Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1992-08-25

1994-08-23

Kostak, Victor R.

Television

Synchronization

Sync separation

348679, 348682, H04N 552

Patent

active

053411730

ABSTRACT:
An automatic gain control circuit includes a first amplifier for receiving a video signal to produce a first signal with a gain varied in response to a control signal, a low-pass filter for removing a color component from the first signals to produce a second signal, a sync separator for separating synchronizing pulses from the second signal to produce a third signal, a delay circuit for delaying the third signal for a given time to produce a fourth signal, a clamper for clamping the second signal upon a constant reference voltage generated from a constant voltage generator 26, a sample and hold circuit 26 for receiving the fourth signal and a fifth signal to produce a sixth signal maintaining for a given time a level of a back porch of the fifth signal, a transconductance amplifier for comparing the sixth signal with a constant reference voltage to produce a difference signal as a seventh signal, a capacitor for integrating the seventh signals to produce a direct current error voltage as an eighth signal, and a second amplifier for receiving the eighth signal to produce a ninth signal applied to the first amplifier.

REFERENCES:
patent: 4658297 (1987-04-01), Nomura et al.
patent: 4667242 (1987-05-01), Hagino

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