A Zero-Voltage-Switching Contour-Based Outphasing Power Amplifier

A parallel class-E modified Chireix outphasing power amplifier (PA) that can maintain high efficiency across a wide output power range is presented. The architecture presented essentially implements a zero voltage switching (ZVS) contour-based PA using a modified Chireix outphasing structure. It uti...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2012-06, Vol.60 (6), p.1896-1906
Main Authors: Singhal, N., Haoxing Zhang, Pamarti, S.
Format: Article
Language:English
Subjects:
Capacitance
Dynamic range
Efficiency
Inductors
Microwaves
Modulation
Noise levels
Peak-to-average power ratio (PAR)
power amplifier (PA)
Power amplifiers
Power generation
Printed circuit boards
Printed circuits
Radio frequency
Shape
Voltage
Zero voltage switching
zero voltage switching (ZVS)
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Summary:A parallel class-E modified Chireix outphasing power amplifier (PA) that can maintain high efficiency across a wide output power range is presented. The architecture presented essentially implements a zero voltage switching (ZVS) contour-based PA using a modified Chireix outphasing structure. It utilizes the inherent load modulation present in the outphasing scheme and combines it with duty cycle modulation to satisfy ZVS conditions over a wide range of output powers. Thus, a ZVS contour-based PA is realized, and the amplifier maintains high efficiency for about 9-dB back-off of output power. Beyond the 9-dB range, simple outphasing is performed to extend the dynamic range up to about 30 dB. The proposed PA, implemented using discrete components on an FR4 printed circuit board, achieves a dynamic range of 30 dB with a peak power of 29 dBm and a peak drain efficiency of 65% at about 6-dB back-off from the peak output power at 100 MHz from a 3-V supply.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2012.2190747