Method and apparatus for increasing the efficiency of low...

Details Method and apparatus for increasing the efficiency of low... Method and apparatus for increasing the efficiency of low...

2011-03-01

2011-03-01

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter

Including tuning

C455S127500

Reexamination Certificate

active

07899417

ABSTRACT:
The present invention is directed to a method for reducing the current consumption and increasing the efficiency of an RF power amplifier (PA), while maintaining the output power. The desired output power of the PA is determined and for each level of the desired output power, the load that is connected to the output stage of the PA is tuned to essentially match the output impedance of the output stage to provide maximal gain. By doing so, the dynamic RF load line has a slope that causes it to intersect with the drain-source (or emitter-collector, in case of a bipolar transistor) voltage, across the output stage, at a value that corresponds to the voltage swing required to provide the desired output power.

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Cripps, C. Steve, “RF Power Amplifiers for Wireless Communications”, Artech House, 1999.

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