A 44-64 GHz Broadband 90o Hybrid Doherty PA with Quasi Non-Foster Tuner in 0.13μm SiGe

Zheng Liu, Yiming Yu, Kaushik Sengupta

Research output: Contribution to journalArticlepeer-review


This paper presents a simultaneously broadband and back-off efficient mm-wave linear Doherty PA utilizing quadrature hybrid and a Doherty bandwidth enhancement technique exploiting quasi Non-Foster impedance synthesis at the quadrature isolation port. We show analytically the design methodology of the Non-Foster synthesis with on-chip impedance tuner that allows broadband back-off efficiency, without suffering from nonlinearity due to the low leakage power of the isolated port. Across 44-64 GHz, the proposed SiGe PA achieves collector efficiency of 26-34.7% at peak power and 14-23.2% at 6dB back-off with 18.5-21.5 dBm Psat and peak gain of 18.5 dB. It supports 6 Gbps 64QAM signal with -26.5 dB/-28.3 dBc EVM/ACLR at average Pout/PAE of 14.6 dBm/14.6% at 54 GHz. To best of authors’ knowledge, this work achieves highest bandwidth among silicon-based mm-wave PAs where higher than class-B back-off efficiency is achieved.

Original languageEnglish (US)
JournalIEEE Microwave and Wireless Components Letters
StateAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Back-off efficiency
  • Broadband
  • Broadband amplifiers
  • Dispersion
  • Doherty power amplifier
  • Impedance
  • Non-Foster
  • Quadrature Hybrid
  • Semiconductor device measurement
  • SiGe
  • Silicon germanium
  • Tuners
  • Wireless communication
  • mm-wave


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