A Balanced Distributed Cascode Power Amplifier With an Integrated Chebyshev Load Balancer for Full-Duplex Wireless Operation

Itamar Melamed, Dror Regev, Nimrod Ginzberg, Rani Keren, Emanuel Cohen

Research output: Contribution to journalArticlepeer-review

Abstract

This work proposes a fully integrated transmitter front end based on a balanced distributed cascode power amplifier (BDC-PA) and a passive second-order reconfigurable reflective self-interference cancellation (SIC) filter for full-duplex wireless applications. The balanced topology provides inherent passive transmit&#x2013;receive (TX&#x2013;RX) isolation complemented by the passive SIC filter, which accounts for the signal, noise, and nonlinearity components of the direct TX&#x2013;RX leakages and the reflections from a commercial Wi-Fi antenna. A digital cancellation technique is used to enhance the overall cancellation. A front-end chip prototype fabricated in TSMC&#x2019;s 65-nm CMOS process operating between 5 and 6 GHz and occupying the area of 1.2 mm<inline-formula> <tex-math notation="LaTeX">$^2$</tex-math> </inline-formula> achieves 19.5-dBm <inline-formula> <tex-math notation="LaTeX">$P$</tex-math> </inline-formula>sat with 31% peak PAE, 17-dBm OP1dB, and 8&#x2013;10-dB RX noise figure (NF). The analog SIC achieves 40 dB of TX&#x2013;RX isolation, and an overall cancellation of 78 dB is observed using the digital algorithm. The TX achieves an error-vector magnitude (EVM) of <inline-formula> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula>30 dB at 10-dB power backoff using a 20-MHz Wi-Fi OFDM signal without DPD.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
DOIs
StateAccepted/In press - 2024

Keywords

  • Antenna measurements
  • Cascode power amplifier
  • Filters
  • full duplex
  • Impedance matching
  • Interference cancellation
  • Noise
  • power amplifier
  • Reflection coefficient
  • Reflector antennas
  • self-interference cancellation
  • Volterra series

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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