Communication semiconductor integrated circuit, radio...

Details Communication semiconductor integrated circuit, radio... Communication semiconductor integrated circuit, radio...

2011-06-14

2011-06-14

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

Reexamination Certificate

active

07961821

ABSTRACT:
A D.C. offset canceling and gain adjusting techniques permitting completion of correction of D.C. offsets and gain adjustment of amplifiers for amplifying reception signals in a radio communication system are provided. A communication semiconductor integrated circuit has a plurality of low-pass filters and variable gain amplifiers which are alternately connected in multiple stages, and high gain amplifier circuits for amplifying reception signals to a predetermined amplitude level. Offset cancellation values are generated by detecting D.C. offsets of amplifiers for amplifying reception signals according to a set gain, and stored into a memory, and read out of the memory to cancel the D.C. offsets of the amplifiers when starting reception and altering the gain. Gain setting in a high gain amplifying section is accomplished using rough and precise settings.

REFERENCES:
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patent: 6442380 (2002-08-01), Mohindra
patent: 6977976 (2005-12-01), Birkett et al.
patent: 7171185 (2007-01-01), Matsumoto et al.
patent: 2003/0156668 (2003-08-01), Atkinson et al.
patent: 2001 160835 (2001-06-01), None
patent: 2002 217762 (2002-08-01), None

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