Referenced Items are not available for this document.
This paper presents a novel adaptive power amplifier (PA) architecture for performing dynamic-load-modulation. For the first time, a dynamically-load-modulated PA design that achieves octave bandwidth, high power and high efficiency simultaneously is experimentally demonstrated. This PA design is based on a commercial GaN HEMT. The output matching scheme incorporates a broadband static matching for high-efficiency at the maximum power level and a wideband dynamic matching for efficiency enhancement at power back-offs. The impedance and frequency tunability is realized using silicon diode varactors with a very high breakdown voltage of 90 V. Experimental results show that a dynamic-load-modulation from maximum power to 10-dB back-off is achieved from 1 to 1.9 GHz, with a measured performance of ≈10-W peak power, ≈10-dB gain, 64%-79% peak-power efficiency, and 30%-45% efficiency at 10-dB power back-off throughout this band.
Published in:
Microwave Theory and Techniques, IEEE Transactions on
(Volume:60
,
Issue:
6
)
Date of Publication: June 2012
- Page(s):
- 1829 - 1839
- ISSN :
- 0018-9480
- INSPEC Accession Number:
- 12761161
- Digital Object Identifier :
- 10.1109/TMTT.2012.2189232
- Product Type:
- Journals & Magazines
- Date of Publication :
- 03 April 2012
- Date of Current Version :
- 25 May 2012
- Issue Date :
- June 2012
- Sponsored by :
- IEEE Microwave Theory and Techniques Society
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