Patent ID: 6859040
Filing Date: 2005-02-22
Classification: G01R

Abstract:
1. A voltage detecting circuit comprising: a current mirror circuit having at least one input terminal and at least one output terminal; a first constant current circuit with an output terminal connected to the input terminal of the current mirror circuit; a first conductivity type enhancement MIS transistor having a gate electrode, a drain electrode, and a source electrode, the drain electrode being connected to the output terminal of the current mirror circuit, and the source electrode being connected to a first power supply potential; a second constant current circuit with an output terminal connected to the gate electrode of the first conductivity type MIS transistor; a second conductivity type enhancement MIS transistor including a gate electrode, a drain electrode, and a source electrode, the drain electrode being connected to the output terminal of the second constant current circuit, the source electrode being connected to a second power supply potential, and the gate electrode being connected to the first power supply potential; an amplifying circuit including at least one input terminal and at least one output terminal, the input terminal being connected to the output terminal of the current mirror circuit, and the output terminal being a terminal for outputting a voltage detection output of the power supply potential.