| 摘要 |
PURPOSE:To provide an output of an accurate square wave not including an abnormal pulse even when noise signal is somewhat included in an input signal due to impedance mis-matching of a transmission line or the like. CONSTITUTION:Four comparators 1a-1d are used to compare an input signal with reference voltages obtained by dividing a power supply voltage with plural resistors R1-R5 thereby obtaining comparator outputs D1-D4 whose levels differ from each other. An arithmetic output section 2 comprising combinations of plural logic elements 3-9 changes an input logic discrimination level based on the comparator outputs D1-D4 depending on a preceding level path and obtains an output signal based on an input logic discrimination level subjected to change thereby preventing it that the output signal includes a noise signal or an abnormal signal due to the reflection on a transmission line. |
