Abstract: An adaptive clamping circuit for a video signal processing device includes a control signal generator for generating a control signal capable of controlling a speed of clamping operation in an input signal provided to the video signal processing device, a variable response signal generator for generating a variable response gain signal which enables the input signal to be adaptively clamped by selecting a time constant which is derived from a most significant bit (MSB) and which is adaptively changed in response to the control signal from the control signal generator, and a clamping circuit producing a direct current signal from output of the variable response signal generator and for applying the direct current signal to the input signal.