Amplifying circuit, AC signal amplifying circuit and input...

Details Amplifying circuit, AC signal amplifying circuit and input... Amplifying circuit, AC signal amplifying circuit and input...

2011-05-24

2011-05-24

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000, C330S136000

Reexamination Certificate

active

07948318

ABSTRACT:
An amplifying circuit includes: an amplifying unit which amplifies an input signal and applies the amplified signal to a designated load; a current detection unit which detects a load current that flows into the designated load upon application of the amplified signal; an estimating unit which calculates, based on the voltage level of the input signal, an estimated value of the load current to be supplied to the load; and an adjusting unit which adjusts an input bias, to be applied to the amplifying unit, in such a manner so as to reduce a difference value representing a difference between the estimated value and the load current detected by the current detection unit.

REFERENCES:
patent: 6198315 (2001-03-01), Nakano
patent: 6507227 (2003-01-01), Genova et al.
patent: 7098740 (2006-08-01), Kondo et al.
patent: 7221102 (2007-05-01), Kotani et al.
patent: 7804310 (2010-09-01), Amada
patent: 7873335 (2011-01-01), Hug et al.
patent: 3-249810 (1991-11-01), None
patent: 2004-274316 (2004-09-01), None

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