NDLI: A silicon-based, all-passive, 60 GHz, 4-element, phased-array beamformer featuring a differential, reflection-type phase shifter

Content Provider	IEEE Xplore Digital Library
Author	Krishnaswamy, H. Valdes-Garcia, A. Jie-Wei Lai
Copyright Year	2010
Description	Author affiliation: Mediatek Inc., Hsinchu, Taiwan, ROC (Jie-Wei Lai) \|\| Department of Electrical Engineering, Columbia University, NY (Valdes-Garcia, A.) \|\| IBM T. J. Watson Research Center, Yorktown Heights, NY (Krishnaswamy, H.)
Abstract	This paper presents an all-passive, 4-element, phased-array beamformer based on a differential, reflection-type phase shifter (RTPS) operating in the 60GHz band. The RTPS consists of a differential, vertically-coupled, coupled-line hybrid and variable, parallel-LC, resonant, reflective loads, both of which enable low-loss millimeter-wave operation. The design considerations for a silicon-based implementation of all the beamformer elements are discussed in detail. In particular, the influence of the different RTPS components on its insertion loss is analyzed. The beamformer IC and a breakout of the RTPS are implemented using CMOS-only features of IBM's 8HP 0.13¡jm SiGe BiCMOS process, and employ areas of $2.1mm^{2}$ and $0.33mm^{2},$ respectively, without probe pads. Differential s-parameter measurements at 60GHz show a phase-shift range greater than 150°, insertion losses of 4–6.2dB in the RTPS and 14–16dB in the beamformer, and an isolation better than 35dB between adjacent beamformer channels. Measurements across temperature and process variations are also presented.
Starting Page	225
Ending Page	232
File Size	1125387
Page Count	8
File Format	PDF
ISBN	9781424451272
DOI	10.1109/ARRAY.2010.5613365
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Varactors Insertion loss Capacitance Loss measurement Impedance Transmission line measurements Metals
Content Type	Text
Resource Type	Article

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