Advanced RF Power Amplifier Techniques

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$67,987.00
Award Year:
2005
Program:
SBIR
Phase:
Phase I
Contract:
N00164-05-C-6095
Award Id:
75219
Agency Tracking Number:
N051-073-0273
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
8130 Boone Blvd., Suite 500, Vienna, VA, 22182
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
107928806
Principal Investigator:
Pei-hwa Lo
Principal Engineer
(703) 448-1116
phl@isl-inc.com
Business Contact:
J. Doss Halsey
Vice President
(703) 448-1116
halsey@islinc.com
Research Institute:
n/a
Abstract
The power added efficiency of current power amplifiers is often adversely impacted by the linearity requirement. This is especially true for many modern communication signals that have high Peak to Average (PAR) ratio. Although advanced power amplifier linearization techniques such as adoptively controlled feed-forward technologies, analog and digital pre-distortion techniques and Doherty amplifier structures improve efficiency, they still fall short of desired advanced power amplifier efficiency requirements (greater than 60% for full power applications). To accomplish the efficiency and linearity requirements for the advanced power amplifier, an innovative "constant envelope" signal decomposition technique is proposed. The proposed technique is applicable to all signal formats and allows the final stage power transistors to operate in Class B or Class C with minimum (less than 1 dB) back off from the 1 dB compression point. With the advance of high speed digital technologies, the proposed advanced power amplifier will have wide instantaneous (at least 6 MHz) and operational bandwidth (greater than 80 MHz). This advance power amplifier does not require any trade-off between efficiency and linearity. This proposal describes the approach and details behavior modeling techniques that allow accurate performance predictions for various waveform applications.

* information listed above is at the time of submission.

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