Signal amplifier

Details Signal amplifier Signal amplifier

2007-02-21

2009-06-30

Pascal, Robert (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

Reexamination Certificate

active

07554393

ABSTRACT:
A signal amplifier includes a discrete-variable-gain amplifying unit, a gain of which takes a discrete value and changes stepwise, a linear-variable-gain amplifying unit connected in series to the discrete-variable-gain amplifying unit, a gain of which changes continuously, control-signal outputting means for detecting a level of an output signal from a series connection circuit of the discrete-variable-gain amplifying unit and the linear-variable-gain amplifying unit and outputting a control signal corresponding to a difference between the level of the output signal and a reference voltage set as a comparative level to control the gain of the linear-variable-gain amplifying unit, and gain-switching control means for controlling to switch the gain of the discrete-variable-gain amplifying unit when the control signal deviates from a setting range for the control signal that is set according to a variable gain range of the discrete-variable-gain amplifying unit.

REFERENCES:
patent: 4070632 (1978-01-01), Tuttle
patent: 4360787 (1982-11-01), Galpin
patent: 6072339 (2000-06-01), Bertolini
patent: 60090408 (1985-05-01), None
patent: 9-246897 (1997-09-01), None

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