SU368710A1 - PHASE SENSITIVE RECTIFIER - Google Patents

Description

one

This invention relates to the field of radio engineering.

Phase-sensitive rectifiers, made on a transistor switch and containing sources of input and reference voltages, are known.

In such phase-sensitive rectifiers, the elimination of the galvanic high-frequency coupling between the input and output circuits is achieved by the input transformer.

However, in the case of a low frequency AC input signal, the dimensions of the input transformer are large.

The aim of the invention is to eliminate the galvanic and high-frequency connection between the input and output circuits without the use of an input transformer.

In the proposed device, this goal is achieved through the use of a storage capacitor and additional controlled transistor switches.

A schematic diagram of the proposed device is shown in the drawing.

The device contains a transformer I of the reference control voltage, transistor switches 2-5 with limiting resistors 6-I storage capacitor 10, a smoothing capacitor //, a transition capacitor 12 and a leakage resistor 13.

The scheme works as follows.

Assume that the input signal has a positive polarity in the first state of the controlled keys, and a negative polarity in the second. Since at this moment the storage capacitor 10 is connected parallel to the input of the rectifier to the resistor 13 (the AC resistance of the capacitor 12 can be neglected), the capacitor 10 as a result of repeated repetition of the indicated state of controlled keys is charged with a positive potential proportional to the amplitude of the input signal f / BX.

As a result of repeated repetition of the second of the indicated states of the controlled keys, when the capacitor 10 is connected in parallel with the smoothing capacitor 11 connected at the output of the rectifier, the capacitor 11 acquires a potential equal to the potential of the capacitor 10. Thus, at the output of the rectifier (capacitor 11) rectified and smoothed positive polarity voltage, proportional to the amplitude of the input signal. In the event of a change in the phase of the input signal to the opposite, these processes lead to the charge of the capacitor 11 at the output of the rectifier by the voltage of opposite polarity

also the proportional amplitude of the input signal.

At the same time, for both of the indicated states of controlled keys, the output of the phase-sensitive rectifier is completely disconnected from its input either by a pair of private keys 2, 4 (in the first state) or a pair of private keys 3, 5 (in the second state).

Due to the high reverse resistance of the private keys, the input of the proposed phase-sensitive rectifier in either of the two indicated states of the controlled keys is disconnected from the input not only by direct current, but also by higher-frequency components.

Subject invention

A phase-sensitive rectifier containing an input voltage source, transistor switches controlled from a source of reference frequency pulses, characterized in that, in order to eliminate galvanic and high-frequency coupling between the input and output circuits, the transistor switches are connected in series and pairwise between the same input and output terminals, and a memory capacitor is connected in parallel with the input and output terminals between the connection points of the emitters of the keys.

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