Wireless communication semiconductor integrated circuit...

Details Wireless communication semiconductor integrated circuit... Wireless communication semiconductor integrated circuit...

2007-08-14

2007-08-14

Le, Lana N. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S251100, C455S253200

Reexamination Certificate

active

10948183

ABSTRACT:
A receiving circuit of a direct conversion system is provided which includes a differential amplifier circuit which amplifies a received signal, a mixer which combines the amplified received signal and an oscillation signal having a predetermined frequency to thereby perform frequency conversion, and a high gain amplifier circuit in which a plurality of programmable gain amplifiers and a plurality of filters which eliminate noise of the received signal and an unnecessary wave, are connected in a multistage and which is configured such that an amplification factor is varied according to the level of the received signal. In the receiving circuit, the low noise amplifier is brought to a non-operating state to thereby allow execution of a DC offset cancel operation of the corresponding programmable gain amplifier on the pre-stage side of the high gain amplifier circuit. Thereafter, the low noise amplifier is brought to an operating state to thereby allow execution of a DC offset cancel operation of the final-stage programmable gain amplifier.

REFERENCES:
patent: 5758271 (1998-05-01), Rich et al.
patent: 6515540 (2003-02-01), Prasad et al.
patent: 6763228 (2004-07-01), Prentice et al.
patent: 7050779 (2006-05-01), Ono et al.
patent: 2003/0020544 (2003-01-01), Behzad
patent: 2003/0022646 (2003-01-01), Bult et al.
patent: 2005/0107056 (2005-05-01), Okasaka et al.
patent: 2005/0130617 (2005-06-01), Burns et al.
patent: 2003-152480 (2003-05-01), None

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3843317