Amplifier circuit and input circuit

Details Amplifier circuit and input circuit Amplifier circuit and input circuit

2008-03-18

2008-03-18

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S284000, C330S086000

Reexamination Certificate

active

07345546

ABSTRACT:
A disclosed amplifier circuit is capable of changing a gain to amplify an input signal according to a control signal. The amplifier circuit comprises a differential amplifier circuit adapted to receive and amplify the input signal to output the amplified input signal as an output signal, a first resistance and one or more second resistances connected to the differential amplifier circuit and adapted to set the gain, and one or more gain control circuits adapted to change the gain by controlling one or more electrical couplings of the one or more second resistances according to the control signal.

REFERENCES:
patent: 5581213 (1996-12-01), Linder et al.
patent: 6147558 (2000-11-01), Sculley
patent: 7068107 (2006-06-01), Wang et al.
patent: 7068108 (2006-06-01), Xu et al.
patent: 0774834 (1997-05-01), None
patent: 54 114228 (1979-09-01), None
patent: 58 218212 (1983-12-01), None

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