Improvements in or relating to transistor push-pull amplifiers

Abstract

Abstract 764,154. Transistor amplifying circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 11, 1955 [Feb. 16, 1954], No. 4154/55. Class 40(6) In a push-pull amplifier comprising transistors 7, 8 in Class AB, B or C connection, the push-pull signal is supplied through blocking capacitors 5, 6 to the input electrode of the transistors, whilst in order to produce the required bias voltage, the input electrode is connected to a rectifier path having a pass direction which is opposite that of the transistor viewed from the input electrode concerned. The junction transistors 7. 8 have associated with the base-emitter path rectifiers 13, 14 and resistors 15, 16. The resistors 13, 14 are arranged to be equal to the forward resistance of the base-emitter path of the transistors 7, 8. The addition of the rectifier path preventing a voltage being built up on the capacitors 5, 6 due to rectification in the base-emitter paths of the transistors 7, 8. In a modification, Fig. 2, employing point contact transistors 21, 22 diodes 13, 14 are applied across the emitterbase-lead and are poled in the opposite direction from current flow in the emitterbase path. In a further modification Fig. 3 (not shown), the emitter-base path of each junction transistor acts as the rectifier path for the other.

Inventors

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