Patent ID: 8547080
Filing Date: 2013-10-01
Classification: G05F,H02J

Abstract:
1. A voltage regulator, comprising: a positive power supply terminal, a negative power supply terminal, and an output terminal; a first P-channel transistor provided between the positive power supply terminal and the output terminal; a differential amplifier circuit for controlling a gate voltage of the first P-channel transistor so that a voltage at the output terminal becomes constant; a second P-channel transistor including a gate connected to the negative power supply terminal, a drain connected to the positive power supply terminal, and a source connected to a substrate (n-well) thereof, for connecting a substrate (n-well) of the first P-channel transistor to the positive power supply terminal; and a third P-channel transistor including a gate connected to the negative power supply terminal, a drain connected to the positive power supply terminal, and a source connected to a substrate (n-well) thereof, for connecting a positive power supply of the differential amplifier circuit to the positive power supply terminal, wherein the substrate (n-well) of the first P-channel transistor is connected to the substrate (n-well) of the second P-channel transistor, and wherein the positive power supply of the differential amplifier circuit is connected to the substrate (n-well) of the third P-channel transistor.