| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna driver capable of increasing transmission speed of a transmission signal from an antenna while suppressing increase in an operation load.SOLUTION: An antenna is driven by controlling duty ratios of drive signals Sa to Sd in a pulse shape for applying antenna drive voltage to the antenna. The duty ratios of the drive signals Sa to Sd are set to be 50% in a startup period T1 and are set to be 25% in a constant period T2 succeeding the startup period, in an ON period of an information signal. |
