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This paper presents a new Class-E power amplifier (PA) with a -matching output network. The PA is targeted at low output power wireless applications. Analytical formulae are derived to aid the PA design, characterization and optimization. A fully integrated 2.4-GHz PA for short distance communications has been implemented in 0.13 CMOS technology to verify the proposed design method...
This paper presents a single chip class D audio power amplifier realized in a 0.35 mum CMOS technology. This chip consists of a high-linear single-loop feed-forward Sigma-Delta modulator with three level quantizer and a full H-bridge output stage. The three-level quantizer effectively reduces the switching activity of the output stage, especially when the input signal amplitude is low, hence improves...
Polar transmitters are often employed in communication systems to obtain high linearity and high efficiency. In this paper, we study and analyze the performance of polar transmitters using delta and delta-sigma modulations. It is found that delta modulation is subject to the variation of the signals, and shows relatively poor linearity compared to delta- sigma modulation in the polar transmitters.
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