POWER AMPLIFIER WITH AUTOMATIC BIASING AND INSENSITIVITY TO TEMPERATURE VARIATIONS

摘要

A power amplifier having means for self biasing an emitter follower output stage over a range of temperatures comprises two matched transistors having the bases thereof directly coupled together such that the base-emitter potentials of the transistors are equal in magnitude and opposite in direction. Consequently, the output current is dependent only upon the value of the input current and resistance and the output resistance. A particular embodiment for this power amplifier utilizes two symmetrical power amplifier circuits that are complementary to one another in a push-pull arrangement.