| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LF receiving circuit capable of demodulating a received modulation signal without using an HPF (High Pass Filter). <P>SOLUTION: In order that the level of a signal representing data of "0" of an amplification signal outputted from an amplifier (gain amplifier) 111 reliably comes to be an "L" level, among the "L" level and an "H" level, an offset adjusting circuit 21 adjusts offset between the level of an ASK signal and the level of a comparison reference signal. Although, in an LF receiving circuit 10, the HPF is not used so that the level of a signal portion representing "0" data in the amplification signal reliably comes to be the "L" level, the amplification signal outputted from the gain amplifier 111 can be directly inputted in a low pass filter (LPF) 31 for demodulating a modulation signal. <P>COPYRIGHT: (C)2013,JPO&INPIT |
