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A Gm-C low-pass filter for zero-IF mobile applications with a very wide tuning range

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4 Author(s)
D. Chamla ; IEMN/ISEN, Lille, France ; A. Kaiser ; A. Cathelin ; D. Belot

A third-order Gm-C Butterworth low-pass filter implementing Gm-tuning and Gm-switching to maximize the tuning range is described. This filter is intended to be used as a channel-selection/anti-aliasing filter in the analog baseband part of a zero-IF radio receiver architecture for multimode mobile communications. Its Gm-switching feature allows extending the tuning range and adapting the power consumption. The filter's cutoff frequency ranges from 50 kHz to 2.2 MHz. An Input IP3 of up to +18 dBVp is achieved, for a total worst-case power consumption of 7.3 mW for both I and Q paths, and an effective area of less than 0.5 mm2 in a 0.25-μm SiGe BiCMOS process. A new figure of merit is introduced for comparison of published low-pass tunable filters including noise, linearity, and tuning range.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:40 ,  Issue: 7 )