CN107091956A - A kind of method and circuit for measuring network phase shift parameters - Google Patents
A kind of method and circuit for measuring network phase shift parameters Download PDFInfo
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- CN107091956A CN107091956A CN201710464003.4A CN201710464003A CN107091956A CN 107091956 A CN107091956 A CN 107091956A CN 201710464003 A CN201710464003 A CN 201710464003A CN 107091956 A CN107091956 A CN 107091956A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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Abstract
The invention belongs to electronic measuring technology field, and in particular to the method and circuit of a kind of measurement network phase shift parameters.The present invention using function signal generator export can setpoint frequency reference sinusoidal signal, the output signal of input reference signal and tested network is transformed to pulse signal respectively by two zero-crossing comparators, phase demodulation is carried out to two pulse signals by integrated phase detection discriminator again, under DSP controls and computing, the accurate phase shift parameters for obtaining tested network send to display.High speed phase discriminating technology and DSP rapid computations and processing are comprehensively utilized, the accurate measurement to being tested network phase shift parameters is realized.
Description
Technical field
The present invention relates to the network phase shift measurement technique of electronic measuring technology field, and in particular to one kind measurement network phase shift
The method and circuit of parameter.
Background technology
In fields such as communication, instrument and meters, in order to realize specific purpose, it is often necessary to using a circuit network to passing
Defeated signal carries out certain phase delay, this usual abbreviation phase shift of phase delay.And can the size of this phase shift accurate
Reach that setting value often influences whether the quality of communication or the precision of instrument, so accurately the number of phase-shift values of measurement network very must
Will.Influence sometimes for one network of assessment to signal transmission quality, it is also desirable to measure the phase that the network handles transmit signal
Shifting degree.
Traditional network phase shift parameters measuring method and means are a lot, have Network Analyzer mensuration, oscilloscope measurement method,
Voltage measurement method based on XOR gate etc., but all have the shortcomings that different.Network Analyzer measurement accuracy is high, but instrument is expensive；
It is relatively low that oscilloscope measurement method is limited measurement accuracy by human factor；Voltage measurement method circuit based on XOR gate is complicated, can survey
Frequency is low, and precision is not also high.
The content of the invention
In order to overcome the shortcoming of above-mentioned technical problem, the invention provides a kind of circuit it is simple, measure accurate network phase
Shifting parameter measuring method.
The method of the measurement network phase shift parameters of the present invention, it is particular in that, comprises the following steps：A. one is chosen
Integrated phase detection discriminator, if two pulse input end is respectively R, V, phase demodulation output end is U；B. a function signal hair is chosen
Raw device, the baseline sinusoidal wave signal of the setpoint frequency output it is divided into two-way, all the way by partiting dc capacitor C1It was connected to
The in-phase input end of zero comparator 1, another road is connected to the input of network under test, and the output of network under test is by stopping direct current electricity
Hold C2The in-phase input end of zero-crossing comparator 2 is connected to afterwards；C. by zero-crossing comparator 1 and the inverting input of zero-crossing comparator 2
All it is grounded；D. the output of zero-crossing comparator 1 is connected to the input R of integrated phase detection discriminator, the output of zero-crossing comparator 2 connects
It is connected to the input V of integrated phase detection discriminator；E. a digital signal processor DSP is chosen, for integrated phase detection discriminator
Output U phase discriminating pulse signal is calculated, and the phase shift parameters result of measuring and calculating is output into display shown.
The method of the measurement network phase shift parameters of the present invention, it is characterised in that：In the step b, function signal generator
The reference sinusoidal signal frequency of output can be changed according to condition of work.
The effect of zero-crossing comparator is shaping, and output before and after edge all very precipitous pulse signals are, it is necessary to using at a high speed
Device.The reference sinusoidal signal of function signal generator output phase after tested network can shift, and waveform may also
Change.By the output signal after partiting dc capacitor, the signal shaping is transformed to rectangle by high speed zero-crossing comparator 2
Pulse.Meanwhile, baseline sinusoidal wave is also transformed to by rectangular pulse using identical high speed zero-crossing comparator 1.So, benchmark
The phase relation between phase relation and the two rectangular pulses between sinusoidal signal and the signal of network under test output is complete
It is identical.Phase detection discriminator can distinguish advanced between two rectangular pulses with lagged relationship, and export a phase demodulation arteries and veins
Signal is rushed, this phase discriminating pulse signal accurately reflects the phase relation between two input rectangular pulses.Two partiting dc capacitors
Effect be eliminate tested network may caused by DC potential skew, so as to ensure that the pulse after waveform conversion accurately reflects ripple
Phase relation before fractal transform.
Correspondingly, in order to overcome the shortcoming of above-mentioned technical problem, the invention provides a kind of circuit is simple, measurement is accurate
Measure the circuit of network phase shift parameters.
The circuit of the measurement network phase shift parameters of the present invention, including function signal generator, two partiting dc capacitors, two
Zero-crossing comparator, integrated phase detection discriminator, DSP and display, it is characterised in that：Function signal generator output setpoint frequency
Baseline sinusoidal wave signal is divided into two-way, all the way by partiting dc capacitor C1The in-phase input end of zero-crossing comparator 1 is connected to, it is another
Road is connected to the input of network under test；Partiting dc capacitor C is passed through in the output of network under test2Zero-crossing comparator 2 is connected to afterwards
In-phase input end；The output of the zero-crossing comparator 1 is connected to the input R of integrated phase detection discriminator, zero-crossing comparator 2 it is defeated
Go out to be connected to the input V of integrated phase detection discriminator；The inverting input of the zero-crossing comparator 1 and zero-crossing comparator 2 all connects
Ground；The output end U of the integrated phase detection discriminator is connected to a DSP GPIO pin；Input pulses of the DSP to GPIO
Measure and calculate, the phase shift parameters that calculating is obtained are sent to display and shown.
DSP measures the phase discriminating pulse of GPIO inputs using timer, rises on the incoming pulses along then, timer is beaten
Open；Pulse falling edge followed by then reads and preserve the value t of timer1；Come in next pulse rising edge
When Off Timer, read and preserve the value t of timer2, the t2Value is exactly the cycle of input pulse.The then phase shift of network under test
Radian number is shown in formula (1)：
To ensure measurement accuracy, measurement process can be carried out n times, and final result takes the average value of n measurement.
The beneficial effects of the invention are as follows：By means of function signal generator can setpoint frequency reference sinusoidal signal, utilize
The phase demodulation effect of the shaping of high-speed comparator and integrated phase detection discriminator, under DSP controls and computing, obtains the standard of tested network
True phase shift parameters, circuit is simple, measurement is accurate, and operating frequency range is wide, while extending the application neck of integrated phase detection discriminator
Domain.
Brief description of the drawings
Fig. 1 is theory diagram of the invention；Fig. 2 is the partial circuit diagram of the present invention, C containing partiting dc capacitor1, stopping direct current electricity
Hold C2, two zero-crossing comparator, phase detection discriminator MC12040；Accompanying drawing 3 is phase detection discriminator working waveform figure of the invention.
In Fig. 2：The zero-crossing comparator 2 of 1 zero-crossing comparator 1,2.
Embodiment
With reference to accompanying drawing, the method for measuring network phase shift parameters of the invention is followed the steps below：
A. an integrated phase detection discriminator MC12040 is chosen, two pulse input end is respectively R, V, phase demodulation output end
For U.
B. a function signal generator is chosen, the baseline sinusoidal wave signal of the setpoint frequency output it is divided into two-way,
Pass through partiting dc capacitor C all the way1The in-phase input end of the zero-crossing comparator 1 of ADPCM600 compositions is connected to, another road is connected to
Partiting dc capacitor C is passed through in the input of network under test, the output of network under test2The Zero-cross comparator of ADPCM600 compositions is connected to afterwards
The in-phase input end of device 2.
C. two zero-crossing comparator ADPCM600 inverting input is all grounded.
D. the output of zero-crossing comparator 1 is connected to the input R of integrated phase detection discriminator, the output of zero-crossing comparator 2
It is connected to the input V. of integrated phase detection discriminator
E. a digital signal processor TMS320F2811 is chosen, for exporting U to integrated phase detection discriminator MC12040
Phase discriminating pulse signal calculated, and the phase shift parameters result of calculating be output to display shown.
As shown in drawings, the circuit of the measurement network phase shift parameters of the present invention is given, it includes partiting dc capacitor C1, every
DC capacitor C2, it is zero-crossing comparator 1 (1), zero-crossing comparator 2 (2), phase detection discriminator MC12040, DSP TMS320F2811, aobvious
Show device and necessary+5V working powers.
Two high-speed comparator circuit structures are identical, and ADCMP600 end of oppisite phase is grounded, and constitute homophase input formula
Zero-crossing comparator form.ADCMP600 output, directly can be connected with phase detection discriminator MC12040 inputs.
According to the working frequency of tested network set function signal generator output reference sinusoidal signal frequency, and by its
It is divided into two-way, all the way by partiting dc capacitor C1Square wave is transformed to by zero-crossing comparator 1 afterwards；Another road after tested network,
Pass through partiting dc capacitor C again2Output is transformed into square wave output to zero-crossing comparator 2.Two-way pulse after shaping is converted
Signal is separately input to integrated phase detection discriminator MC12040 two inputs R, V.MC12040 is only to two input pulses
Forward position carries out phase demodulation, the phase between the two not transformed waveforms of phase discriminating pulse energy accurate response exported from MC12040 U ends
Position relation, work wave is as shown in Figure 3.
The GPIO that the phase discriminating pulse of MC12040 U pin output is connected to digital signal processor TMS320F2811 any draws
The GPIO pin that U ends with MC12040 are connected is configured to input pin by pin, TMS320F2811, is completed using timer function
Measuring and calculating to inputting phase discriminating pulse.When the GPIO phase discriminating pulse rising edges inputted then, timer is opened；Followed by
Pulse falling edge then to read and store the value t of timer1；Carry out then Off Timer in next rising edge, read
And store the value t of timer2.The course of work is as shown in Figure 3.Then the phase shift radian number of network under test is shown in formula (1).For
Ensure measurement accuracy, measurement process can be carried out n times, and final result takes the average value of n times.So, network is tested in work frequency
Phase shift parameters under rate are just determined accurately, and measurement result is intuitively shown by display.
For improve circuit can working frequency, DSP selects TMS320F2811, the highest master of TMS320F281x series DSPs
Frequency is 150MHz, so, and the upper operational frequency limit of whole measuring circuit is dependent on phase detection discriminator MC12040 work frequency
Rate, reaches as high as 80MHz.And comparator ADCMP600 is CMOS/TTL compatible devices, working frequency is very high, and offset voltage is only
3mV, the influence to measurement accuracy is very little.
In the present embodiment, the frequency of function signal generator output reference sine wave can be according to the real work of tested network
Frequency is set, and highest frequency can be set to 80MHz.Change the output sine wave freuqency value of function signal generator, it is possible to
Measure phase shift parameters value of the tested network under different operating frequency.
The measuring circuit of the present invention, the reference sinusoidal signal for the setpoint frequency sent out using function signal generator, by height
Fast comparator carries out shaping respectively to reference signal and the output signal of tested network, and the two paths of signals after shaping is again by integrated mirror
Phase frequency discriminator is than phase, under DSP controls and computing, and the phase shift for obtaining accurately tested network is mutually exported from the ratio of phase detection discriminator
Parameter.Circuit is simple, measurement is accurate, operating frequency range is wide, also extends the application field of integrated phase detection discriminator.
Claims (3)
1. a kind of method for measuring network phase shift parameters, it is particular in that, comprises the following steps：A. an integrated mirror is chosen
Phase frequency discriminator, if two pulse input end is respectively R, V, phase demodulation output end is U；B. a function signal generator is chosen,
The baseline sinusoidal wave signal of the setpoint frequency output it is divided into two-way, all the way by partiting dc capacitor C1It is connected to Zero-cross comparator
The in-phase input end of device 1, another road is connected to the input of network under test, and partiting dc capacitor C is passed through in the output of network under test2Afterwards
It is connected to the in-phase input end of zero-crossing comparator 2；C. the inverting input of zero-crossing comparator 1 and zero-crossing comparator 2 is all grounded；
D. the output of zero-crossing comparator 1 is connected to the input R of integrated phase detection discriminator, the output of zero-crossing comparator 2 is connected to collection
Into the input V of phase detection discriminator；E. a digital signal processor DSP is chosen, for exporting U's to integrated phase detection discriminator
Phase discriminating pulse signal is calculated, and the phase shift parameters result of measuring and calculating is output into display shown.
2. the method for measurement network phase shift parameters according to claim 1, it is characterised in that：In the step b, function letter
The reference sinusoidal signal frequency of number generator output can be changed according to condition of work.
3. the circuit of network phase shift parameters is measured, including function signal generator, two partiting dc capacitors, two Zero-cross comparators
Device, integrated phase detection discriminator, DSP and display, it is characterised in that：Function signal generator exports the reference sinusoidal of setpoint frequency
Ripple signal is divided into two-way, all the way by partiting dc capacitor C1The in-phase input end of zero-crossing comparator 1 is connected to, another road is connected to
The input of network under test；Partiting dc capacitor C is passed through in the output of network under test2The homophase input of zero-crossing comparator 2 is connected to afterwards
End；The output of the zero-crossing comparator 1 is connected to the input R of integrated phase detection discriminator, and the output of zero-crossing comparator 2 is connected to
The input V of integrated phase detection discriminator；The inverting input of the zero-crossing comparator 1 and zero-crossing comparator 2 is all grounded；The collection
Output end U into phase detection discriminator is connected to a DSP GPIO pin；The DSP is measured to GPIO input pulse
With calculating, the phase shift parameters that calculating is obtained are sent to display and shown.
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| CN201710464003.4A CN107091956A (en) | 2017-06-19 | 2017-06-19 | A kind of method and circuit for measuring network phase shift parameters |
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| CN201710464003.4A CN107091956A (en) | 2017-06-19 | 2017-06-19 | A kind of method and circuit for measuring network phase shift parameters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100928A (en) * | 2018-09-05 | 2018-12-28 | 山东交通学院 | A kind of high-precision pulse time interval measurement method and circuit |
| CN109116111A (en) * | 2018-09-05 | 2019-01-01 | 山东交通学院 | A kind of high-precision phase position difference measurements method and circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808056A (en) * | 2015-04-19 | 2015-07-29 | 华南理工大学 | Frequency characteristic testing method and device based on comparator conversion |
| CN207081775U (en) * | 2017-06-19 | 2018-03-09 | 山东交通学院 | A kind of circuit for measuring network phase shift parameters |
-
2017
- 2017-06-19 CN CN201710464003.4A patent/CN107091956A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808056A (en) * | 2015-04-19 | 2015-07-29 | 华南理工大学 | Frequency characteristic testing method and device based on comparator conversion |
| CN207081775U (en) * | 2017-06-19 | 2018-03-09 | 山东交通学院 | A kind of circuit for measuring network phase shift parameters |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100928A (en) * | 2018-09-05 | 2018-12-28 | 山东交通学院 | A kind of high-precision pulse time interval measurement method and circuit |
| CN109116111A (en) * | 2018-09-05 | 2019-01-01 | 山东交通学院 | A kind of high-precision phase position difference measurements method and circuit |
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Application publication date: 20170825 |