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

Zheng Liu, Yiming Yu, Kaushik Sengupta

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


This letter presents a simultaneous 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 6 dB back-off with 18.5-21.5 dBm Psat and peak gain of 18.5 dB. It supports 6 Gbps 64 QAM signal with-26.5 dB/-28.3 dBc EVM/ACLR at average Pout/PAE of 14.6 dBm/14.6% at 54 GHz. To the best of the authors' knowledge, this work achieves highest bandwidth among silicon-based mm-wave power amplifiers (PAs) where higher than class-B back-off efficiency is achieved.

Original languageEnglish (US)
Article number9381286
Pages (from-to)760-763
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number6
StatePublished - Jun 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Back-off efficiency
  • Doherty power amplifier (PA)
  • SiGe
  • broadband
  • mm-wave
  • non-Foster
  • quadrature hybrid


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