Improvement of power amplifier efficiency by reactive Chireix combining, power back-off and differential phase adjustment

An interesting effect of output power back-off (OPBO) efficiency improvement is presented which is present if 2 power amplifiers (PA) utilizing a reactive output Chireix coupling are combined with input power back-off and differential phase adjustment for maximum efficiency peaking. The capability o...

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Bibliographic Details
Main Authors: Gerhard, W., Knoechel, R.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
basestation
Chireix
Differential amplifiers
efficiency
Impedance
Laboratories
LDMOS
LINC
Microwave amplifiers
Multiaccess communication
outphasing
Phase modulation
Power amplifiers
Power generation
Power measurement
rf power amplifier
WCDMA
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Description
Summary:An interesting effect of output power back-off (OPBO) efficiency improvement is presented which is present if 2 power amplifiers (PA) utilizing a reactive output Chireix coupling are combined with input power back-off and differential phase adjustment for maximum efficiency peaking. The capability of significant efficiency improvement at power backoff is demonstrated and validated by means of simulations and measurements. The new design method delivers a power added efficiency (PAE) of 48% at 6dB OPBO and 35% at 10dB OPBO for a 25.7W Si-LDMOS PA at 2.14 GHz for a WCDMA basestation application
ISSN:0149-645X
DOI:10.1109/MWSYM.2006.249783