| 摘要 |
PROBLEM TO BE SOLVED: To provide a hysteresis comparator circuit which can reduce the circuit scale more. SOLUTION: The hysteresis comparator circuit 100 includes a constant current source, a variable resistance circuit which outputs an output voltage according to a voltage drop caused by a constant current, a comparator having an input terminal connected with an inverted input terminal and a non-inverted input terminal connected with a first contact of a constant current source and a variable resistance circuit, comparing an input signal to the inverted input terminal with a reference voltage at the first contact input to the non-inverted input terminal and outputting a voltage according to the comparison result, and a switch circuit. The switch circuit switches the resistance of the variable resistance circuit to a first resistance when the non-inverted output of the comparator includes a "Low" level, and switches the resistance of the variable resistance circuit to a second resistance lower than the first resistance when the non-inverted output of the comparator includes a "High" level. COPYRIGHT: (C)2009,JPO&INPIT
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