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High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications

G. Hanington, Pin-Fan Chen, P.M. Asbeck, L.E. Larson
1999 IEEE transactions on microwave theory and techniques  

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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 dc-dc converter is used to convert available battery voltage to an optimal supply voltage for the output RF amplifier. A boost dc-dc converter with an operating frequency of 10 MHz is demonstrated using GaAs heterojunction bipolar transistors. Advantages of 10-MHz switching frequency and associated
more » ... 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.
doi:10.1109/22.780397 fatcat:xyk6rmftqrcq3ff5aaqdvwkyxu
Citation

G. Hanington, Pin-Fan Chen, P.M. Asbeck, L.E. Larson. "High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications." IEEE transactions on microwave theory and techniques 47.8 (1999) 1471-1476