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Research Letters in Electronics
Volume 2009, Article ID 535809, 4 pages
Research Letter

Investigation of CMOS Varactors for High-GHz-Range Applications

Department of Electronics, Carleton University, Ottawa, ON, Canada K1S 5B6

Received 19 January 2009; Accepted 2 June 2009

Academic Editor: João Antonio Martino

Copyright © 2009 Ming Li 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.


This paper explores a variety of different CMOS varactor structures for RF and MMICs. A typical 0.18  𝜇 m CMOS foundry process was used as the study platform. The varactors' capacitance-voltage characteristics and cutoff frequencies have been examined up to 55 GHz. The primary aim of this work is to design varactors that can improve nonlinear-transmission-line (NLTL) pulse-compression circuits. The results should also be valuable for other applications up to millimeter wavelengths.