Controllable amplifier circuit with a variable...

Details Controllable amplifier circuit with a variable... Controllable amplifier circuit with a variable...

2007-07-10

2007-07-10

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S254000, C330S051000, C330S12400D

Reexamination Certificate

active

11204521

ABSTRACT:
An amplifier circuit is disclosed in which a first amplifier stage and at least one second amplifier stage are each arranged between a signal input and a signal output. These amplifier stages are designed with a first gain factor and with a switching input. The amplifier circuit also has a third amplifier stage with a second gain factor, which is arranged between the signal input and the signal output. A control circuit is coupled to each amplifier stage for gain adjustment. The control circuit has a first control block designed for single-ended signal processing, and a second control block designed for push-pull signal processing. It is designed to supply control signals from the first control block to the amplifier stage when the gain of the first and at least one second amplifier stage is varied, and to supply control signals from the second control block to all of the amplifier stages when the gain of the at least one third amplifier stage is varied.

REFERENCES:
patent: 5216384 (1993-06-01), Vanhecke
patent: 5977828 (1999-11-01), Hu et al.
patent: 6377121 (2002-04-01), Giduturi
patent: 6864746 (2005-03-01), Cheah et al.
patent: 2005/0225390 (2005-10-01), Klein et al.
patent: 2006/0022748 (2006-02-01), Udagawa
patent: 101 63 466 (2003-07-01), None
patent: 2 091 054 (1982-07-01), None

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