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The class E high-efficiency transistor tuned power oscillator, based on the class E power amplifier, is presented. Theoretical conditions for optimum operation of the oscillator are formulated. A new feedback-loop circuit is proposed and a corresponding oscillator design procedure is given. Experimental results show that the collector-voltage and collector-current waveforms and the collector efficiency of the oscillator are the same as in the class E amplifier with the same transistor and operating at the same frequency. The measured collector efficiency was over 95 percent with 3 W output at 2 MHz. The proposed oscillator is especially applicable at high frequencies because it minimizes the power dissipated during the transistor off-to-on transition, even if the switching time is an appreciable fraction of the signal period.
Date of Publication: Apr 1981