| 摘要 |
PURPOSE:To eliminate noise without causing the reduction in fan-out, reduction in the mount density and any cost-up by providing a delay circuit outputting plural delay signals and a logic circuit taking majority decision logic of plural delay signals and giving an output. CONSTITUTION:A delay circuit 10 gives delays of '0', t and t2 to a digital input signal to generate three delay signals. A logic circuit 12 takes majority decision logic of the three signals. For example, suppose that noise is superimposed on, e.g., a digital signal and the signal level is changed momentarily to a high level, then the high level is given to the logic circuit 12 as it is and delayed by t and t2 the result is given to the logic circuit 12. As a result, when one of inputs to the logic circuit 12 is at a high level, the other two inputs are at a low level without fail. Thus, the majority decision logic results in a low level. The noise is eliminated from the input signal as the output of the logic circuit 12. |
