Transistor amplifier and mixer input stage for a radio receiver

Details Transistor amplifier and mixer input stage for a radio receiver Transistor amplifier and mixer input stage for a radio receiver

1984-10-01

1987-11-03

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455249, 455326, 455332, 455333, 330254, 330284, 332 43B, H04B 126

Patent

active

047047380

ABSTRACT:
The input stage of a radio receiver incudes a differential amplifier circuit, whose gain is adjusted by a voltage generated by an AGC circuit, and a mixer circuit. An attenuator stage with a predetermined attenuation coefficient is coupled between the input terminal of differential circuit and the input terminal of the mixer circuit. When the level of the input signal increases beyond a given value, the differential amplifier circuit is deactivated and the signal reaches the mixer circuit through the attenuator stage.

REFERENCES:
patent: 3431506 (1969-03-01), Hirscfield et al.
patent: 4301455 (1981-11-01), Robinson

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