Digitally controlled wide range automatic gain control

Details Digitally controlled wide range automatic gain control Digitally controlled wide range automatic gain control

H - Electricity

04

B

333/85, 328/0.1

H04B 1/16 (2006.01) H03G 3/20 (2006.01)

Patent

CA 1157100

A B S T R A C T DIGITALLY CONTROLLED WIDE RANGE AUTOMATIC GAIN CONTROL In high speed high quality modems it is important to be able to preserve the gain value for the automatic gain control, system during breaks in transmission to permit rapid resumption of normal operation. The a.g.c. circuit comprises a basic a.g.c. transistor amplifier whose emitter-collector conductance is varied by a control voltage derived from the envelope of the amplifier output voltage which is well known. A digital- to-analog converter is used which is controlled by a digital- up-down counter. The counter is controlled by a window com- parator which compares the rectified output voltage of the amplifier with a reference voltage level and upper and lower limits. If the output voltage exceeds either limit, the counter is enabled and the appropriate up or down indication is given. The counter is then clocked to change the drive to the d-to-a converter which thereby changes the conductance of the a.g.c. transistor. The state of the up down counter will be used to maintain the a.g.c. at the last level in the event of a transmission break by inhibiting the clock for the counter.

359614

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