| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved RF power amplifier capable of directly driving a switching transistor(TR). SOLUTION: An RF oscillator 20' supplies an RF signal showing the RF period of fixed frequency and constituting each positive pulse of a train of an RF pulse of a rectangular wave having fixed size and fixed width. The RF pulse is supplied to a one-shot circuit 200 and supplied to a 2nd one-shot circuit 240 through an inverter 202. These RF pulses are converted into rectangular wave signals of bridge phase A, or B and supplied to plural power amplifiers PA1 to PAN. The signals of the bridge phase A or B have inter-pulse dead time DT and these phases are different from each other by 18 deg.. Each of the amplifiers PA1 to PAN has a MOSFET TR and a buffer amplifier of a driving circuit. Power is supplied from a synchronizing isolation RF driving power supply (SIPS) to each amplifier.
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