Table of Contents
International Journal of Microwave Science and Technology
Volume 2012, Article ID 302302, 11 pages
Research Article

Analysis and Design of Transformer-Based mm-Wave Transmit/Receive Switches

1Mobile and Wireless Group, Broadcom Corporation, Irvine, CA 92617, USA
2Berkeley Wireless Research Center (BWRC) and EECS Department, University of California, Berkeley, CA 94720-1770, USA

Received 23 February 2012; Accepted 15 May 2012

Academic Editor: Paolo Colantonio

Copyright © 2012 Ehsan Adabi and Ali M. Niknejad. 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.


Transformer-based shunt single pole, double-throw (SPDT) switches are analyzed, and design equations are provided. A mm-wave transformer-based SPDT shunt switch prototype was designed and fabricated in 90 nm digital CMOS process. It has a minimum insertion loss of 3.4 dB at 50 GHz from the single pole to the ON-thru port and a leakage of 19 dB from the single pole to the OFF-thru port. The isolation is 13.7 dB between the two thru ports. Large signal measurements verify that the switch is capable of handling +14 dBm of input power at its 1 dB compression point. The fabricated SPDT switch has a minute active area size of 60𝜇m×60𝜇m.