Communication semiconductor integrated circuit, radio...

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

2004-05-28

2008-12-30

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

Reexamination Certificate

active

07471748

ABSTRACT:
A D.C. offset canceling technique and a gain adjusting technique permitting completion of correction of D.C. offsets and gain adjustment of amplifiers for amplifying reception signals in a relatively short period of time in a radio communication system, such as a wireless LAN, are to be provided. A communication semiconductor integrated circuit (high frequency IC) has a plurality each 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 while eliminating unnecessary waves. Offset cancellation values are generated by detecting in advance 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 at the time of starting reception and altering the gain. Gain setting in a high gain amplifying section for amplifying reception signals is accomplished in two steps, rough setting and precise setting.

REFERENCES:
patent: 6321073 (2001-11-01), Luz et al.
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

Affiliated with

Also associated with

Rating

Communication semiconductor integrated circuit, radio... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communication semiconductor integrated circuit, radio..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication semiconductor integrated circuit, radio... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4021045