, auxiliary resistance R3 and+5V ,-5V, etc. necessary working power.
The structure of two-way amplitude limiter circuit is identical with parameter, resistance R1, R2 take suitable value and make 2 resting potentials of A, B in Fig. 2 amplitude limiter circuit be+3.8V, input pulse amplitude to meet phase detection discriminator MCH12140 meets ECL level demand, it is ensured that MCH12140 accurately compares the out of phase of two-way input pulse.The forward position of two input pulses R, V is only carried out phase demodulation by MCH12140, the phase discriminating pulse of output becomes DC voltage after active proportional integral filter, phase relation according to R, V end input pulse, active proportional integral filter output DC voltage be likely on the occasion of, being likely to as negative value, numerical value is at the maximum positive output voltage U of operational amplifierom+With maximum negative output voltage Uom-Between change.In the present embodiment, if the voltage of active proportional integral filter output be on the occasion of, the signal phase of the advanced input pulse 1 of signal phase of expression input pulse 2；Otherwise, if the voltage of active proportional integral filter output is negative value, represent the signal phase of the advanced input pulse 2 of signal phase of input pulse 1.Phase contrast between two input pulses of magnitude of voltage linear response of this active proportional integral filter output, after bipolarity A/D converter AD976A changes, is calculated by microcontroller STC12C5204AD and obtains phase difference value to be measured.
AD976A is 16 bipolarity A/D converters, and its output coded system is the complement of two's two's complement, and highest order is sign bit, and 0 represents positive voltage, and 1 represents negative voltage.STC12C5204AD judges the positive and negative value of voltage according to sign bit, is then calculated according to the result of data supplement.The reference voltage V of AD976AREFCan adopting+2.5V the reference voltage in sheet, it is also possible to external high stability voltage source, the analog voltage input range of this A/D converter is-4VREF～+4VREF。
The phase demodulation of MCH12140 exports after active proportional-integral filter, shown in its overall phase detection gain K such as formula (1):
U in formula (1)om+、Uom-It is the maximum positive voltage of the actual output of LT1028 and maximum negative voltage respectively.
For ensureing certainty of measurement, active proportional-integral filter circuit needs to return to zero.Inputting 1 end, input 2 ends and input two identical pulse signals of phase place respectively, the value regulating R4, R5 makes the LT1028 DC voltage exported be zero；When then measuring and record phase contrast respectively+2 π and-2 π of two input pulse signals to be measured, the U of the actual correspondence output of LT1028om+And Uom-Value, it is provided that to STC12C5204AD, is pressed formula (1) by STC12C5204AD and calculates phase detection gain K.
In the present embodiment, the reference voltage of bipolarity A/D converter AD976A selects the+2.5V reference voltage in sheet；Passing through programmed configurations so that it is input analog voltage can be surveyed and range for-5V～+5V, namely its full range voltage is 10V, and its minimum voltage resolution is 0.152mV, it is ensured that the certainty of measurement of phase contrast.
If the decimal number that the binary number of AD976A output obtains after STC12C5204AD complement arithmetic is D10, then the phase contrast radian number surveyed is shown in formula (2):
The pulse signal of two-way same frequency, is obtaining their phase contrastAfterwards, then record the cycle T of a wherein road signal, it is possible to by calculating, indirectly obtain the interval Δ t of the two pulse.In the present embodiment, by input pulse 2 through programmable frequency divider HMC394 divide, frequency be reduced to STC12C5204AD can scope measured directly, be input to the port Pn of STC12C5204AD.Set STC12C5204AD and be operated in intervalometer mode, within a cycle of Pn input pulse, the machine cycle is counted, it is possible to measure the cycle T ' of frequency divider output pulse.If measuring 10 times, average, then the precision of T ' is higher.Consider the frequency dividing ratio n of frequency divider, then calculate the cycle T obtaining input pulse to be measured.So, the interval of two input pulses to be measured can obtain according to formula (3).
The highest input signal frequency of high-speed programmable frequency-divider HMC394 is up to 2GHz, and its frequency dividing ratio is variable 2～32, preset by STC12C5204AD, and the height according to input pulse signal frequency can adjust at any time.Frequency dividing ratio n usually, is first put maximum number 32 by control strategy, and the pulse frequency to ensure STC12C5204AD port Pn can be surveyed；If it is known that the frequency inputting pulse to be measured is not high, then frequency dividing ratio can suitably set lower, to improve measuring speed.
Phase detection discriminator MCH12140 is ECL level device, and operating frequency is significantly high.Its discriminator sensitivity is also significantly high simultaneously.This circuit can be measured frequency and reach the ECL pulse of 500MHz or the interval of TTL pulse signal, and certainty of measurement is higher.
Claims (2)
1. based on the pulse interval measuring circuit of integrated phase detection discriminator, including two identical amplitude limiter circuits, integrated phase detection discriminator MCH12140, the active proportional-integral filter of Differential Input formula, A/D converter AD976A, programmable frequency divider, microcontroller STC12C5204AD and display, it is characterized in that: input pulse 1, after amplitude limiter circuit 1, is input to the input R of integrated phase detection discriminator MCH12140；Input pulse 2, after amplitude limiter circuit 2, is input to the input V of integrated phase detection discriminator MCH12140；The outfan of described integrated phase detection discriminator MCH12140It is connected respectively to two inputs of the active proportional-integral filter of Differential Input formula；The output signal of described active proportional-integral filter is input to the analog voltage input of A/D converter AD976A；The digital signal of described A/D converter AD976A output is input to microcontroller STC12C5204AD；The digital signal that A/D converter is changed by described microcontroller STC12C5204AD is calculated, and obtains the phase contrast of two input pulses；Input pulse Zhong mono-road is connected to the input of programmable frequency divider, the frequency dividing ratio of the preset programmable frequency divider of STC12C5204AD；The output of frequency divider is connected to the intervalometer of the rising edge of a pulse startup STC12C5204AD of port input Pn, a Pn of STC12C5204AD, and the next pulse rising edge of Pn makes the intervalometer of STC12C5204AD stop, recording timer data；Repeat 10 times to measure, STC12C5204AD calculate and take the meansigma methods measured 10 times, and obtain the cycle T of input pulse according to the frequency dividing ratio of preset programmable frequency divider；According to the phase contrast recorded and cycle T, STC12C5204AD calculate the interval obtaining two input pulse signals, and measurement result is delivered to display show.
2. the pulse interval measuring circuit based on integrated phase detection discriminator according to claim 1, it is characterised in that: the described active proportional-integral filter of Differential Input formula is made up of with peripheral resistance, capacity cell integrated operational amplifier LT1028.
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| CN201620233453.3U CN205405090U (en) | 2016-03-18 | 2016-03-18 | Pulse time interval measuring circuit based on integrated phase detection discriminator |
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| CN201620233453.3U CN205405090U (en) | 2016-03-18 | 2016-03-18 | Pulse time interval measuring circuit based on integrated phase detection discriminator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656122A (en) * | 2019-03-01 | 2019-04-19 | 山东交通学院 | High-precision pulse time interval measurement method and circuit based on phase detection discriminator and RMS conversion device |
| CN109765427A (en) * | 2019-03-01 | 2019-05-17 | 山东交通学院 | High-precision phase position difference measurements method and circuit based on phase detection discriminator and RMS conversion device |
| CN113466670A (en) * | 2021-09-03 | 2021-10-01 | 绅克半导体科技(苏州)有限公司 | Time delay measuring circuit, AC calibration device and IC measuring device |
-
2016
- 2016-03-18 CN CN201620233453.3U patent/CN205405090U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656122A (en) * | 2019-03-01 | 2019-04-19 | 山东交通学院 | High-precision pulse time interval measurement method and circuit based on phase detection discriminator and RMS conversion device |
| CN109765427A (en) * | 2019-03-01 | 2019-05-17 | 山东交通学院 | High-precision phase position difference measurements method and circuit based on phase detection discriminator and RMS conversion device |
| CN113466670A (en) * | 2021-09-03 | 2021-10-01 | 绅克半导体科技(苏州)有限公司 | Time delay measuring circuit, AC calibration device and IC measuring device |
| CN113466670B (en) * | 2021-09-03 | 2022-01-18 | 绅克半导体科技(苏州)有限公司 | Time delay measuring circuit, AC calibration device and IC measuring device |
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