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A 3 V linear input range tunable CMOS transconductor and its application to a 3.3 V 1.1 MHz Chebyshev low-pass Gm-C filter for ADSL

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3 Author(s)
Jiunn-Yih Lee ; Electron. Res. & Service Organ., Ind. Technol. Res. Inst., Hsinchu, Taiwan ; Chien-Cheng Tu ; Wei-Hong Chen

A fully differential CMOS transconductor with 3 V linear input range is proposed. The Gm value of the transconductor is tunable through a current division scheme. A current mode arithmetic method is used to adaptively bias the transconductor tuning stage. A 3.3 V 1.1 MHz Chebyshev low-pass Gm-C filter using this highly linear transconductor achieves a IM3 distortion at 300 kHz of -62 dBc for a 2 Vppd input signal. The filter was fabricated with a double poly triple metal 0.35 μm CMOS process and consumes 66 mW

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Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000

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