AUTOMATIC GAIN CONTROL CIRCUIT FOR BURST SIGNAL COMMUNICATION SYSTEM

摘要

An automatic gain control (AGC) circuit for a burst signal communication system has an AGC amplifier for receiving a burst input and providing a burst output whose level is controlled in response to a control signal. A negative feedback circuit including an envelope detector receives the burst output and provides the control signal. The envelope detector envelope-detects the burst output and provides a first signal. A converter converts the first signal into a binary signal by comparing it with a reference voltage. A pulse generator provides a pulse signal of a predetermined pulse width in response to the binary signal. An AGC amplifier driving circuit digitally processes the pulse signal, thereby providing the control signal. The output power of the AGC circuit of the invention does not vary regardless of variation in the burst time.