Highly Linear Tunable CMOS Gm}C Low-Pass Filter

A comprehensive analysis of tunable transconductor topologies based on passive resistors is presented. Based on this analysis, a new CMOS transconductor is designed, which features high linearity, simplicity, and robustness against geometric and parametric mismatches. A novel tuning technique using...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2009-10, Vol.56 (10), p.2145-2158
Main Authors: Acosta, L., Jimenez, M., Carvajal, R.G., Lopez-Martin, A.J., Ramirez-Angulo, J.
Format: Article
Language:English
Subjects:
Analog CMOS circuits
CMOS technology
continuous-time filters
Distortion measurement
Gm-C filters
harmonic distortion
Linearity
Low pass filters
MOSFETs
Resistors
Robustness
Topology
Transconductance
Transconductors
tunable filters
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Summary:A comprehensive analysis of tunable transconductor topologies based on passive resistors is presented. Based on this analysis, a new CMOS transconductor is designed, which features high linearity, simplicity, and robustness against geometric and parametric mismatches. A novel tuning technique using just a MOS transistor in the triode region allows the adjustment of the transconductance in a wide range without affecting the voltage-to-current conversion core. Measurement results of the transconductor fabricated in a 0.5- mum CMOS technology confirm the high linearity predicted. As an application, a third-order Gm-C tunable low-pass filter fabricated in the same technology is presented. The measured third-order intermodulation distortion of the filter for a single 5-V supply and a 2-V pp two-tone input signal centered at 10 MHz is -78 dB.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2008.2012218