Variable gain feedback amplifier circuit apparatus and...

Details Variable gain feedback amplifier circuit apparatus and... Variable gain feedback amplifier circuit apparatus and...

2006-06-29

2008-09-09

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S098000, C330S283000

Reexamination Certificate

active

07423487

ABSTRACT:
A variable gain feedback amplifier circuit comprising a degenerated common emitter circuit coupled to an emitter follower circuit, an output of the emitter follower circuit being coupled to an input of the degenerated common emitter circuit via a variable feedback impedance. An automatic gain controller is coupled to the variable feedback impedance in order to reduce a closed loop gain of the variable gain feedback amplifier circuit when required. The degenerated common emitter circuit also comprises a variable emitter impedance that is also controlled by the automatic gain controller so as to counteract a lowering effect of a reduction in the variable feedback impedance on the open-loop gain of the variable gain feedback amplifier circuit.

REFERENCES:
patent: 4608542 (1986-08-01), Siegel
patent: 4849712 (1989-07-01), Jarrett
patent: 6014061 (2000-01-01), Tachigori

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