Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Reexamination Certificate
2011-08-23
2011-08-23
Nguyen, Duc (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
C455S081000, C455S121000, C455S193200
Reexamination Certificate
active
08005448
ABSTRACT:
The present invention is an RF duplex filter that is used to remove transmit signals from the receive path of a full duplex transceiver. The RF duplex filter includes a notch filter for blocking signals at a transmit frequency and a bandpass filter for enhancing signals at a receive frequency. The notch filter is formed with series resonant elements and the bandpass filter is formed with parallel resonant elements. One embodiment of the present invention may include tunable resonant elements for tuning the notch filter to a transmit frequency, tuning the bandpass filter to a receive frequency, or both. Calibration circuitry may be included in the full duplex receiver for adjusting the tunable resonant elements. The present invention includes a method for calibrating the tunable resonant elements.
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Lee, Thomas H. et al., “5-GHz CMOS Wireless LANs,” IEEE Transactions on Microwave Theory and Techniques, Jan. 2002, pp. 268-280, vol. 50, No. 1, IEEE.
Yan Kelvin Kai Tuan
Yang Dong-Jun
Akinyemi Ajibola
Nguyen Duc
RF Micro Devices, Inc.
Winthrow & Terranova, P.L.L.C.
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