DC offset correction for very low intermediate frequency...

Details DC offset correction for very low intermediate frequency... DC offset correction for very low intermediate frequency...

2007-10-02

2007-10-02

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S313000, C455S314000, C455S063100, C329S318000, C329S320000, C375S317000, C375S319000

Reexamination Certificate

active

10811579

ABSTRACT:
A wireless receiver includes a local oscillator, a mixer, a band pass filter, a DC offset determination module, a DC offset correction module, a subtraction module, and a down converter. The local oscillator produces a local oscillation that a mixer uses to down convert the RF information signal to produce a Very Low Intermediate Frequency (VLIF) information signal at a VLIF and having a DC offset. The band pass filter band pass filters the VLIF information signal. The DC offset determination module produces a DC offset indication for the VLIF information signal. The DC offset correction module generates a DC offset correction based upon the DC offset indication. The subtraction module subtracts the DC offset correction from the VLIF information signal to substantially remove a DC offset of the post-filtered VLIF information signal. The down converter down converts the VLIF information signal to a baseband information signal. In an alternate embodiment, the VLIF information signal is down converted to baseband prior to removal of the DC offset component, which then resides at −VLIF frequency.

REFERENCES:
patent: 6075409 (2000-06-01), Khlat
patent: 6240100 (2001-05-01), Riordan et al.
patent: 6442383 (2002-08-01), Iemura
patent: 6597748 (2003-07-01), Hietala et al.
patent: 6673340 (2004-01-01), Harrison et al.
patent: 6678340 (2004-01-01), Khlat et al.
patent: 6711393 (2004-03-01), Stenström et al.
patent: 6954628 (2005-10-01), Minnis et al.
patent: 7076225 (2006-07-01), Li et al.
patent: 7130359 (2006-10-01), Rahman
patent: 7136431 (2006-11-01), Shi et al.
patent: 2002/0151289 (2002-10-01), Rahman et al.
patent: 2002/0160738 (2002-10-01), Allott et al.
patent: 2003/0060180 (2003-03-01), Hall et al.
patent: 2003/0100286 (2003-05-01), Severson et al.
patent: 2003/0148750 (2003-08-01), Yan et al.
patent: 2004/0071238 (2004-04-01), Khlat et al.
patent: 2004/0146120 (2004-07-01), Brown
patent: 2006/0222117 (2006-10-01), Rahman et al.
patent: WO94/29948 (1994-12-01), None
patent: WO 02/30080 (2002-04-01), None
patent: WO 03/028206 (2003-04-01), None

Affiliated with

Also associated with

Rating

DC offset correction for very low intermediate frequency... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with DC offset correction for very low intermediate frequency..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DC offset correction for very low intermediate frequency... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3903092