SU382219A1 - FREQUENCY CONVERTER - Google Patents

Description

one

The present invention relates to a class of devices for frequency conversion, multiplication deviation, limiting and amplifying FM signals and non-modulated oscillations.

A known frequency converter comprising low-frequency and high-frequency band amplifiers with corresponding selective quadrupoles, two shift mixers, a delay line and a generator of high-frequency oscillations.

A disadvantage of the known converter is the low transmission coefficient of the unconverted signal and the significant inertia of the frequency conversion of the unmodulated oscillations.

The proposed device differs from the known one in that band amplifiers with selective quadripoles are connected in a series ring self-exciting circuit so that their inputs and outputs are interconnected through shear mixers, the heterodyne inputs of which are combined at the output of the exciting oscillator, and the resonant frequencies of the selective quad-pole amplifiers are selected from the condition that their sum (difference) is equal to the carrier frequency of the generator, while the electoral quadripoles are performed in non-minimum phase circuits, the control input of which is x, With electrical

2

the frequency adjustment is connected to the generator output of the control function, which means that there is no change in the frequency of the non-modular P1Yh oscillations, as well as or depiats; oscillation frequencies with angular modulation without changing the average frequency of the spectrum according to the law of control:, cii (lx) duliruyus1SR11) function.

The drawing shows a functional block diagram of a portable device.

The proposed frequency converter consists of an oscillation of its head 1strator /, two mixers 2 and 2, respectively, “up and

, W ROKOPOLOE 10GO HIGHLY FREQUENCY1 CSO

Amplifier 3 with C Stem1 filters 4 and a bandwidth of the intermediate frequency (IF) with f 1ltrov m quadrupole 1 clod.

Prologa ga s il il | i cob ra i aa te. There is an auto-oscillator with homodyne neuron) of 1 cm of frequency in the feedback circuit, which makes it difficult to complete the conditions of the phase loop. An annular follower of a Sch11 blockband B4 amplification of a solid path with a 5-hf intermediate frequency (IF) bandwidth amplifier with an optical system 6 through mixers 2 and 2 forms upward shift in the absence of an excitation generator / open feedback with a factor effort and around the ring - due to the separation of sharp-frequency frequencies and bandwidths of amplifying paths.

The closure of the feedback loop and the occurrence of autogeneration occurs only when parallel output is applied simultaneously to both mixers of the output voltage shift from the excitation generator /, if the frequency meets the condition

/ vg - / Bc i / rf

where / vg is the frequency of the exciting generator; / fc is the resonant frequency of the low-frequency UPCH; / HF - frequency lying in the band of the RF amplifier.

The loop gain in this case must exceed one unit: and the frequency of the established oscillations is determined from the phase balance of the closed ring and is always inside the passage of the high and low frequency amplifying paths.

IIojTOMy ce stability is determined only by torsional T; phase-frequency characteristics of the UHF 3 paths with a system of filters 4 and UPCH 5 with a system of filters 6 and the stability of the exciting generator / that uniquely sets the nominal self-excitation frequency of the circuit.

Subject invention

A frequency converter comprising low frequency and high frequency band amplifiers with corresponding selective quadrupoles, two shift mixers, a delay line and a high frequency oscillator, characterized in that, in order to instantly convert the frequency of unmodulated oscillations, and multiply or divide the oscillation frequency deviation with angular modulation without changing the average frequency of the spectrum according to the law of the control (modulating) function, the band

amplifiers with selective quadrupoles are connected in a serial ring self-exciting circuit so that their inputs and outputs are interconnected through shear mixers whose heterodyne inputs are connected to the output of the generator, and the resonant frequencies of selective quadrupole band amplifiers are chosen from the condition that their sum (difference) is the carrier frequency of the generator, while the selective quadrupoles are made in the form of non-minimal phase circuits, the control input of one of which, with an electronic transmitter frequency tuning is connected to the output of the control function generator.