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A switching mode RF power amplifier that employs a narrowband filter directly connected to the output, is presented. The efficiency improvement compared to a conventional class B PA and the influence of a transmission line between the PA and this filter is investigated. These techniques are illustrated by circuit simulation and verified by measurements. It is shown how the transmission line between...
This paper presents a novel space-vector current-control strategy for three-phase neutral-point (NP)-clamped inverters. The main task of this control technique is to force the actual current vector to reach the reference current vector. This original strategy consists in defining three circular hysteresis bands around the error vector. Then, according to the location of this error vector, a selection...
Some important aspects of CMOS RF PA design are discussed. Improving efficiency at circuit level is discussed first, as well as the challenge to achieve high output power in low-voltage CMOS. Next, some PA architectures are reviewed. It will be shown how signal processing can be used to improve the efficiency of a CMOS PA.
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