Power supply voltage transition comparison circuit, power supply voltage transition comparison method, and semiconductor integrated circuit
AssigneeRenesas Electronics Corporation
InventorMakoto Soraoka
Life of this patent
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Abstract
A power supply voltage transition comparison circuit includes a comparator evaluation voltage setting circuit that generates a divided voltage of a power supply voltage; a comparator that compares a reference voltage with the divided voltage; a voltage evaluation circuit that evaluates the power supply voltage based on a result of the comparison; and an evaluation voltage setting value output circuit that changes a ratio between the power supply voltage and the divided voltage based on a result of an evaluation of the power supply voltage.
Claims19
A power supply voltage transition comparison circuit comprising:
- a comparator evaluation voltage setting circuit that generates a divided voltage of a power supply voltage;
- a comparator that compares a reference voltage with the divided voltage;
- a voltage evaluation circuit that evaluates the power supply voltage based on a result of the comparison;
- and
- an evaluation voltage setting value output circuit that changes a ratio between the power supply voltage and the divided voltage based on a result of an evaluation of the power supply voltage.
A power supply voltage transition comparison method, comprising:
- generating a divided voltage of a power supply;
- comparing a reference voltage with the divided voltage;
- evaluating the power supply voltage based on a result of the comparison;
- and
- changing a ratio between the power supply voltage and the divided voltage based on a result of an evaluation of the power supply voltage.
A power supply voltage transition comparison circuit, comprising:
- a comparator evaluation voltage setting circuit that generates a divided voltage based on a power supply voltage;
- a comparator that compares a reference voltage with the divided voltage;
- a voltage evaluation circuit that evaluates the power supply voltage based on a result of the comparison;
- and
- an evaluation voltage setting value output circuit that outputs an evaluation voltage setting signal base on a result of the evaluation,
- wherein the comparator evaluation voltage setting circuit generates the divided voltage based on the evaluation voltage setting signal.
Dependencies are inferred from the claim text.