| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce current consumption at suspending antenna operation while ensuring stability of antenna driving.SOLUTION: An antenna driver 10 includes an antenna driving circuit 100 for generating driving currents I1 to I6 for a transmission antenna part 20, a power supply circuit 200 for generating an output voltage VS from an input voltage VB and supplying the output voltage to the antenna driving circuit 100, and a logic circuit 300 for controlling the antenna driving circuit 100 and the power supply circuit 200. The power supply circuit 200 provides a function for temporarily disabling current feedback control, and for performing voltage feedback control using a reference value immediately before suspension of driving the transmission antenna part 20, the reference value is a soft-start voltage SS according to a peak signal SHO immediately before the suspension, when resuming driving of the transmission antenna part 20.</p> |
