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2480 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 49, NO. 12, DECEMBER 2001 Current-Mode Class-D Power Amplifiers for
 

Summary: 2480 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 49, NO. 12, DECEMBER 2001
Current-Mode Class-D Power Amplifiers for
High-Efficiency RF Applications
Hidenori Kobayashi, Member, IEEE, Jeffrey M. Hinrichs, and Peter M. Asbeck, Fellow, IEEE
Abstract--We show that current-mode class-D (CMCD) power
amplifiers can achieve high efficiency at RF frequencies. In
contrast with conventional voltage-mode class-D amplifiers, the
CMCD features "zero voltage switching," which eliminates the
output capacitance discharge loss. Experimental CMCD ampli-
fiers with 76.3% power-added efficiency (PAE) at 290-mW output
and 71.3% PAE at 870-mW output are demonstrated using GaAs
FETs at 900 MHz.
Index Terms--Analog circuits, MESFET power amplifiers,
power amplifiers, wireless communications.
I. INTRODUCTION
SWITCHING-MODE power amplifiers have the potential
for high efficiency, with drain efficiency theoretically
approaching 100% [1]. However, available transistors are not
ideal switches because of parasitic reactances, finite on-re-
sistance, and limited gain. Class-D amplifiers are popular

  

Source: Asbeck, Peter M. - Department of Electrical and Computer Engineering, University of California at San Diego

 

Collections: Engineering