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Despite the integrability and reconfigurability offered by fully digital wireless transmitters, their efficiency is still low, and no effective ways exist to diagnose and predict its degradation at higher back-off powers. Having found that it is the linear dependence of the switching losses with the output amplitude plus the inevitable constant losses that cause efficiency degradation at higher back-offs,...
Limit-cycle or self-oscillating power amplifiers (SOPAs) are seen as an effective and simple option to achieve linear yet efficient power amplification. Unfortunately, they suffer from unfiltered switching noise, also known as ripple, whose amplitude increases for progressively lower self-oscillating frequency. Moreover, such self-oscillating frequency changes with the input signal and its dependency...
Limit-cycle or self-oscillating power amplifiers (SOPAs) are seen as a compact option to achieve efficient yet linear amplification of either complete RF signals or only their base-band envelopes. Unfortunately, one of their undesired drawbacks is that their self-oscillating frequency, and thus available bandwidth, is reduced when a significant propagation delay exists in the feedback loop, typically...
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