Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 46, Issue 7, Pages 1522-1533Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2011.2143590
Keywords
Active-RC filter; gm-C filter; operational amplifier; operational transconductance amplifier (OTA); Gm-OTA-C; linear filter; intermodulation distortion; linearization; triode mode transconductor; channel selection; tuning; resistor servo; folded cascode; assisted opamp
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Funding
- Ministry of Information Technology, Government of India
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The linearity of conventional active-RC filters is limited by the operational transconductance amplifiers (OTAs) used in the integrators. Transconductance-capacitance (Gm-C) filters are fast and can be linear- however, they are sensitive to parasitic capacitances. We explore the Gm-assisted OTA-RC technique, which is away of combiningGm-C and active-RCintegrators in a manner that enhances the linearity and speed of the latter, while adding negligible extra noise or power dissipation. Measurements from a fifth-order Chebyshev filter with 20 MHz bandwidth, designed in a 0.18 mu m CMOS process, demonstrate the efficacy of Gm-assistance in an active-RC integrator.
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