WIDE-BAND DIRECT CURRENT COUPLED AMPLIFIER FOR ALTERNATING CURRENT UTILITY

摘要

A wide-band direct-current-coupled amplifier for alternating current use having substantially flat operating characteristics and a high signal-to-noise ratio between input and output signal levels; the amplifier consisting of a high impedance input stage formed of a capacitive divider coupled to three FETs connected into a triple cascode circuit, which input stage, in turn, is connected to a cascoded differential amplifier; the output stage being an emitter follower. Suitable feedback which is adjustable for each operating range throughout the band is effective to provide an output signal that varies linearly in proportion to the input signal.