Advanced RF Power Amplifier Techniques
Small Business Information
INFORMATION SYSTEMS LABORATORIES, INC.
8130 Boone Blvd., Suite 500, Vienna, VA, 22182
J. Doss Halsey
AbstractThe 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.
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