The EL2090C is the first complete DC-restored monolithic video amplifier sub-system It contains a very high-quality video amplifier and a nulling sample-and-hold amplifier specifically designed to stabilize video performance When the HOLD logic input is set to a logic 0 during a horizontal sync the sampleand-hold amplifier may be used as a general-purpose op-amp to null the DC offset of the video amplifier When the HOLD input goes to a logic 1 the sample-and-hold stores the correction voltage on the hold capacitor to maintain DC correction during the subsequent scan line