Automatic gain control circuit for both receiver and transmitter

Details Automatic gain control circuit for both receiver and transmitter Automatic gain control circuit for both receiver and transmitter

1995-02-09

1997-02-11

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 84, 4552451, 375345, 375342, 330129, 330279, H04B 7005

Patent

active

056031130

ABSTRACT:
A closed loop AGC circuit for a digital side of a dual mode cellular telephone wherein receiver and transmitter adjustable amplifiers are controlled by a linear feedback control system including a linear signal level detector which determines signal levels after a receiver baseband demodulator stage. The linear signal level detector receives a signal at an AC signal level and produces, through an averaging process, a DC received signal strength indication at a DC signal level which is linearly proportional to the AC signal level. The received signal strength indication is compared to a reference signal to produce a gain control signal which is linearly inverted and supplied as a receive gain control signal to the receiver adjustable amplifiers. The gain control signal is also combined with a transmit adjust signal received from the base station and supplied as a transmit gain control signal to the transmitter adjustable amplifiers.

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