| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bias control circuit that reduces power consumption while there is no input signal even if an amplifier for amplifying an input signal operates on a negative bias. <P>SOLUTION: The bias control circuit includes: a first switch section 11 for selecting whether or not to apply a first bias causing an amplification action of an amplifying element 2 for amplifying an input signal to the amplifying element 2; a second switch section 12 for selecting whether or not to apply a second bias lower than the first bias to the amplifying element 2; and a switching section 13 for controlling the first switch section 11 on and the second switch section 12 off when there is an input signal and controlling the first switch section 11 off and the second switch section 12 on when there is no input signal on the basis of a detection signal indicating whether there is an input signal. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
