Linearized saturation amplifier with bidirectional control (LSA-BC) for digital mobile radio

Kohji Chiba, Toshio Nojima, Shigeru Tomisato

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

10 Citations (Scopus)

Abstract

The design and performance of the LSA-BC, a novel power amplifier, are presented. A linear amplifier with the high efficiency of a switching-mode saturation amplifier can be realized. A high-efficiency GaAs FET is roughly linearized by dynamically varying its drain DC voltage with a high-efficiency variable-output DC-DC converter. A negative envelope feedback is utilized to compensate for the residual. The circuit construction is simple enough for use in the portable subscriber units of a digital mobile radio system. A 1.5-GHz-band 1-W LSA-BC was constructed to determine its performance with 32-kb/s roll-off QPSK (quadrature phase-shift keying). As a result, a 40% total efficiency is achieved as well as a stable third-order intermodulation distortion of -50 dB to the signal level.

Original languageEnglish
Title of host publicationIEEE Global Telecommunications Conference and Exhibition
PublisherPubl by IEEE
Pages1958-1962
Number of pages5
Volume3
ISBN (Print)0879426322
Publication statusPublished - 1990
Externally publishedYes
EventIEEE Global Telecommunications Conference & Exhibition Part 3 (of 3) - San Diego, CA, USA
Duration: Dec 2 1990Dec 5 1990

Other

OtherIEEE Global Telecommunications Conference & Exhibition Part 3 (of 3)
CitySan Diego, CA, USA
Period12/2/9012/5/90

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Chiba, K., Nojima, T., & Tomisato, S. (1990). Linearized saturation amplifier with bidirectional control (LSA-BC) for digital mobile radio. In IEEE Global Telecommunications Conference and Exhibition (Vol. 3, pp. 1958-1962). Publ by IEEE.