| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent deterioration of characteristic by switching the current of an auto bias circuit by a switching circuit plurally dividing the inputting level of an inputted fundamental wave and formed of plural stages of window comparators and analog switches corresponding to the division so as to improve the multiplying efficiency of a multiplier. SOLUTION: A frequency multiplier of a field-effect transistor(FET) 1 or a high electron mobility transistor(HEMT) 2 is divides the inputted level of the inputted fundamental wave, and a switch circuit formed of plural stages of window comparators 4 and the analog switches 5 corresponding to the division is provided to switch a resistor R3i. A potential VGG is fluctuated according to the input level of the fundamental wave and the inputted level of the fundamental wave can be divided to about three kinds of ranges according to the fluctuation. Since nearly optimal multiplying efficiency corresponding to each level of it is set, the resistor R3i is switched by the circuit window comparator 4 and the analog switch 5 according to it.</p> |
