SU1406711A1 - Detection circuit - Google Patents

Abstract

This invention relates to a radio. The purpose of the invention is to increase the transmission coefficient while maintaining sensitivity. The detector contains a capacitor I, two transistors 2 and 3 of different structure, two RC low-pass filters 6 and 7, and a load 8. In order to increase the coefficient. The corresponding resistor 4 and 5 is connected to the emitter circuit of each transistor. A constant current flows through the emitter junctions of transistors 2 and 3, which reduces the potential transition barriers of the collector-base transistors 2 and 3 and thus keeps their sensitivity high in a wide dynamic range . The voltages on the collectors of transistors 2 and 3, after passing through RC filters 6 and 7, are summed at load 8, providing a factor of 2 times greater. transmitting the detector by voltage due to the addition of rectified voltages from opposite polarities of the input signal I il.

Description

 E. t

with s

cl

6

.

05

- {ZI

1-l

..

- Errum

This invention relates to radio engineering and is used for radio receivers.

The purpose of the invention is to increase the transmission coefficient while maintaining sensitivity.

The drawing shows an electrical schematic diagram of the proposed detector.

The detector contains a capacitor 1, two transistors 2 and 3 of different structure, two translations 4 and 5, two RC filters 6 and 7 lower ,, iCTOT, load 8.

The detector works as follows.

The input signal through the capacitor 1 through ivnaeT to the bases of the first and second transis-:, | sw 2 and 3, direct current flows through the circuit through the emitter junction of the kipipix; p. DSP power supply, which is made vo middle point, the first resistor 4, the emitter-base junction of the first transistor 2, the base-emitter junction of the second transistor 3, the second resistor 5, minus the power source. This current reduces the potential barriers of the collector-base transitions of the first and second transistors 2 and 3, and thus keeps their sensitivity high in a wide dynamic range, starting from low levels.

The voltages on the collectors of these transistors 2 and 3, obtained by detecting the input signal, have different polarity and, after passing through the first and second RC filters 6 and 7, are summed up at load 8, providing twice the voltage gain of the detector due to the addition of rectified voltages from opposite polarities of the input signal.

As a detecting p-p-junction transistors can also be used emitter p-ng-junction.

Claims (1)

Invention Formula A detector containing two transistors of different structure, to the base of one of which a capacitor is connected, the other output of which is the detector input, two RC low-pass filters, the input of each of which is connected to the collector of the corresponding transistor, and their outputs are the detector output , characterized by the TCs, that in order to increase the transmission coefficient while maintaining sensitivity, the corresponding resistor is inserted into the emitter circuit of each transistor, and the bases of the transistor are combined.