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Ultra-Wideband Front-End With Tunable Notch Filter

Kenneth A. Townsend, Leonid Belostotski, James W. Haslett and John Nielsen
IEEE North-East Workshop on Circuits and Systems (NEWCAS'06), Gatineau, Quebec, pp. 177-180, June 18-21, 2006

This paper presents the design of an LNA with integrated tunable notch filter targeted for UWB receivers. Impulse-based UWB systems suffer from an increased BER in the presence of strong interferers due to reduced SNR. The first stage of the LNA achieves a wideband input match while the second stage employs an integrated bridged-T filter for interferer cancellation. The LNA has been implemented in a standard 0.18um CMOS process. Simulated results show the notch filter is tunable from 3.5GHz to 7.0GHz with greater than 40dB of rejection. For a notch frequency of 5.3GHz, the noise figure and gain at 3.5GHz are 4.1dB and 12.1dB respectively.

CONTACTS: Ken Townsend, Leo Belostotski, Jim Haslett, John Nielsen
SUBJECTS: RF Circuits and Systems
TYPE: Conference Publication
PUBLISHED: 2006

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