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Complementary Constant- g_{m} Biasing of Nauta-Transconductors in Low-Power g_{m} C Filters to ±2% Accuracy Over Temperature

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3 Author(s)
Jansen, R.J.E. ; Eur. Space Res. & Technol. Centre, Eur. Space Agency, Noordwijk, Netherlands ; Haanstra, J. ; Sillars, D.

This paper describes the design of an accurate and static complementary constant-gm biasing circuit for Nauta's transconductors in low-power low-frequency CMOS gm-C bandpass filters and their optimization and trimming for process and temperature independent filter performance. Experimental results are presented for a prototype third-order Butterworth bandpass filter in a 180-nm CMOS process with a 2-MHz bandwidth and center frequency. These filters are appropriate for the channel selection stage of a Zigbee receiver and show with a single trim for process over a 120°C temperature range less than 2% deviation in the bandwidth and center frequency. Mismatch and process corner variation are demonstrated to have only a minimal effect on this performance.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:48 ,  Issue: 7 )

Date of Publication:

July 2013

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