Abstract: An automatic gain control circuit includes an amplifier, the gain of which is to be controlled, and an input terminal for receiving an analog input signal. A first signal path is arranged between the input terminal and the amplifier and includes a controllable switch and a first filter. A second signal path is responsive to the input terminal and includes an analog-to-digital converter for providing digital signals representative of levels of the analog input signal. A signal processor receives the digital signals and provides control signals. A pulse width modulator receives the control signals and provides a pulse width modulated signal, the width of which varies in accordance with the digital signals, to the controllable switch.