Variable gain amplifier circuit and gain control method thereof

Details Variable gain amplifier circuit and gain control method thereof Variable gain amplifier circuit and gain control method thereof

2006-02-28

2006-02-28

Shingleton, Michael B. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S098000, C330S254000, C455S234200, C455S245200, C455S246100, C455S247100

Reexamination Certificate

active

07005922

ABSTRACT:
In order to rapidly control the gains of a plurality of variable gain amplifiers VGAs, each of gain control circuits is configured to determine a gain to be set therein, based on gain control information received from other gain control circuits existing in its preceding stage or stages and the signal level detected by a level detector circuit connected thereto. By carrying out such gain control, a total application gain is stabilized more quickly by gain control. Therefore, even in receiving systems that the preparation period for reception is very short, desired gain control is achieved within this period and stable data reception can be performed.

REFERENCES:
patent: 4456889 (1984-06-01), Kumar
patent: 6498927 (2002-12-01), Kang et al.
patent: 6927628 (2005-08-01), Oshima et al.
patent: 2003/0218501 (2003-11-01), Oshima et al.
patent: 2002-016462 (2002-01-01), None
patent: 2003-347873 (2003-12-01), None
Stroet et al., “A Zero-IF Single-Chip Transceiver for up to 22Mb/s QPSK IEEE802.11b Wireless LAN,”ISSCC 2001,Session 13, No. 13.5, Visual Supplement, pp. 164 and 165.

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