| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress reduction of a terminal voltage boosted due to an increase of a gate leak current even when a large power is transmitted when an ambient temperature is high, and to improve a harmonic distortion characteristic. <P>SOLUTION: Upon transmission, a step-up voltage V1 obtained by a step-up circuit 21 is applied to a gate of a first switch element 31 by a decoder circuit 22. On the other hand, 0V is applied to the gate of a second switch element 32, and the first switch element 31 becomes conductive and the second switch element 32 becomes non-conductive. Further, a third switch element 33 becomes conductive, and a diode 39 is set to a reverse-bias state. Therefore, even a gate leak current of the second switch element 32 increases, the reduction of the boosted terminal voltage can be avoided. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
