SU1402958A1 - Analyzer of phase fluctuations of generators - Google Patents

Abstract

This invention relates to a radio measuring technique. The analyzer contains a mixer 2, a delay line 3, a high-pass filter 4, a phase detector 6 and an indicator 10. The introduction of a quad 5, a frequency-voltage converter 7, an attenuator 8, a subtraction unit 9 and the formation of new functional connections provide high accuracy (i3% ) analysis ctor. Phase fluctuations of the spectrum of the oscillating frequency generator 1 under study, when its frequency is tuned within Is 10. 1 Il.

Description

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 The invention relates to a radio measuring technique and can be used to measure phase fluctuations of generators, including electronically tunable.

The aim of the invention is to improve the measurement accuracy,

The drawing shows a structural diagram of the generator phase fluctuation analyzer.

The generator of phase oscillations of gen eors contains the oscillating frequency oscillator (GCF) 1, mixer 2, delay line 3, filter | 4 high frequencies (HPF), quad 5, phase detector 6, frequency converter 7 - voltage, attenuator 8, the subtraction unit 9, the indicator 10, the second input of the mixer 2, the inputs of LINE-3 delay, quadrant 5 and frequency converter 7 - voltage are interconnected and are the input of the generator phase fluctuation analyzer, which is connected to the output of the test jack 1, sync cat output The first is connected to the same input of the indicator 10, and the output of the delay line 3 is connected to the first input of the mixer 2, the output of which through the HPF 4 is connected to the first input of the phase detector 6, the output (of the quad 5 is connected to the second input of the phase detector 6, the output of which is connected to the second input of the jfca 9 subtraction, the first input of which through a attenuator 8 is connected to the output of the frequency converter 7 is the voltage, and the output of the subtraction unit 9 is connected to the measuring input of the indicator 0.

The phase fluctuation analyzer operates as follows.

The signal C (t) from the output of the investigated GKC 1

U (t) U,) (t) - t + C1 (t)

at the same time, it goes to the second input of the mixer 2 directly and to its first input through the delay line 3. The same signal is applied to the inputs of the quadrant 5 and the frequency converter 7 - voltage.

The signal allocated by the highpass filter 4, turned on at the output of the mixer 2, can be recorded as

U (t) By whom i w (t) X

X t + w (t) lo. + L 4 (t + L) + a (t) b

where Kj is the transfer coefficient of the mixer 2;

cj (t) is the frequency of the studied GCF 1; At the output of Quadrator 5, a variable component is extracted

u, (t)

(t) -t + 2iXt) j.

where Ka is the transfer coefficient of the quad 5,

Since the signals U (t) and UjCt) at any time are quadrature, then, bringing them to the linear phase detector 6, at its output we get

Ujt) Kjjj (j (t) ((() - 4 (t)) j,

where Kjj is the transmission coefficient of the phase detector 6. The signal U (t) consists of two components: a harmonic component u (t) f, varying according to the law of change of the frequency of the studied GCH, and component t / (t + C, ) -t ((t) - phase fluctuations of the studied GCh. To compensate the harmonic component u) (t) 2i with frequency converter 7 - voltage is formed an additional signal

U7 (t) Cr, .u) (t) - and „p.

where is k. - Transmitter 7 frequency transfer coefficient - voltage;

UOH is the reference voltage of the frequency – voltage converter.

The signal Uj (t) is directly, and U-j (t) through the wide field of the phase-shift attenuator 8 is fed to. the inputs of block 9 of the subtraction (differential amplifier), and the signal at its output can be written as

U9 (t) K5, (lj-U,) - K ,, (KID X

X f.uJtt) + KIB t | (t + t) - t / U) - K p ,. K r Uon b) (t),

where K - block transfer coefficient

9 subtraction

The signal U9 (t) when the condition

KGV Y K p K s (t m Uon is directly proportional to the magnitude of the phase fluctuations of the studied GCF:

B 4029

uj (t) - k ,, K (t + -g) - (t).

58

when rebuilding its frequency lah 1:10.

in the past

The above condition is easily fulfilled by varying the attenuator coefficient 8 by the minimum residual harmonic component of the sweep frequency of the studied GCU observed on the panoramic display screen 10 or by the minimum readings of the selective voltmeter connected in parallel with the measuring input of the panoramic display 10.

The essence of the work of the proposed phase fluctuation spectrum dialyzer is to automatically maintain a constant sensitivity when the frequency of the studied GCCH changes. The Phase fluctuation analyzer provides high accuracy (± 3%) of the analysis of the components of the phase fluctuation spectrum of the GCCH under study.

Claims (1)

Claims An oscillator phase fluctuation analyzer comprising a series-connected delay line, a mixer, a high-pass filter and a phase detector, an indicator, wherein the input of the delay line and the second mixer input are connected to the analyzer's input, characterized in that A quadrant and series-connected frequency converter - voltage, attenuator, subtraction unit, the second input of the phase detector is connected to the quadr output, the second input of the subtraction unit connected to the output of the phase detector and an output connected to the measurement input indicator.