Abstract-Single-switch inverters such as the conventional class E inverter are often highly load sensitive, and maintain zero-voltage switching over only a narrow range of load resistances. This paper introduces a design methodology that enables rapid synthesis of class E and related single-switch inverters that maintain ZVS operation over a wide range of resistive loads. We treat the design of Class-E inverters for variable resistance operation and show how the proposed methodology relates to circuit transformations on traditional class E designs. We also illustrate the use of this transformation approach to realize  2 inverters for variable-resistance operation.The proposed methodology is demonstrated and experimentally validated at 27.12 MHz in a class E and  2 inverter designs that operate efficiently over 12:1 load resistance range for an 8:1 and 10:1 variation in output power respectively and a 25 W peak output power.

Abstract-A lossless multi-way power combining and outphasing system has recently been proposed for highfrequency inverters and power amplifiers that offers major performance advantages over traditional approaches. This paper presents outphasing control strategies for the proposed power combining system that enable output power control through effective load modulation of the inverters. It describes a straightforward power combiner design methodology and enumerates various possible topological combiner implementations. Moreover, this work presents the first-ever experimental demonstration of the proposed outphasing system. The design of a 27.12 MHz, four-way power combining and outphasing system is described and used to experimentally verify the power combiner's characteristics. The proposed outphasing law is shown to be effective in controlling the output power over a 10 W to 100 W (10:1) power range.Index Terms-Outphasing, phase-shift control, LINC, power combining, Chireix combiner, RF power amplifier (RF PA).

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Abstract-A lossless multi-way power combining and outphasing system has recently been proposed for highfrequency inverters and power amplifiers that offers major performance advantages over traditional approaches. This paper presents outphasing control strategies for the proposed power combining system that enable output power control through effective load modulation of the inverters. It describes a straightforward power combiner design methodology and enumerates various possible topological combiner implementations. Moreover, this work presents the first-ever experimental demonstration of the proposed outphasing system. The design of a 27.12 MHz, four-way power combining and outphasing system is described and used to experimentally verify the power combiner's characteristics. The proposed outphasing law is shown to be effective in controlling the output power over a 10 W to 100 W (10:1) power range.Index Terms-Outphasing, phase-shift control, LINC, power combining, Chireix combiner, RF power amplifier (RF PA).