Advanced RF Power Amplifier Techniques

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00164-05-C-6095
Agency Tracking Number: N051-073-0273
Amount: $97,556.00
Phase: Phase I
Program: SBIR
Awards Year: 2005
Solicitation Year: 2005
Solicitation Topic Code: N05-073
Solicitation Number: 2005.1
Small Business Information
8130 Boone Blvd., Suite 500, Vienna, VA, 22182
DUNS: 107928806
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Pei-hwa Lo
 Principal Engineer
 (703) 448-1116
 phl@isl-inc.com
Business Contact
 J. Doss Halsey
Title: Vice President
Phone: (703) 448-1116
Email: halsey@islinc.com
Research Institution
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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