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Multi-band high efficiency power amplifier


Achieving high efficiency power amplification over multi- octave RF bandwidths pose many design challenges. Conventional design techniques do not support high efficiency operation since use of distributed matching circuits and/or multiplexing several power amplifiers incur non-optimal matching environments or high output losses. A new design approach is discussed whereby using the latest Gallium Nitride transistor technology and leveraging a Class E circuit environment, multiple electronically switched output networks are provided to the RF transistor providing high efficiency operation over multi-octave RF bandwidths. Two electronic switching elements are considered including PIN diodes and RF transistors. Using commercially available components, measurements are conducted on a physical prototype using PIN diode switch elements demonstrating typical efficiencies of 50% over two octaves bandwidth and at frequencies up to 2.4GHz

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