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The generation of RF/microwave power is required not only in wireless communications, but also in applications such as jamming, imaging, RF heating, and miniature dc/dc converters. Each application has its own unique requirements for frequency, bandwidth, load, power, efficiency, linearity, and cost. RF power is generated by a wide variety of techniques, implementations, and active devices. Power amplifiers are incorporated into transmitters in a similarly wide variety of architectures, including linear, Kahn, envelope tracking, outphasing, and Doherty. Linearity can be improved through techniques such as feedback, feedforward, and predistortion.

-A new family of singlestage isolated power-factor corredors features fast regulation of the output voltage, one or two power switches operated in unison, a single control loop, and automatic shaping of the line current. We give topologies, steadystate analysis, design mnsiderations, and experimental results. TOPOLOGIES AND OPERATION A. TopologiesThe topologies of the members of the new family can be derived from the general structure shown in Figure 1.

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