| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a charging/discharging circuit and a binarizing circuit, capable of keeping the amplitude of an input signal compared to a binary threshold value constant even in demodulating an ASK (amplitude shift keying) signal using RSSI (received signal strength indicator). <P>SOLUTION: An ASK signal demodulated by an RSSI detector 17 is inputted into a peak hold circuit 23, the peak hold circuit 23 detects a peak value of an input signal inputted into a charging/discharging section 24, a clip circuit 22 clips a level not higher than a given value, from the peak value of the input signal inputted into the charging/discharging section 24, and the charging/discharging section 24 rapidly charges and discharges a capacitor C2 using the signal clipped in the clip circuit 22, thereby generating a reference voltage Vref used as a threshold value of a comparator 27. <P>COPYRIGHT: (C)2010,JPO&INPIT |
