| 摘要 |
<p>PROBLEM TO BE SOLVED: To correct an idle current flowing to respective power amplifier circuits to an optimum value at all times by correcting the bias voltage of the power amplifier circuit based on the detected result of the size of the idle current flowing at the time of a correction operation. SOLUTION: The power amplifier circuit is constituted of a transistor 23, a high frequency load 24 and resistors 19-21. This idle current correction circuit is constituted of switching transistors 6 and 7, the resistor 10, voltage drop detection parts 11-14 and a processing circuit 15. Then, the supply route of the idle current is switched at the time of the correction operation and at the time of a normal operation. Thus, whether or not the idle current flowing to the respective power amplifier circuits is shifted from the optimum value is detected and it is automatically corrected by control. Thus, the idle current is optimized compared to the case of fixing a correction amount to the average value of element deviations and handling time and operation time are reduced compared to a manual operation.</p> |
