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VOLTAGE REGULATOR

  • US 20120242316A1
  • Filed: 03/20/2012
  • Published: 09/27/2012
  • Est. Priority Date: 03/24/2011
  • Status: Active Grant
First Claim
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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, andwherein the positive power supply of the differential amplifier circuit is connected to the substrate (n-well) of the third P-channel transistor.

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