| 摘要 |
PROBLEM TO BE SOLVED: To provide a window comparator capable of optionally setting two comparison voltages and operable even at a low power supply voltage. SOLUTION: The window comparator is configured with a first comparator circuit comprising: a first element 10 to which an input voltage is applied; a second element 12 to which a first reference voltage VH is applied; and a first constant current source 30 whose one terminal is connected to ground and making the sum of currents flowing to the first and second elements constant, and with a second comparator circuit comprising: a third element 24 to which the input voltage is applied; a fourth element 26 to which a second reference voltage VL set to a voltage lower than the first reference voltage is applied; and a second constant current source 32 whose one terminal is connected to ground; and a current mirror circuit to making proportion the sum ofcurrent which flowing to the third and fourth elements for the above-mentioned the current of the second element . A voltage across the second constant current source is used for an output VOUT. COPYRIGHT: (C)2004,JPO
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