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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 8, AUGUST 1999 1471 High-Efficiency Power Amplifier Using Dynamic
 

Summary: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 8, AUGUST 1999 1471
High-Efficiency Power Amplifier Using Dynamic
Power-Supply Voltage for CDMA Applications
Gary Hanington, Student Member, IEEE, Pin-Fan Chen, Student Member, IEEE, Peter M. Asbeck, Senior Member, IEEE,
and Lawrence E. Larson, Senior Member, IEEE
Abstract-- Efficiency and linearity of the microwave power
amplifier are critical elements for mobile communication systems.
This paper discusses improvements in system efficiency that are
obtainable when a dc­dc converter is used to convert available
battery voltage to an optimal supply voltage for the output RF
amplifier. A boost dc­dc converter with an operating frequency
of 10 MHz is demonstrated using GaAs heterojunction bipolar
transistors. Advantages of 10-MHz switching frequency and as-
sociated loss mechanisms are described. For modulation formats
with time-varying envelope, such as CDMA, the probability
of power usage is described. Gains in power efficiency and
battery lifetime are calculated. An envelope detector circuit with
a fast feedback loop regulator is discussed. Effects of varying
supply voltage with respect to distortion are examined along with
methods to increase system linearity.

  

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

 

Collections: Engineering