SU748798A1

SU748798A1 - Frequency converter

Info

Publication number: SU748798A1
Application number: SU782567060A
Authority: SU
Inventors: Эдуард Александрович Шульц; Армир Борисович Кульман; Андрей Борисович Чубрик
Original assignee: Таллинский Политехнический Институт
Priority date: 1978-01-09
Filing date: 1978-01-09
Publication date: 1980-07-15

Description

1one

Изобретение относитс к области рй диотехлики и радисиамерений и может быть использовано в радиоприемных уотройствах , радиоизмерительных приборах и другихустройствах с переносом спектура влектрического сигнала. The invention relates to the field of diotech and radiation measurement and can be used in radio receiving devices, radio measuring devices and other devices with the transfer of the spectrum of an electric signal.

Известен преобразователь частоты,со- держащий формирователь противофазньк сигаалов, четыре диода, первый и второй из которых катодами подключены к соответствующим выходам фсумировател противофазных сигналов, гетеродин и нагрузку И.A frequency converter is known that contains an anti-phase signal shaper, four diodes, the first and second of which are connected by cathodes to the corresponding outputs of the anti-phase signal, the local oscillator and the load I.

Однако известный преобразователь частоты обладает низким коэффшшектом преобразовани .However, the known frequency converter has a low conversion ratio.

Цепью изобретени , вл1 етс расширение динамического диапазона входного сипиша в сторону увеличосин его уровн . Дл этого в преобразователе частоты содержащем фсрмироватоль противофазных сигналов, четыре диода, и второй нз которых катодами подключены к осот ветствующвсм выходам формировател The chain of the invention is the expansion of the dynamic range of the input signal in the direction of increasing its level. For this purpose, in the frequency converter containing anti-phase signals fsrmirovat, four diodes, and the second nz which are connected by cathodes to the corresponding outputs of the driver

противофазных сигналов, гетеродин и нагрузку , формирователь противофазныхсигналов выполнен в виде дифференциаль ного каскада на транзисторах с генёрато;ром тока в объединенных эмиттерных транзисторов, коллекторы которых вл ютс выходами формировател противофазных сигналов, при этом аноды первого и второго диодов подключеды к нагрузке , катоды третьего и четвертого диодов подключены к выходам формировател противофазных сигналов, а их аноды соединены с противофазными выходами гетеродина. На чертеке изображена принципиальна электрическа схема предложен г ного преобразовател частоты.antiphase signals, the local oscillator and the load, the antiphase signal shaper is made in the form of a differential cascade on transistors with a generator; the fourth diode is connected to the outputs of the shaper of the antiphase signals, and their anodes are connected to the antiphase outputs of the local oscillator. The circuit diagram shows the basic electrical circuit of the proposed frequency converter.

Преобразователь частоты содержит формирователь противофазных сигналов на траншсторах 1, 2 с генератором тока на транзисторе 3 в объединенных эмиттеpax , четьре диода 4-7, гетеродин 8 с противофазными выходами и нагрузку 9,The frequency converter contains an antiphase signal shaper on tranchstors 1, 2 with a current generator on transistor 3 in combined emitters, four diodes 4-7, local oscillator 8 with antiphase outputs and a load 9,

Claims

This frequency converter works as follows. The HacTOTibt transducer is one of the key transducers in which the Cicheta transform is based on the reproduction of a convertible signal with a heterodyne signal having a rectangular shape. The signal of the local oscillator 8 controls the operation of the diode switch of the current, implemented on the diodes, alternately connected to the load 9 either the collector of transistor 1 or the collector of transistor

2. The signal to be converted is fed through a random-capacitor to the base of transistor 1 ,. Into the differential cascade on the resistors 1 and 2 with the current generator on the transistor 3, In the first half-cycle of the heterodyne signal, the voltage on the anode of the diode 4 is positive, on the anode 7 is negative. At the same time, diode 4 is open, diode 5 is closed, and the collector current of transistor 1 is connected to the get home circuit. At the same time, diode 7 and one diode b are terminated with negative voltage, thereby the collector current of transistor 2 is connected to load circuit 9 In the second half-period of the heterodyne signal, the voltage on the anode of diode 4 is negative, on the anode 7, positive. In this case, the diode 4 is closed, the diode 5 is open, and the electrolyte current of transistor 1 is directed to the load 9. At the same time, the positive voltage diode 7 opens, diode 6 at In this case, zy, yy, and the collector current of transistor 2 is directed to the local oscillator circuit. TaKmvi way, sipshl heterodyne npot expels alternate connection nagru; To the antiphase outputs of the differential cascade, thereby providing a multiplication of the converted signal with a local oscillator signal, resulting in frequency conversion. Dynamic range expansion is achieved by reducing the nonlinear effects resulting from the nonlinearity of the transforming elements (diodes) by linearizing their characteristics with a high internal resistance of the former Anti-Phase Sitals. -74 8 When determining the dynamic range, the upper boundary of the input signal was defined as the level at which the 3rd-order level of intermodulation products is equal to the level of intrinsic noise, and the lower limit is defined as the level of the input signal at which the output level of the useful product is also equal to the level of its own noise. The dynamic range of the Frequency Converter, determined by the above criterion, is 95 dB, and the noise level is measured in the 3 kHz band. The technical and economic efficiency of a dash frequency converter consists in expanding the dynamic range and; in the absence of transformers, as a result of which the integrated design of the frequency converter is possible. Claims A frequency converter comprising an antiphase driver, a Chetjie diode, the first and second of which are connected by cathodes to the corresponding outputs of the antiphase signal generator, local oscillator, characterized in that, in order to increase the dynamic range of the input signal in the direction of increasing its level, the phase converter The signals are made in the form of a differential cascade on transistors with a current generator in the combined emitter circuits of transistors, the collectors of which These are the outputs of the anti-phase rifle shaper, while the anodes of the first and second diodes are connected to Harpyiskp, the cathodes of the third and fourth diodes are connected to the outputs of the shaper of pro-phage signals, and their anodes are connected to the heterodyne anti-phase outputs. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 359738, cl. H 03 D 7/14, 1971 (prototype).