Temperature compensated video signal processing circuit with...

Details Temperature compensated video signal processing circuit with... Temperature compensated video signal processing circuit with...

H - Electricity

04

N

350/47, 350/83

H04N 5/20 (2006.01) H03K 5/01 (2006.01) H04N 5/16 (2006.01)

Patent

CA 1043457

ABSTRACT OF THE DISCLOSURE 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 transis- tor 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 base- to-emitter voltage variation of the emitter follower transis- tor 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.

228418

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