Radio receiver having direct DC offset compensation

Details Radio receiver having direct DC offset compensation Radio receiver having direct DC offset compensation

2006-07-18

2006-07-18

Tran, Khai (Department: 2637)

Pulse or digital communications

Receivers

Automatic baseline or threshold adjustment

C455S258000

Reexamination Certificate

active

07079595

ABSTRACT:
An FM radio receiver includes a low noise amplifier, down conversion mixing module, local oscillation module, bandpass filter, demodulation module, and a DC offset estimation module. The low noise amplifier, the down conversion mixing module, the bandpass filter, and the demodulation module are operably coupled to recapture data from a received a radio frequency (RF) signal. The local oscillation module is operably coupled to generate the local oscillation based on a reference oscillation and a DC offset correction signal. The DC offset estimation module is operably coupled to generate the DC offset correction signal based on a determined a DC offset. The DC offset estimation module determines the DC offset prior to compensation of the local oscillation, such as during a test sequence and/or during a preamble. As such, the local oscillation initially produces the local oscillation based on the reference oscillation and, once the DC offset correction signal has been determined, the local oscillation is adjusted based on the determined DC offset to substantially match the local oscillation of the transmitting radio.

REFERENCES:
patent: 6314278 (2001-11-01), Zamat
patent: 6819910 (2004-11-01), Shi et al.
patent: 2002/0160738 (2002-10-01), Allott et al.
patent: 2003/0194984 (2003-10-01), Toncich et al.
patent: 2003/0197810 (2003-10-01), Jaffe
patent: 2003/0202619 (2003-10-01), Ibrahim et al.
patent: 2005/0009491 (2005-01-01), Anand et al.

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