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LOW_PASS_DIGITAL_FILTER

2017-02-23 03:24  
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LOW_PASS_DIGITAL_FILTER
Used to retrieve pulse train data from noisy signal line. Filtering is achieved with SN7400 quad two-input NAND gate, SN7413 dual four-input Schmitt trigger, two diodes, and two capacitors. One gate of SN7400 is used as inverter driving pulse delay operating on negative-going transition of input pignal. Other Schmitt trigger, diode, and capacitor provide delay on positive-going transition. Any additional pulses occurring during delaycirouit time-out resets delay time without affecting output.-T. H. Haydon. Low-Pass Digital Filter. EDN Magazine. Nov. 20. 1973. p 85.