Improvement of efficiency and linearity of a harmonic-control amplifier by envelope controlled bias voltage

Smely, D.; Ingruber, B.; Wachutka, M.; Magerl, Gottfried

doi:10.1109/mwsym.1998.700699

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Changing the Duty Cycle1

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“…This can be used to accommodate the envelope and power variations in a polar transmitter, by changing the amplifier's threshold voltage. Implementations exist with discrete steps as well as continuous change (Yang et al, 1999;Cijvat et al, 2008;Smely et al, 1998). A major advantage of these strategies is that no DC-DC converter is necessary; A disadvantage is that linearity may be worse compared to an amplifier where the supply voltage is changed, possibly resulting in tougher requirements for digital predistortion.…”

Section: Changing the Duty Cyclementioning

confidence: 99%