SU1202012A1 - Generator based on surface acoustic wave delay line - Google Patents

Abstract

A GENERATOR ON A DELAY LINE ON SURFACE ACOUSTIC WAVES, containing a piezoelectric sound conduit, on which the first and second input-pin converters, the first and second output pin-converters, connected in series with the first adjustable phase shifter and the first successively connected, are connected. an amplifier, a serially connected mixer and a band-pass filter, with the first input interdigital transducer The detector is connected between the input of the first adjustable phase shifter and the common bus, the first output counter-pin converter is connected between the output of the first amplifier and the common bus, the second output counter-pin converter is connected between the input of the second adjustable phase shifter and the common bus, the second output counter-pin, the converter is turned on between the output of the second amplifier and the common bus, and the outputs of the first and second amplifiers are connected to the corresponding inputs of the mixer, characterized in that, in order to To improve frequency stability by extending the temperature range of thermal compensation, the parameters S, and 02 are interconnected by a mathematical expression — 27.C, .io.uT-V -; 1-LC) o. (I where is the delay time of the propagation of the surface acoustic wave between the first input interdigital transducer and the first output interdigital transducer; the delay time of propagation -2 of the surface acoustic wave between the second input interdigital transducer and the second output Counter-dummy converter output frequency fluctuations J i - temperature coefficient of delay of the surface acoustic wave LT - temperature increment i & Cf - phase incursion in the reverse connection.

Description

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The invention relates to radio engineering, in particular, to stable reference generators, and can be used in stand-alone time stores.

The aim of the invention is to increase the frequency stability by extending the temperature range of thermal compensation.

The drawing shows a structural electrical circuit of the proposed generator on the delay line on surface acoustic waves. The generator on the delay line on the surface acoustic waves (SAW) contains a piezoelectric acoustic line 1, the first input interdigitator transducer (IDT 2, the first output IDT 3, the second input IDT 4, the second output IDT 5, the first amplifier 6, the first adjustable phase shifter 7, the second amplifier 8, the second adjustable phase shifter 9, the mixer 10, the band-pass filter 11.

The generator on the delay line on the surfactant works as follows.

The first input IDT 2, the first output IDT 3, the first amplifier 6, the first adjustable phase shifter 7 form the first generator, generating at frequency f | .

The second input IDT 4, the second output IDT 5, the second amplifier 8, the adjustable phase shifter 7 form a second generator that generates at frequency i. . Oscillations with frequencies i, and ig are mixed in mixer 10, the output of which produces, in particular, an oscillation with a frequency ip equal to the difference of frequencies i and 1. Band-pass filter II, tuned to frequency i, delays other combination frequencies, and thus the output oscillation is oscillation with frequency l. Thermal compensation of instabilities

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the output oscillation frequency is achieved by arranging all the IDTs, selecting the distance separating the first input IDT 2 and the first output IDT 3, as well as selecting the distance between the second input IDT 4 and the second output IDT 5. Phase generation in the first and second feedback chains The second generator will be the same with the identity of the first and second amplifiers 6.8, as well as the first and second adjustable phase shifters 7.9. Directions for the distribution of surfactants should be such that

15 temperature coefficients of the SAW delay (y between the first input IDT 2 and the first output IDT 3, as well as between the second input ISCH 4 and the second output IDT 5, were linear,

20 non-zero, temperature independent and equal. In this case, the frequency of the output oscillations f, the temperature coefficient of the delay of the SAW U,. temperature increment T,

25, the phase advance in the feedback circuits btf and the delay time of the SAW propagation between the first input IDT and the first output IDT are given values.

30 The distance between the first input: IDT 2 and the first output IDT 3, as well as the distance between the second input IDT 4 and the second output IDT 5 determine the path lengths of the surface acoustic waves and, accordingly, the delay time of the SAW propagation between the first input IDT 2 and the first output of the LSI 3 b and the delay time dd SAW propagation between the second input IDT 4 and the second output IDT 5 ".

The generator parameters on the delay line on the SAW should be interconnected by a mathematical expression.

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Claims (1)

GENERATOR ON A SURFACE ACOUSTIC WAVE DELAY LINE, containing a piezoelectric sound conduit on which the first and second input interdigital transducers are located, the first and second output interdigital transducers, connected in series to the first adjustable phase shifter and the first amplifier, connected in series an adjustable phase shifter and a second amplifier, a series-connected mixer and a bandpass filter, while the first input interdigital converter is connected between the input of the first adjustable phase shifter and the common bus, the first output interdigital converter is connected between the output of the first amplifier and the common bus, the second output interdigital converter is connected between the input of the second adjustable phase shifter and the common bus, the second output interdigital, converter is connected between the output of the second amplifier and the common bus, and the outputs of the first and second amplifiers are connected to the corresponding inputs of the mixer, characterized in that, in order to increase the bility by increasing the frequency for the temperature range temperature compensation, the parameters £, and ^ interrelated mathematical expression Н · £ _Ο · ΛΤ · \ х-ч s 1 “. 5 where is the propagation delay time of the surface acoustic wave between the first input interdigital transducer and the first output interdigital transducer; ' 1-2 - the delay spread neniya _h between the surface acoustic wave, a second input interdigital transducer and the second output interdigital transducer ', io ~ oscillation frequency output; y is the temperature delay coefficient of the surface acoustic wave) AF is the temperature increment) - phase incursion in feedback circuits. I 202 ()