Complementary constant-gm biasing of Nauta-transconductors in low-power gm-C filters to +/−2% accuracy over temperature

This paper describes the design of an accurate and simple static complementary constant-g m biasing circuit for Nauta's transconductors in low-power low-frequency CMOS g m -C bandpass filters and their optimization and trimming for process and temperature independent filter performance. Experim...

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Bibliographic Details
Main Authors: Jansen, R. J. E., Haanstra, J., Greenpeak, D. S.
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
Bandwidth
MOSFETs
Oscillators
Tuning
Voltage control
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Summary:This paper describes the design of an accurate and simple static complementary constant-g m biasing circuit for Nauta's transconductors in low-power low-frequency CMOS g m -C bandpass filters and their optimization and trimming for process and temperature independent filter performance. Experimental results are presented for a prototype 3 rd order Butterworth bandpass filter in a 180nm CMOS process with a 2MHz bandwidth and centre frequency. These filters are appropriate for the channel selection stage of a Zigbee receiver and show with a single trim for process over a 80C temperature range only a 2% deviation in the bandwidth and centre frequency.
ISSN:1930-8833
2643-1319
DOI:10.1109/ESSCIRC.2012.6341356