Clamp circuit

Details Clamp circuit Clamp circuit

1991-11-25

1993-03-09

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307562, 358 33, 358172, H03K 508, H04N 964, H04N 518

Patent

active

051928850

ABSTRACT:
A clamp circuit is described in which a video signal is capacitively coupled to an amplifier which has enabled and disabled states. An operational amplifier receives the output of the amplifier and a reference voltage and the output of the operational amplifier is fed back to the inputs of both the amplifier and the operational amplifier. The loops may be selectively disconnected and the amplifier selectively disabled so that the output of the amplifier has the same level during each of three modes namely clamp mode when the video signal is known to be black, image mode during normal operation when the video signal returns to black, and during blank mode initiated at any other desired time.

REFERENCES:
patent: 4564863 (1986-01-01), Chameroy et al.

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