SU741185A1 - Relative phase shift analyzer - Google Patents

Description

The invention relates to a measurement technique and can be used in the measurement of the statistical characteristics of the fluctuations of the phase of signals. A relative phase shift analyzer is used, used to measure the statistical characteristics of an irregular phase difference / that contains a generator, a delay line, a phase detector and an indicator 1. The disadvantage of this device is a small measurement accuracy. Also known is an analyzer of relative phase shifts, containing two identical delay lines connected in series and executed in the form of a shift register with two N times-9 | from each other outputs, two-way switches connected to the outputs of the shift register, two-stroke driver, frequency mixer, and comparator unit 2. The disadvantage of the device is low measurement accuracy. The purpose of the invention is to improve the measurement accuracy. This goal is achieved in that the relative phase shift analyzer containing the shift register, the first and second control inputs of each cell of which are connected to the first and second outputs of the push-pull generator, respectively, and through the first and second dual switches are connected respectively, one generator with the input of the comparison unit and the mixer, the output of which is connected to the second input of the comparison unit, and the second input of the mixer is connected to the information input of the shift register; uchaynyh numbers and the generators reference digital phase shifter, the control input e ate soedinenys digital phase shifter outputs the random number generator, and the high-frequency input and output of the phase shifter are connected respectively to the output of the reference oscillator and input a push-pull shaper. FIG. 1 shows the structural scheme of the analyzer of relative phase shifts; in FIG. 2 - time diagrams for the device operation. The relative phase shift analyzer contains random number generator 1, reference generator 2, digital phase shifter 3, push-pull driver 4, shift register 5, frequency mixer 6, comparison unit 7, first and second dual switches 8 and 9,

The analyzer works as follows.

The push-pull shift register 5 forms a reference oscillation (pulses 2 - in Fig. 2) by delaying the signal (pulses O / in Fig. 2) arriving at the input. FIG. 2 them. Pulses ff, B emit the operation of the push-pull driver 4. Moreover, the cd pulses cf are removed from the first output of the driver 4 and are fed to the first control inputs of the cells forming the shift register 5. The pulses of pulses are removed from the second output of the imaging device 4 and are fed to the second control inputs of the cells. The pulses (f, -6 are formed from the output signal of the phase shifter 3, have a frequency of 2f and a uniform distribution law of their appearance on the time axis. The pulses O are formed of the signal at the input, and have a frequency of fJ. Thus each pulse O is quantized in time 2 times (m 2fQ, fc 2) by signals with a strictly defined equutler phase distribution law. eny

1,) (o-go) H (g; 7,

i.e., the error of SPoCt) can be reduced to zero due to improved shift register operation. Here, H (C) is the fault of the shift register during operation, with clock pulses, in which the law of phase distribution differs from uniform to the right.

Through switch 8, signal 2 delayed by time NT enters comparison block 7, and the signal from switch 9 delayed by time 2NCJ is fed to one of the inputs of the mixer 6 frequencies. The last signal together with the measured one is transformed in the mixer b of frequencies, as a result of which the combination product with the frequency equal to the sum of the frequencies and fluctuations of the phases of the converted signals is extracted. This amount to the signal center also goes to block 7 of the comparison. The voltages supplied to the comparison unit 7 are equalized in it by frequency, and then by phase comparison, after which the output of the comparison unit 7 is a measurement result proportional to the difference in phase fluctuations

h Ct-NC) -4W} - 4 (t-2 NC) -4lt-Nt: l - yi3 :)

taking place within time intervals of 2NGGyYS,

where 4 (t) is the phase fluctuation of the analyzer input signal;

4 () - phase fluctuations delayed by the time NT;

l | (t-2KG) - phase fluctuations delayed by time 2YG; Yofc previously marked by

sinfulness introduced

shift register with the total number of cells 2N.

Thus, the creation of a uniform law of phase distribution of the 5LOV signals arriving at the control inputs of the register allows decreasing the error C0 (C) down to zero and thereby increasing the accuracy of measuring relative phase shifts.

0. The use of new elements - a number generator, a reference generator and a digital phase shifter, distinguishes the analyzer relative sdvn-gov from known, since to zero

5, the error due to the operation of the shift register is reduced. As a result, the accuracy of measurement of the fluctuations of the phase of the signals is increased and the field of application of the relative phase shift analyzer is expanded.

Claims (2)

Invention Formula Relative phase analyzer 5 shifts, containing the shift register, the first and second control inputs of each cell of which are connected respectively to the first and second outputs of the push-pull transmitter, and 0 N and 2N outputs of it through the first and second switches 2 are connected respectively to one of the inputs of the comparison unit and the mixer, the output of which is connected to the second input The comparator unit and the second input of the mixer are connected to the information input of the shift register, characterized in that it is equipped with a random number generator, a reference generator and a digital phase shifter to increase measurement accuracy, and the controlled inputs of the digital phase shifter are connected to the outputs of the random number generator , and the high-frequency inputs and output of the rotator phaeo5 are connected respectively to the output of the reference generator and the input of the push-pull driver. Sources of information taken into account in the examination Q 1. Bershtein I., L. Fluctuations of the amplitude and phase of a lamp generator,. Produce the USSR Academy of Sciences, series of physical, 1950, Vol. 14, 2, p. 145. 2. USSR author's certificate 436295, cl. G 01 R 25/00, 1973. Fig. / 6 2 , 2