Full 360° vector-sum phase-shifter for microwave system applications

  • Authors:

  • You Zheng;Carlos E. Saavedra

  • Affiliations:

  • SkyWave Mobile Communications, Ottawa, ON, Canada and The Queen's University, Kingston, ON, Canada;Department of Electrical and Computer Engineering, Queen's University, Kingston, ON, Canada

  • Venue:
  • IEEE Transactions on Circuits and Systems Part I: Regular Papers
  • Year:
  • 2010

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Abstract

An innovative vector-sum phase shifter with a full 360° variable phase-shift range is proposed and experimentally demonstrated in this paper. It employs an active balun and a very high-speed CMOS operational transconductance amplifier (OTA) integrator to generate the four quadrature basis vector signals. The fabricated chip operates in the 2-3 GHz, it exhibits an average insertion gain of 1.5 dB at midband, and has an RMS phase error below 5° over the measured frequency span. The chip consumes 24 mW of DC power and is highly compact, measuring only 0.38 mm2 including bonding pads.