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Video Amplifier for CRT Display

IP.com Disclosure Number: IPCOM000034524D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Morrish, AJ [+details]

Abstract

CRT displays require an analog amplifier having high bandwidth, DC controlled gain, good linearity and low component count. A video amplifier with these properties is disclosed using an available NPN transistor module with accurately matched transistor pairs. It provides 45 V or more video output up to video clock rates in excess of 50 MHz, making it suitable for monochrome or colour displays. Fig. 1 shows the basic video amplifier circuit using transistors in an IC array module type CA3046. The video signal is terminated at the input by R1 and AC coupled into the base of the emitter follower Q1. Transistor Q2 is turned on by a flyback pulse every cycle to clamp the voltage across C1.