| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a reception circuit, with which the interruption detected result of a target clock is applied to transmission equipment when a transmission line signal is erroneously inputted, in simple configuration. SOLUTION: A 1.5M resonance circuit 11 extracts the frequency component of the transmission line signal near 1.5Mbps and transmits it to a comparator 13 and a waveform shaping circuit 14. A 2M resonance circuit 12 extracts the frequency component near 2Mbps and transmits it to the comparator 13. The waveform shaping circuit 14 generates the input clock of transmission equipment by shaping the waveform of an output signal from the 1.5M resonance circuit 11. On the other hand, the comparator 13 detects the interruption of the clock at 1.5Mbps by comparing the levels of output signals from the 1.5M resonance circuit 11 and 2M resonance circuit 12 and comparing a reference voltage Vr with the level of the output signal from that 1.5M resonance circuit 11.</p> |
