Title: Variable gain amplifier circuit and DC offset correction method and radio receiving device
Application Number: 200610092796 Application Date: 2006.06.14
Publication Number: 1881788 Publication Date: 2006.12.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03G3/30,H03F3/34
Applicant(s) Name: NEC Electronic Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: sun zhi lu jinhua
Abstract:
     A variable gain amplifier circuit according to an embodiment of the invention includes: an output offset correcting unit for executing correction to attenuate a fixed offset component independent of a gain change of a variable gain amplifier circuit out of a DC offset involved in an output voltage of an amplifying unit; and an input offset correcting unit for executing correction to attenuate an input offset component that varies depending on a gain of an amplifying unit. The correction of the fixed offset component with the output offset correcting unit and the correction of the input offset component with the input offset correcting unit are independently executed.
Time: 15
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