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VLSI Design
Volume 2017 (2017), Article ID 5369167, 12 pages
Research Article

Chebyshev Bandpass Filter Using Resonator of Tunable Active Capacitor and Inductor

Department of Electrical Engineering, Wright State University, Dayton, OH 45435, USA

Correspondence should be addressed to Chien-In Henry Chen

Received 13 March 2017; Accepted 24 April 2017; Published 18 May 2017

Academic Editor: Chang-Ho Lee

Copyright © 2017 Yu Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A classic second-order coupled-capacitor Chebyshev bandpass filter using resonator of tunable active capacitor and inductor is presented. The low cost and small size of CMOS active components make the bandpass filter (BPF) attractive in fully integrated CMOS applications. The tunable active capacitor is designed to compensate active inductor’s resistance for resistive match in the resonator. In many design cases, more than 95% resistive loss is cancelled. Meanwhile, adjusting design parameter of the active component provides BPF tunability in center frequency, pass band, and pass band gain. Designed in 1.8 V 180 nanometer CMOS process, the BPF has a tuning frequency range of 758–864 MHz, a controllable pass band of 7.1–65.9 MHz, a quality factor of 12–107, a pass band gain of 6.5–18.1 dB, and a stopband rejection of 38–50 dB.