Linearization of CMOS triple cascode push-pull power amplifiers by second harmonic feedback

Kazuma Terajima, Kenichi Fujii, Takuji Sonoda, Tadashi Takagi, Eita Nakayama, Suguru Kameda, Noriharu Suematsu, Kazuo Tsubouchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A linearity enhancement technique to a CMOS triple cascode push-pull power amplifier (PA) by second harmonic feedback has been proposed. The Second harmonic feedback is optimized to improve linearity based on the concept that the linearity is depend on the second harmonic feedback amplitude and phase. In order to feed second harmonics back to the push-pull PAs, we adopt a balun with a branching filter fabricated by using multi-layered organic substrates. The PA was fabricated in 0.18-μm CMOS process and was implemented on the balun by flip-chip connection. Because of the low breakdown voltage of CMOS power transistors, triple cascode configuration was adapted. It has been demonstrated that using second harmonic feedback, PAE and output power with a wideband code division multiple access (WCDMA) modulated signal are improved by 5.3% and 2.5dB respectively at adjacent channel leakage power ratio (ACLR) of -39dBc, and it has been demonstrated PAE of 28.8% and output power of 24.5dBm, respectively.

Original languageEnglish
Title of host publication2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages107-109
Number of pages3
ISBN (Electronic)9784902339314
Publication statusPublished - 2014 Mar 25
Event2014 Asia-Pacific Microwave Conference, APMC 2014 - Sendai, Japan
Duration: 2014 Nov 42014 Nov 7

Publication series

Name2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014

Other

Other2014 Asia-Pacific Microwave Conference, APMC 2014
CountryJapan
CitySendai
Period14/11/414/11/7

Keywords

  • Adjacent channel leakage power ratio (ACLR)
  • Balun
  • CMOS power amplifiers (PA)
  • Harmonic feedback
  • Linearity
  • Planar balun
  • Wideband code division multiple access (WCDMA)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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