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Class DE high-efficiency tuned power amplifier

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6 Author(s)
Koizumi, H. ; Dept. of Electr. Eng., Keio Univ., Yokohama, Japan ; Suetsugu, T. ; Fujii, M. ; Shinoda, K.
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A new type of high-frequency high-efficiency tuned power amplifier is proposed, analyzed and verified experimentally. It is called a Class DE tuned power amplifier because its circuit topology is very similar to that of the conventional Class D amplifier and the operation of each switch satisfies the Class E switching conditions when the switch turns on. Class E switching conditions are achieved by providing a shunt capacitor for each switch and realizing a dead-time between the switch-on-times. These conditions take into account that the amplifier operates at higher frequency than the conventional Class D amplifier. The switch voltage stress has kept on the same level to the conventional Class D amplifier. The measured efficiency was over 96% at 1 MHz

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:43 ,  Issue: 1 )