A 76-84 GHz SiGe power amplifier array employing low-loss four-way differential combining transformer

Mury Thian, M. Tiebout, N.B. Buchanan, V.F. Fusco, F. Dielacher

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

This paper presents holistic design of a novel four-way differential power-combining transformer for use in millimeter-wave power-amplifier (PA). The combiner with an inner radius of 25 µm exhibits a record low insertion loss of 1.25 dB at 83.5 GHz. It is designed to simultaneously act as a balanced-to-unbalanced converter, removing the need for additional BALUNs typically required in differential circuits. A complete circuit comprised of a power splitter, two-stage differential cascode PA array, a power combiner as well as input and output matching elements was designed and realized in SiGe technology with f/f 170/250 GHz. Measured small-signal gain of at least 16.8 dB was obtained from 76.4 to 85.3 GHz with a peak 19.5 dB at 83 GHz. The prototype delivered 12.5 dBm output referred 1 dB compression point and 14 dBm saturated output power when operated from a 3.2 V dc supply voltage at 78 GHz.
Original languageEnglish
Article number6384853
Pages (from-to)931-938
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume61
Issue number2
DOIs
Publication statusPublished - Feb 2013

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