Digital automatic gain controller for satellite transponder

Abstract

A digital automatic gain controller for a satellite transponder, comprising an amplification circuit for amplifying a radio frequency signal detected by a detector diode by a difference between the detected radio frequency signal and a temperature compensation signal, a microprocessor for inputting an output signal from the amplification circuit and outputting the inputted signal as a telemetry signal to the earth control station, the microprocessor adjusting an output level of a radio frequency channel in response to a telecommand signal from the earth control station based on the telemetry signal, and a conversion circuit for converting an output data signal from the microprocessor into a drive current for driving a PIN diode attenuator. According to the present invention, the digital automatic gain controller is capable of performing an automatic gain control operation flexibly and reliably on the basis of a program.

Dependencies are inferred from the claim text.