envelope tracking of a radio frequency amplifier for long term evolution using a three-level class-g modulator
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ID: 153973
2013
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Abstract
In this contribution, efficiency enhancement of a radio frequency (RF) power
amplifier (PA) for Long Term Evolution (LTE) base stations using envelope
tracking is investigated. The dynamically adapted drain bias voltage is
provided by a three-level class-G modulator. The potential of this bias
modulator is demonstrated with a class AB PA built in gallium nitride (GaN)
technology with an operation frequency of 2.75 GHz, a maximum
output power of 41 dBm and a peak power-added efficiency (PAE) of
60%. When driven by an LTE signal with a bandwidth of
20 MHz, overall system efficiency can be increased from 17%
with a constant supply voltage up to 29% with envelope tracking. This is
accompanied by a reduction of linearity. Adjacent channel leakage ratio
(ACLR) decreases by 10 dB in the first and by 18 dB
in the second adjacent channel, respectively. Error vector magnitude (EVM)
increases from 9% up to 29%.
| Reference Key |
brckle2013advancesenvelope
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|---|---|
| Authors | ;A. Bräckle;L. Rathgeber;F. Siegert;S. Heck;M. Berroth |
| Journal | neuropsychiatrie : klinik, diagnostik, therapie und rehabilitation : organ der gesellschaft osterreichischer nervenarzte und psychiater |
| Year | 2013 |
| DOI |
10.5194/ars-11-207-2013
|
| URL | |
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