Patent · US Expired

Digitally controlled filter tuning for WLAN communication devices

US7050762B2 · kind B2 · utility

7Cited by

3References

42Claims

0Family size

Assignee

Advanced Micro Devices, Inc. · US

Inventors

Juergen Boldt · Dresden, DE
Wolfram Kluge · Dresden, DE
Sascha Beyer · Medingen, DE

Key dates

Filing date	Oct 21, 2004
Grant date	May 23, 2006
Priority date	—
Expiry date	Dec 2, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH03H11/1291
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.