TEMPERATURE COMPENSATED VIDEO SIGNAL PROCESSING CIRCUIT WITH A VIDEO SIGNAL CLIPPING DEVICE

摘要

In a video signal processing circuit, a temperature dependent variation of the voltage drop across a clipping pn junction device which causes the clipping voltage level of a DC restored video signal to vary is compensated by the base to-emitter voltage variation of an emitter follower transistor having substantially the same temperature characteristic as the clipping pn junction device. A variation in the DC level of the DC restored video signal resulting from the baseto-emitter voltage variation of the emitter follower transistor is compensated by a feed back type differential amplifier whose output is fed back to one input thereof through an emitter follower transistor and a pn junction device.