Digitally controlled filter tuning for WLAN communication...

Details Digitally controlled filter tuning for WLAN communication... Digitally controlled filter tuning for WLAN communication...

2006-05-23

2006-05-23

Mis, David (Department: 2817)

Telecommunications

Transmitter and receiver at same station

Reexamination Certificate

active

07050762

ABSTRACT:
A digitally controlled filter tuning method and corresponding WLAN (Wireless Local Area Network) communication devices and integrated circuit chips are provided. A WLAN communication signal is filtered by a tunable filter. A cut-off frequency of the tunable filter is tuned by a feedback loop. Tuning the cut-off frequency includes comparing by a comparator an output signal emitted by the tunable filter to a reference signal and emitting by the comparator a comparator signal indicative of the difference between the output signal and the reference signal. Further, tuning the cut off frequency comprises receiving the comparator signal by a tuning controller and setting by the tuning controller the cut-off frequency of the tunable filter based on the comparator signal by applying a digital tuning word to the tunable filter. The described filter tuning technique may reduce product and manufacturing costs while providing enhanced tuning accuracy.

REFERENCES:
patent: 5392456 (1995-02-01), Mitomo et al.
patent: 6208899 (2001-03-01), Kroll
patent: 6473466 (2002-10-01), Miyashita et al.

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