A polar transmitter using a linear-assisted delta-modulation envelope-amplifier for WCDMA applications

Kazuaki Kunihiro, Kiyohiko Takahashi, Shingo Yamanouchi, Tomohisa Hirayama, Hikaru Hida, Shin Ichi Tanaka

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

7 Citations (Scopus)

Abstract

A polar transmitter using a new linear-assisted delta-modulation (LADM) envelope-amplifier has been developed for WCDMA applications. The LADM system is composed of a highly efficient switching block based on a 200-MHz-clock delta-modulator, which is implemented in a 0.18-μm CMOS IC, and a highly accurate linear block. In the LADM approach, the residual quantization noise and distortion of switching amplification are removed through the assistant linear process; thus, a sufficiently low ACPR of -45 dBc and a small EVM of 1.7% can be achieved without a pre-distortion technique. The developed polar transmitter nearly doubles the average efficiency in the 10- to 15-dB back-off region of class-AB PAs.

Original languageEnglish
Title of host publicationProceedings of the 36th European Microwave Conference, EuMC 2006
PublisherIEEE Computer Society
Pages137-140
Number of pages4
ISBN (Print)2960055160, 9782960055160
DOIs
Publication statusPublished - 2006 Jan 1
Event36th European Microwave Conference, EuMC 2006 - Manchester, United Kingdom
Duration: 2006 Sep 102006 Sep 12

Publication series

NameProceedings of the 36th European Microwave Conference, EuMC 2006

Conference

Conference36th European Microwave Conference, EuMC 2006
CountryUnited Kingdom
CityManchester
Period06/9/1006/9/12

Keywords

  • CMOS
  • Code division multiple access (CDMA)
  • Delta modulation
  • Polar transmitter
  • Power amplifiers

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

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  • Cite this

    Kunihiro, K., Takahashi, K., Yamanouchi, S., Hirayama, T., Hida, H., & Tanaka, S. I. (2006). A polar transmitter using a linear-assisted delta-modulation envelope-amplifier for WCDMA applications. In Proceedings of the 36th European Microwave Conference, EuMC 2006 (pp. 137-140). [4057766] (Proceedings of the 36th European Microwave Conference, EuMC 2006). IEEE Computer Society. https://doi.org/10.1109/EUMC.2006.281219