| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a receiving circuit of a reader/writer device capable of demodulating a signal received from an IC card normally even when there is a variance in properties of components such as a transistor in its receiving part. <P>SOLUTION: The reader/writer device 20 comprises a bias adjusting part 21 consisting of a first bias adjusting part 21a for adjusting a bias voltage of a signal outputted from a first amplifier 16a and a second bias adjusting part 21b for a signal outputted from a second amplifier 16b; a first direct current detecting part 22a for detecting a voltage of a DC component of a signal outputted from the first amplifier 16a; and a second direct current detecting part 22b for detecting a voltage of a DC component of a signal outputted from the second amplifier 16b. <P>COPYRIGHT: (C)2007,JPO&INPIT |
