| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform proper antenna drive according to usage states.SOLUTION: An antenna driving device 10 includes an antenna driving circuit 100 generating driving currents I1 to I6 for a transmission antenna 20; a power-supply circuit 200 generating an output voltage VS from an input voltage VB and supplying the output voltage VS to the antenna driving circuit 100; and a logic circuit 300 controlling the antenna driving circuit 100 and the power-supply circuit 200. The power-supply circuit 200 changes an output feedback mode according to directions from the logic circuit 300 so as to perform any one of voltage feedback control maintaining the output voltage VS to a constant value and current feedback control maintaining the driving currents I1 to I6 to a constant value.</p> |
