| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress a gain variation due to a temperature variation and a manufacturing variation. <P>SOLUTION: A power amplifier comprises: an amplifying circuit about which multiple amplifying units for amplifying a signal are connected in multiple stages; and a bias supplying circuit for supplying bias voltage to each amplifying unit. The bias supplying circuit comprises: a first bias circuit for controlling the bias voltage in a first mode to stabilize trans-conductance of the amplifying units; and a second bias circuit for controlling the bias voltage in a second mode to stabilize bias current of the amplifying units. The bias voltage of at least one amplifying unit of the multiple amplifying units can be controlled in the first mode, and the bias voltage of at least one of the rest of the multiple amplifying units can be controlled in the second mode. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
