Amplifying apparatus with ac/dc feedback circuit

Amplifiers – With semiconductor amplifying device – Including d.c. feedback bias control for stabilization

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330 85, H03F 130

Patent

active

053250737

ABSTRACT:
An amplifying apparatus provided by the present invention comprises a direct-coupled inverting amplifier and an alternating-current feedback circuit as well as a direct-current feedback circuit connected between input and output terminals of the direct-coupled inverting amplifier, wherein the direct-current feedback circuit comprises an operating-point extracting circuit for extracting a direct-current component and a bias-voltage generator having a direct-current signal gain larger than an alternating-current signal gain thereof and a direct-current operating bias voltage of the direct-coupled inverting amplifier is set by using a signal output by the bias-voltage generator. Such a configuration enables the amplifying apparatus to offer high-speed operations, a large dynamic range and a highly stable direct-current operating point regardless of the type of a signal input therein and allows an alternating-current signal gain to be set independently of the stability of the direct-current operating point.

REFERENCES:
patent: 3331029 (1967-07-01), Banasiewicz et al.
patent: 4785257 (1988-11-01), Yokoyama
patent: 4939475 (1990-07-01), Prasse et al.

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