Patent ID: 7038529

Claim:
A voltage stabilizer that stabilizes the voltage of a power supply line on a semiconductor substrate, comprising: a monitoring section connected to the power supply line that monitors a potential of the power supply line and outputs a monitor signal indicating the monitoring result; a first current control section that stabilizes the voltage of the power supply line by passing a current corresponding to the monitor signal from the power supply line, capable of freely passing a current continuously; and a high potential generation section that generates a high potential node having a predetermined high potential higher than the potential of the power supply line by boosting power from the power supply line, wherein the monitoring section comprises: a first monitoring section that generates a first monitor signal indicating a variation toward the high potential side when the potential of the power supply line changes toward the high potential side; and a second monitoring section that generates a second monitor signal indicating a variation toward the low potential side when the potential of the power supply line changes toward the low potential side, the first current control section passes a current corresponding to the first monitor signal from the power supply line, and in addition to the first current control section, a second current control section that passes a current corresponding to the second monitor signal from the high potential node into the power supply line is provided.