Electronics and Communications in Japan (Part I Communications) · 1996 · 55 citations · 9 references
EngineeringElectrical EngineeringCircuit TheoryMicroelectronicsPower ElectronicsHigh-frequency Power ConversionPower AmplifiersResonant CircuitsClass E AmplifiersClass E Power AmplifiersHarmonicsPower Amplifier DesignPower Conversion EfficiencyPower OutputRadio Frequency Power AmplifiersSeries Resistance
Abstract A method for designing an amplifier that does not need an RF choke coil is proposed. This is accomplished by adding a shunt capacitor to a class E amplifier with a shunt inductor; this creates class E switching where higher harmonics are induced in the inductor‐fed input waveform. A design method is derived by performing an analysis of the circuit assuming load current is sinusoidal. Because the switch current is smaller than that of conventional class E amplifiers (with the same output power), the losses due to the series saturation resistance of the switch device are greatly reduced for the proposed amplifier. A 96‐percent RF conversion efficiency for 2 W of output power was obtained in experiments using a 2‐MHz switch using the proposed design.
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