Driver for N-channel VFET output stage of power amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330269, 330272, H03F 326

Patent

active

056316089

ABSTRACT:
An input driver stage for an audio power amplifier wherein the amplifier incorporates only N-channel VFETs in the output stage, the invention locks the currents in second stage (via a closed loop) which is directly connected to the VFET output stage thus allowing precise open loop predictive temperature compensated programming of the quiescent operating point of the VFET output stage into an acceptable linear area of operation--without fettering the amplifiers inherent straight forwardness OF implementation or the amplifiers excellent signal amplification characteristics.

REFERENCES:
patent: 4093925 (1978-06-01), Yokoyama
patent: 4241313 (1980-12-01), Takehara

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