SU1191841A1 - Method of controlling frequency of parametric amplifier pump - Google Patents

Abstract

METHOD FOR CONTROL FREQUENCY GENERATOR PUMPING PARAMETRIC AMPLIFIER, comprising determining the pumping oscillator frequency the product of the input test signal frequency by a factor of the pump frequency of multiplicity and frequency of the measuring signal input measured at the coincidence of the output amplifier combination was to Tsey the signal tunable in frequency, characterized in that In order to increase accuracy, the input signal power is set equal to the saturation level of the parametric amplifier. S

Description

sK

00 4; ib

iga

j

Fig. 1) is not related to radio measuring equipment and can be used in tuning and operating parametric amplifiers to control the frequency of the pump generators.

The purpose of the invention is to increase the accuracy by increasing the signal power at the input of the parametric litter to the saturation level, which makes it possible to indicate the coincidence of the pump generator frequency and the signal harmonic.

Figure 1 shows a block diagram of an apparatus for carrying out the method; on figa - e - the time diagrams, which explain his work, where

a is the process of tuning the measuring signal source in the passband (.aip-i;) of a parametric amplifier;

B is the waveform of the output of the parametric amplifier S (i} and on the screen of the oscilloscope 5 (-tj for the case when the combination component w does not fall into the passband of the parametric amplifier, i.e. WK LWj., UJo;

B-form signals Sj (t) and 5 (, t) for the case when the combination component falls into the passband of the parametric amplifier, i.e. l) Ys Y;

g - waveform 55i.i) i) for the case when the frequency of the combinational component approaches the frequency of the measuring signal -

The d-form of the signals Sj (t) and Sj (-tl for the case when the combining component is equal to the frequency of the measuring signal u). to 4 e-waveform Sj (i) and S (t) for the case when the combination component is in the passband of the parametric amplifier, but also)) 4 Sc-7i) i) 5

The device of FIG. 1 for controlling the frequency of the pump oscillator of a parametric amplifier contains the source 1 of the measuring signal, consisting of the generator 2, the attenuator 3 and the frequency meter 4, the parametric amplifier 5 with the pump generator, the amplitude detector 6 and the oscillograph 7.

18412

The frequency control of the parametric amplifier oscillator is carried out as follows.

The input of the parametric amplifier 5 is fed from the generator 2 by the measuring signal and its amplitude is increased by the attenuator 3 to a value that exceeds the dynamic range of the input signals of the parametric amplifier 5.

The frequency of the oscillator 2 is tuned within the passband of the parametric amplifier 5 from 5 Bc, u)) g (time points TO - 14 (Fig. 021).

When the combination component u has not yet fallen into the strip.

0 transmission of the parametric amplifier 5 (time T, the input of the amplitude detector 6 from the output of the parametric amplifier 5 receives only the measurement signal with frequency tOc ui, which is detected by the amplitude detector 6 and displayed on the oscilloscope 7 as the constant component of Fig. 3.

When the combination component of the generator 2 tuning process falls (along with Yurga) into the passband of the parametric amplifier 5 (time T), two components are sent to the detector 6) and w, the difference of which is indicated on the oscilloscope screen (Fig. 2 cJ). With further frequency tuning of generator 2, the difference frequency (.) Decreases, and at time Tj becomes approximately zero, and at time T - Wx u) g (jJ, i.e., 5 left beats appear, which are displayed on the oscilloscope screen (Fig .21 and (J). At time Tj, fix the frequency of the generator 2 using the frequency generator 4. The frequency of the pump

Q is defined as

Ы „rtU) j, nu) j,

where Wj, is the frequency of the measuring signal, the signal at the time of coincidence of 5 frequencies and) „and;

ti is the known multiplicity factor of the pump frequency and signal frequency.

..11918414

With further rearrangement, the frequency also increases on the screen of the oscillographs of the measuring signal (time Tj), the phase 7 indicates the difference frequency to the difference frequency (ujg-w) again in the form of harmonic oscillations of FIG.

HP

S 55

Shk sho

t

  U) aU) H-ii} i 7g

)

t

12) i ff. ) -uJ ". t

Claims (1)

METHOD FOR CONTROL THE FREQUENCY OF THE PUMP GENERATOR OF THE PARAMETRIC AMPLIFIER, which consists in determining the frequency of the pump generator as the product of the frequency of the input measuring signal and the frequency coefficient of the pump frequency and the frequency of the input measuring signal measured when the amplifier output matches the combination component with a frequency-tunable signal that differs in frequency with a signal that differs in frequency with a signal , in order to improve accuracy, the input signal power is set equal to the saturation level of the parametric amplifier. · о (rig! ] 1191841 2