TRANSISTOR CIRCUIT APPLICATIONS A STUDY OF TRANSISTOR VIDEO AMPLIFIERS

摘要

This report is concerned with the theoretical and experimental results of a study begun in the Fall of 1955 on the general subject of transistor low pass amplifiers. Since the work is still in progress, interim results are reported here.nMost of the effort has been concentrated on wide band response through the use of linear networks to extend the bandwidth beyond that obtainable using the transistors alone. This approach which is usually called equalization re¬quires as a basic starting point the specification of the network to be equal¬ized. In the case at hand a reasonably accurate transistor equivalent circuit must be found before the design of the compensating networks can proceed on a systematic basis. For this reason a good deal of effort has been expended on the small signal equivalent circuit of the Junction transistor from both the theoretical and experimental points of view. The theoretical work on this im¬portant subject has been first to review and check the results reported in the literature and second, to simplify the general equivalent circuit to fit the impedance conditions met in the video interstage. The representation used has for the most part been the common emitter h parameters and experimental checks have been made on alloy Junction, grown Junction and- surface barrier transistors.