A high-efficiency, broadband CMOS power amplifier for cognitive radio applications

Pin Cheng Huang*, Zuo-Min Tsai , Kun You Lin, Huei Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


This paper presents a wideband power amplifier (PA) for the application of intelligent cognitive radios. Resistive feedback and transformer matching network are proposed in this PA design to enhance the broadband frequency response. The broadband load impedance match is realized using series stack topology. The limitation of stack PA in both GaAs and CMOS processes are discussed. A high-efficiency broadband PA in commercial 0.18 μm CMOS process with the best P1 dB of 20 dBm and PAE of 30% are demonstrated to verify the design concepts. This PA also shows the widest fractional bandwidth performance among CMOS PAs below 10 GHz.

Original languageEnglish
Article number5613966
Pages (from-to)3556-3565
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12 PART 1
StatePublished - 1 Dec 2010


  • CMOS
  • cognitive radio (CR)
  • monolithic micro wave integrated circuit (MMIC)
  • stack PA
  • stacked amplifier
  • wideband power amplifiers (PAs)

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