Voltage drop measurement circuit
First Claim
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1. A voltage drop measurement circuit, comprising:
- a voltage drop circuit configured to generate an output voltage and fluctuate the output voltage according to a fluctuation of a power supply voltage, a voltage difference between the output voltage and the power supply voltage being maintained by a predetermined amount; and
a flip-flop configured to retain a flag indicating a drop of the power supply voltage according to the output voltage.
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Abstract
A voltage drop measurement circuit includes a voltage drop circuit to generate an output voltage and fluctuate the output voltage according to a fluctuation in a power supply voltage, where the output voltage being the power supply voltage dropped by a predetermined amount and a flip-flop to retain a flag indicating a drop in the power supply voltage according to the output voltage.
15 Citations
15 Claims
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1. A voltage drop measurement circuit, comprising:
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a voltage drop circuit configured to generate an output voltage and fluctuate the output voltage according to a fluctuation of a power supply voltage, a voltage difference between the output voltage and the power supply voltage being maintained by a predetermined amount; and a flip-flop configured to retain a flag indicating a drop of the power supply voltage according to the output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A voltage drop measurement circuit, comprising:
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a voltage drop circuit to generate an output voltage and fluctuate the output voltage according to a fluctuation of a power supply voltage, the output voltage being the power supply voltage dropped by a predetermined amount; and a flip-flop to retain a flag indicating a drop of the power supply voltage according to the output voltage, wherein the flip-flop includes an input voltage threshold to evaluate a level of an input signal and the input voltage threshold fluctuates according to the fluctuation in the power supply voltage, and wherein the input voltage threshold and the output voltage fluctuate at different sensitivities for the fluctuation in the power supply voltage.
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11. A voltage drop measurement circuit, comprising:
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a voltage drop circuit which generates an output voltage that fluctuates based on a power supply voltage; and a detector which has a threshold voltage and which determines a drop of the power supply voltage by inversing a voltage difference between the output voltage and the threshold voltage, wherein the threshold voltage fluctuates based on the power supply voltage, the output voltage fluctuates more widely when the power supply voltage fluctuates than the threshold voltage. - View Dependent Claims (12, 13, 14, 15)
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Specification