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Active-RC Filters Using the Gm-Assisted OTA-RC Technique

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3 Author(s)
Siva V. Thyagarajan ; University of California, Berkeley ; Shanthi Pavan ; Prabu Sankar

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 a way of combining Gm-C and active-RC integrators 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 μ m CMOS process, demonstrate the efficacy of Gm-assistance in an active-RC integrator.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:46 ,  Issue: 7 )