A wide-band class-B video output driver

A wideband class-B video output driver integrated circuit is described. The circuit contains analog/digital, brightness, contrast, subcontrast, and black-level inputs. The 5-V IC dissipates 500 mW and can deliver up to 150 mA with 1-ns rise and fall times to discrete power transistors driving a CRT (cathode ray tube). The die size is 100*100 mils/sup 2/, and the circuit is fabricated in an 8-GHz Si bipolar technology. A design philosophy based on noninteracting gain blocks operating on current variables allows a number of wideband functions to be independently designed and cascaded. These include black-level clamping, level shifting, gain control, and power amplification.<
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