TRANSMISSION CIRCUIT FOR BIAS CONTROL OF POWER AMPLIFIER

摘要

<P>PROBLEM TO BE SOLVED: To provide a transmission circuit that is capable of switching a bias circuit without allowing a power amplifier to enter a non-bias state. Ž<P>SOLUTION: A first bias circuit 24 supplies a first bias signal to a power amplifier 17. A second bias circuit 25 supplies a second bias signal to the power amplifier 17. A first delay circuit 22 delays switching of an operation of the first bias circuit 24 for a first delay time. A second delay circuit 23 delays switching of an operation of the second bias circuit 25 for a second delay time. The first bias circuit 24 and the second bias circuit 25 are both simultaneously operated for a prescribed time period, in order to prevent a transistor for amplification 171 from entering a non-bias state when switching an operation mode of the power amplifier 17. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž