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Video Amplifier Disclosure Number: IPCOM000039041D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01

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Morrish, AJ [+details]


A video amplifier is disclosed using industry standardized components which provide high performance in stability, accuracy and frequency response. The input video is to a resistive terminator which is independent of frequency at video frequencies. Gain is produced by a long tailed pair followed by a cascode pair. User controls are provided for contrast and brightness. The amplifier is designed for use in color and monochrome CRT displays. In a CRT display an amplifier is required to amplify the video signal, typically around 600 mV, up to the levels required to drive the CRT cathode, typically 45 V. This amplifier needs to be capable of changes in gain controlled by a DC voltage to enable a 'User' control to set the required contrast.