| 摘要 |
PURPOSE:To obtain a simple circuit with highly accurate hysteresis characteristics by poviding the 1st differential comparator producing an output with an input voltage being the 1st discriminating voltage or over and the 2nd differential comparator producing an output with an input voltage being the 2nd discriminating voltage or below lower than the 1st discriminating volt age. CONSTITUTION:The 1st reference potential V1 from a potential generating source 1 is inputted to a non-inverting input terminal 5 of a differential amplifier 4 and the 2nd reference potential V2 from a potential generating source 2 is inputted to an inverting input terminal 10 of a differential amplifier 8. In the hysteresis circuit as above, an output of an RS flip-flop circuit 12 is not inverted until an input potential VIN reaches the 1st reference potential V1 from the lowest potential, and when the input potential VIN exceeds the 1st reference potential V1, the output of the RS flip-flop circuit 12 is inverted. In this case, an output inverted level of the differential amplifier 4 has only an error of the input offset voltage to the 1st reference potential V1 to eliminate the variance in manufacture.
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