5-6 GHz SPDT switchable balun using CMOS transistors

Byung Wook Min, Gabriel M. Rebeizt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This paper presents a new design and implementation of a CMOS single-pole-double-throw (SPDT) switch integrated within a transformer balun. The top two metal layers of a CMOS process are used for the primary and secondary inductors of the transformer. The secondary inductor is symmetrically wound, and the CMOS transistors are placed at the center-taps for the switching operation. The transformer is doubly tuned using the transistor parasitic capacitances and an integrated capacitor to overcome the limited coupling factor (k =0.76). The measured insertion loss of the switchable balun is 1.6-1.7 dB at 5-6 GHz for both ports with excellent input and output match, and the input 1-dB power compression point is 12 dBm. The integrated switchable balun occupies 250 × 240 μm2, and can be used for compact low-power T/R applications with a single-ended antenna and differential low-noise and transmit amplifiers. To our knowledge, this is the first implementation of a switchable transformer balun.

Original languageEnglish
Title of host publicationProceedings of the 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
Pages321-324
Number of pages4
DOIs
Publication statusPublished - 2008 Sep 25
Event2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008 - Atlanta, GA, United States
Duration: 2008 Jun 152008 Jun 17

Publication series

NameDigest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
ISSN (Print)1529-2517

Other

Other2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
CountryUnited States
CityAtlanta, GA
Period08/6/1508/6/17

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Min, B. W., & Rebeizt, G. M. (2008). 5-6 GHz SPDT switchable balun using CMOS transistors. In Proceedings of the 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008 (pp. 321-324). [4561445] (Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium). https://doi.org/10.1109/RFIC.2008.4561445