| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna driver capable of avoiding damage of a switching device by suppressing a through-current, realizing miniaturization by reducing number of circuit elements, and prolonging life of a resistor for limiting a current flowing an antenna circuit.SOLUTION: An antenna driver 100, for transmitting a signal from an antenna A by switching direction of a current flowing through an antenna circuit 10, includes: an antenna connection point 4 at which the other end of the antenna circuit 10, whose one end is connected to a first ground terminal G1, is connected; an FET1 connected between a power supply terminal B and the antenna connection point 4; an FET2 connected between the antenna connection point 4 and a second ground terminal G2; a control part 5 for controlling alternate switching of on-off states of the FET1 and the FET2; a first current limiting resistor R4 connected in series to the FET1 between the power supply terminal B1 and the antenna connection point 4; and a second current limiting resistor R5 connected in series to the FET2 between the antenna connection point 4 and the second ground terminal G2, where the values of current limiting resistors R4 and R5 are chosen identical. |
