Even harmonic resonant class E tuned power amplifier without RF choke
✍ Scribed by Minoru Iwadare; Shinsaku Mori; Kazunaga Ikeda
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 459 KB
- Volume
- 79
- Category
- Article
- ISSN
- 8756-6621
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✦ Synopsis
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.