STUDY AND DEVELOPMENT OF TELEVISION PROJECTOR VIDEO AMPLIFIER TECHNIQUES.

摘要

To determine the most suitable technique to provide a wideband (30-mc) high level (150volts,peak-to-peak) video amplifier for use with experimental and developmental television projectors,various techniques for obtaining wideband amplification were investigated. The techniques investigated were: shunt,series and combination peaking,distributed amplification,negative feedback,and modulated radio frequency carrier. The primary problem was that of providing wideband amplification and high output level to a load that consisted of a resistor in parallel with various unavoidable capacitances which result from state output capacitance,stray and wiring capacitances,and the input capacitance of the driven device. The capacitance limits the bandwidth of the amplifier,inversely proportional to the resistor-capacitance product. The study resulted in the design and construction of a solid-state video amplifier,employing a combination of feedback and peaking techniques,which meets the required performance characteristics. The amplifier provides a bandwidth of 30Hz, a gain of 300and an output capability of 150volts. (Author)