Abstract

A combined class-AB and switch-mode regulator based supply modulator with a masterslave architecture achieving wide bandwidth and low ripple is presented. Low frequency content of the envelope waveform is provided by a synchronous-rectifier based switch-mode power supply while high frequency content is provided by a rail-to-rail class-AB amplifier. A wide range, low loss output current sensing circuit is used at the class-AB amplifier output, canceling the ripple due to switch-mode power supply and extending overall modulator bandwidth. The proposed regulator is designed and fabricated on a 0.35 μm CMOS process. The combined regulator achieves a maximum efficiency of 82% and an IMD3 of 65 dBc at 10 MHz for 16 dBm output power. The regulator achieves a frequency range up to 10 MHz with less than 0.2% envelope tracking error, making this PA regulator suitable for CDMA applications.

Original languageEnglish (US)
Article number4684656
Pages (from-to)2809-2819
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume43
Issue number12
DOIs
StatePublished - Dec 1 2008

Keywords

  • CDMA
  • Envelope tracking
  • PA regulator
  • Power amplifier
  • Supply modulator

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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