SU488157A1

SU488157A1 - Frequency converter

Info

Publication number: SU488157A1
Application number: SU1923992A
Authority: SU
Inventors: Леонид Дмитриевич Огороднийчук
Original assignee: Киевский Ордена Ленина Политехнический Институт Им.50-Летия Великой Октябрьской Социалистической Революции
Priority date: 1973-06-01
Filing date: 1973-06-01
Publication date: 1975-10-15

Description

1one

Изобретение относитс к гетеродинным преобразовател м частоты и может быть использовано в различных област х радиоэлектроники , в частности в радиоизмерительных устройствах, например фазометрах.The invention relates to heterodyne frequency converters and can be used in various fields of radio electronics, in particular in radio measuring devices, such as phase meters.

Известен преобразователь частоты, содержащий два измерительных канала, в каждом из которых включены смеситель с фильтрол, и общий канал. В последнем включен генератор с делителем, причем генератор через делитель подключен к смесител м измерительных каналов.Known frequency converter, containing two measuring channels, each of which includes a mixer with a filter, and a common channel. In the latter, a generator with a divider is turned on, the generator being connected through a divider to the mixers of the measuring channels.

Недостатком известного преобразовател частоты вл етс малое значение разв зки между измерительными каналами. В приборах с таким преобразователем частоты малое значение разв зки обусловливает большие погрещности измерений и ограничивает щирину частотного диапазона.A disadvantage of the known frequency converter is the small value of isolation between the measuring channels. In devices with such a frequency converter, a small isolation value causes large measurement errors and limits the width of the frequency range.

Целью изобретени вл етс увеличение раЗВ зки между измерительными каналами преобразовател частоты, что позвол ет повысить точность измерени и расширить частотный диапазон приборов, в которых примен етс подобный преобразователь. Это достигаетс тем, что общий канал преобразовател снабжен смесителем с фильтром и дополнительным делителем частоты с генератором, причем один вход смесител общего канала подключен к выходу делител частоты, а другой- к выходу дополнительного делител частоты , второй выход которого соединен с входом смесител одного из измерительных каналов .The aim of the invention is to increase the INFLUENCE BETWEEN the measuring channels of the frequency converter, which makes it possible to increase the measurement accuracy and broaden the frequency range of devices in which such a converter is used. This is achieved by the fact that the common channel of the converter is equipped with a mixer with a filter and an additional frequency divider with a generator, with one input of the common channel mixer connected to the output of the frequency divider, and the other to the output of the additional frequency divider, the second output of which is connected to the mixer input of one of the measuring channels.

На чертеже показана блок-схема описываемого преобразовател частоты.The drawing shows a block diagram of the described frequency converter.

Преобразователь частоты состоит из смесителей 1, 2, 3, делителей 4, 5, генераторов 6,The frequency converter consists of mixers 1, 2, 3, dividers 4, 5, generators 6,

7и фильтров 8, 9, 10 и имеет два входа и три выхода. Смеситель 1 с фильтром 8 и смеситель 2 с фильтром 9 включены в измерительные каналы, а смеситель 3 с фильтром 10, делители 4, 5 и генераторы 6, 7 включены в общий канал.7i filters 8, 9, 10 and has two inputs and three outputs. Mixer 1 with filter 8 and mixer 2 with filter 9 are included in the measuring channels, and mixer 3 with filter 10, dividers 4, 5 and generators 6, 7 are included in the common channel.

Два сравниваемых сигнала одной частоты с входов преобразовател поступают на входы соответственно смесителей 1, 2 измерительных каналов. На вторые входы этих смесителей , а также на входы смесител 3 общегоTwo compared signals of the same frequency from the converter inputs go to the inputs of the mixers 1, 2 of the measuring channels, respectively. On the second inputs of these mixers, as well as on the inputs of the mixer 3 common

канала через делители 4 и 5 поступают напр жени неодинаковых частот от гетеродинов- генераторов 6 и 7. Сигналы неравных промежуточных частот со смесителей 1, 2 и 3 через фильтры 8, 9 и 10 соответственно поступают на выходы преобразовател частоты.channels through dividers 4 and 5 receive voltages of unequal frequencies from heterodyne-oscillators 6 and 7. Signals of unequal intermediate frequencies from mixers 1, 2 and 3 through filters 8, 9 and 10 respectively arrive at the outputs of the frequency converter.

8выходных сигналах измерительных каналов сохран етс информаци об амплитудах и начальных фазах входных сигналов, а также о начальной фазе соответствующегоThe 8 output signals of the measurement channels retain information about the amplitudes and initial phases of the input signals, as well as the initial phase of the corresponding

Claims

generator. The output voltage of the common channel is stable in amplitude, contains in the argument the initial phases of the oscillators 6, 7 and serves as a reference for the further processing of intermediate frequency signals. The stability of intermediate frequencies is achieved by known methods. The separation between the measuring channels is due to three mixers and two dividers. When using mixers and balanced bridges, even with mediocre characteristics (as is the case, for example, in difficult-to-use VHF plots), it is easy to ensure separation of at least 90-100 dB in the frequency range of at least several octaves. The voltage of the generators and 7 as parasitic penetrate, respectively, into mixers 2 and 1, as well as the signals from the inputs - into mixer 3. However, their influence is negligible due to the disconnects existing in the common channel, introduced when one of the mixer voltages is weakened 3 to provide a linear 6 mode of its operation, as well as a rational choice of intermediate frequency values and filter characteristics for the suppression of parasitic components. A frequency converter comprising two measuring channels, each of which includes a filter mixer, and a common channel in which a frequency divider with a generator is included, characterized in that, in order to increase the isolation between the channels, the common channel is equipped with a mixer with a filter and an additional frequency divider with a generator, with one input of the common channel mixer connected to the output of the frequency divider, and the other to the output of the additional frequency divider, the second output of which is connected to the input of the mixer one of the measuring channels.