SU1559307A1 - Radio signal sample converter - Google Patents

Abstract

The invention relates to a radio measuring technique and can be used in two-channel radio-pulse meters measuring the phase difference of microwave signals. The aim of the invention is to expand the frequency range of the input signals of the converter. This goal is achieved by including mixers 1-4, filters 5-7, LO 8 and 9, amplitude detector 10, threshold device 11, trigger 12, DC amplifier 13, intermediate frequency amplifiers 14 and 15, and a block in the converter circuit. 16 phase locked loop. Elements 7, 10, 11, 12, and 13 provide adjustment of the cleanliness of the local oscillator 8, and elements 15, 16 adjust the frequency of the local oscillator 9. The converter allows the frequency range of the input signals to be doubled. 1 il.

Description

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The invention relates to a radio measuring technique and can be used in two-channel radio-pulse meters measuring the phase difference of microwave signals.

The purpose of the invention is to expand the frequency range of the input signals of the converter.

The drawing shows a block diagram of the converter.

The converter contains mixers 1 - C, filters 5-7-heterodyne 8 and E, detector 10 amplitude, ele

Ment 11, threshold trigger 12, amplification 15 and the output voltage of the local oscillator 9 constant current amplifier 13, amplifiers k and 15 of the intermediate frequency sin (flt-if), (5) block 16 of the phase-locked loop, where iep) is the output amplitude eg The first inputs of mixers 1 and 3 in the local oscillator 9;

These are the converter inputs. You-Yagi h74 frequency and initial phase

the course of the mixer 1 through the filter 5 is connected to the first input of the mixer, the output of which is connected to the input of the amplifier And and through a series of 25 connected filter 7, the detector 10,

the output voltage of the local oscillator 9. Filter 6 isolates the voltage

element 11, trigger 12, amplifier 13 to the input of the local oscillator 8, the output of which is connected to the second input of the mixer 1 and the first input of the mixer 2. The output of the mixer 2 through the serially connected amplifier 15 and the block 16 is connected to the input of the local oscillator 9, the output of which is connected to the second inputs mixers 2 and 3. The output of the mixer 3 through the filter 6 is connected to the second input of the mixer 4. The outputs of the converter are the outputs of the amplifiers 1 and 15.

 jmsin (u) e-5l) t-if,

(6)

thirty

35

where U6h1 is the amplitude of the output voltage of the filter 6.

The frequency of the local oscillator 9 is selected less than the frequency of the local oscillator 8. The output voltages of the filters 5 and 6 are fed to the inputs of the mixer C, the output voltage of which

 Sin (fl, -tft) - Chr, (7)

where U4m is the amplitude of the output voltage of the mixer. The voltage is isolated and amplified. The converter operates as follows 4Ј) with an I4 amplifier, in one of the following ways. The output voltages of the converter.

To form the second output voltage of the converter, the signals of the local oscillators 8 and 9 are fed to the inputs 45 of the mixer 2, the output voltage of which

One of the input voltages is supplied to the inputs of the mixer 1.

. sin (uЈ + q), (1)

where UCT is the amplitude of the measured signal; h1 - phase shift of the input sigU, -OtmsinC (fl-fl1l) t + (4 f-4 l), (8

Filter 5 selects voltage

Vu msinC wc-fl, (h;

where Ugm is the amplitude of the output voltage of the filter 5.

A reference voltage is applied to the inputs of the mixer 3.

where u

from

- amplitude neither

the output voltage of the local oscillator 9. Filter 6 isolates the voltage

 jmsin (u) e-5l) t-if,

(6)

where U6h1 is the amplitude of the output voltage of the filter 6.

The frequency of the local oscillator 9 is selected less than the frequency of the local oscillator 8. The output voltages of the filters 5 and 6 are fed to the inputs of the mixer C, the output voltage of which

 Sin (fl, -tft) - Chr, (7)

U, -OtmsinC (fl-fl1l) t + (4 f-4 l), (8

converter voltage, and the local oscillator output voltage 8

 ,)

(2)

50 where Ulm is the amplitude of the output voltage of the mixer 2. The voltage is isolated and amplified by the amplifier 15. As can be seen from expressions (7) and (8), the output voltages where and & t the amplitude of the output voltage - $$ converter are shifted relative to the local oscillator 8 ; w each other by the angle i, is represented by and and is the frequency and the initial phase of the phase difference of the input signal output voltage of the wires, and have a fixed frequency of 8,. (I, -L2).

At the input of the mixer, there are simultaneously the signals of a combinational frequency converter 2 Ya.Ј wc (2 $ 7, - (l) s) and a useful frequency converter SLS-I (yy-I,). As the frequency of the input signals of the converter approaches the value of a), 5 1.5 I.)) the difference in the frequencies of the signals of the Raman and the useful transformations decreases. The beat-out signal of the 3-f 2s (2-2) c) falls into the passband of filter 7, whose tuning frequency is chosen higher than the tuning frequency of the intermediate-frequency amplifiers 14 and 15. The voltage at the output of the filter 7 is detected by the detector 10 and is fed to the input of the element 11. When this voltage exceeds the value of U then the control voltage appears at the output of the element 11, under the influence of which the trigger 12 changes its state to the opposite. The output voltage of the trigger 12 through the amplifier 13 controls the frequency of the local oscillator 8. In the presence of the output of the trigger 12, the voltage of the logical 1 the local oscillator 8, and together with it using the block 16 and the frequency of the local oscillator 9, is reduced to avoid frequencies of useful and combination transformations at the output of the mixer 3 (mixer 1). If there is a trigger voltage 12 at the output of the logic O, the frequencies of the local oscillators 8 and 9 return to their original values.

Since, the beat signal caused by the Raman and the useful transformations in the reference channel of the converter enters the passband of the filter 7. Therefore, the amplitude of this signal and, therefore, the response level of element 11 and pores are determined only by the elements of the converter circuit and do not depend on the amplitude of the measured signal UCT at the signal input of the converter.

The advantage of the frequency converter of the radio pulse signals is1559307

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five

The possibility of expanding the frequency range of the input signals by two times.

invention formula

The frequency converter of the radio pulse signals containing the first, second, third and fourth mixers, the first, second and third filters, the first and second local oscillators, the converter inputs being the first inputs of the first and third mixers, the output of the first mixer

5 through the first filter is connected to the first input of the fourth mixer, the output of which is connected to the input of the third filter, the output of the third mixer through the second filter is connected to the second input of the fourth mixer, the output of the first local oscillator is connected to the first, and the output of the second heterodyne to the second input of the second mixer, characterized in that, in order to expand the operating frequency range of the input signals, the first and second intermediate frequency amplifiers, an amplitude detector, are additionally introduced into it,

0 threshold element, trigger, DC amplifier, phase locked loop, the output of the third filter through a series-connected amplitude detector,

5 the threshold element, the trigger and the DC amplifier is connected to the input of the first local oscillator, the output of which is additionally connected to the second input of the first mixer, the output

0 of the fourth mixer is additionally connected to the input of the first intermediate frequency amplifier, the output of which is the first output of the converter, the output of the second mixer through a serially connected second intermediate frequency amplifier and the phase-locked loop module is connected to the input of the second local oscillator, the output of which

0 is connected to the second input of the third mixer, the output of the second intermediate frequency amplifier is the second output of the converter.

Claims (1)

claims frequency converter of radio pulse signals containing the first, second, third and fourth mixers, first, second and third filters, first and second local oscillators, the inputs of the converter being the first inputs of the first and third mixers, the output of the first mixer through the first filter connected to the first input the fourth mixer, the output of which is connected to the input of the third filter, the output of the third mixer through the second filter is connected to the second input of the fourth mixer, the output of the first local oscillator is connected It is connected to the first, and the output of the second local oscillator to the second input of the second mixer, characterized in that, in order to expand the working range of input signal frequencies, the first and second intermediate frequency amplifiers, an amplitude detector, a threshold element, a trigger, a constant amplifier are additionally introduced into it current block phase-locked loop, and the output of the third filter through a series-connected amplitude detector, threshold element, trigger and DC amplifier connected to the input of the first local oscillator, the course of which is additionally connected to the second input of the first mixer, the output of the fourth mixer is additionally connected to the input of the first intermediate frequency amplifier, the output of which is the first output of the converter, the output of the second mixer is connected to the input of the second local oscillator through a series-connected second intermediate frequency amplifier and a phase-locked loop the output of which is additionally connected to the second input of the third mixer, the output of the second intermediate frequency amplifier is torym output transducer.