Noise immune clamp circuit

Details Noise immune clamp circuit Noise immune clamp circuit

1974-11-12

1976-04-06

Richardson, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG12, H04N 518

Patent

active

039491650

ABSTRACT:
A transistor provides a hard clamp circuit for the video signal in a television receiver that is substantially noise immune. Such a clamp circuit is rendered increasingly immune to noise in proportion to increased frequencies above the sync frequency of the video signal by bypassing the emitter-base clamp diode with a capacitor. The effects of the base circuit impedance on the clamp impedance is reduced by employing a high beta transistor. In this manner impedance means may be employed to limit the loading of the video signal by the capacitor. Means are also provided to overcome any voltage supply irregularities from affecting the DC restored video signal so that substantially 100% DC restoration is achieved.

REFERENCES:
patent: 3324405 (1967-06-01), Corney
patent: 3526710 (1970-09-01), Martin
patent: 3700794 (1972-10-01), Loose

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