| 摘要 |
A wireless communication device includes a resistive-element-including RFIC and an antenna coil. The resistive-element-including RFIC includes an RFIC, a capacitive element, and resistive elements. The resistive elements and a portion of a circuit in the RFIC define a variable impedance circuit. The RFIC controls the impedance of a resistive circuit added to an antenna circuit in accordance with certain IO terminals set as output ports or input ports, thus obtaining a Q value of the antenna circuit in accordance with a communication speed. |
