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Voltage regulator pole shifting method and apparatus

  • US 7,755,338 B2
  • Filed: 07/12/2007
  • Issued: 07/13/2010
  • Est. Priority Date: 07/12/2007
  • Status: Expired due to Fees
First Claim
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1. A voltage regulator, comprising:

  • a common-source output stage configured to drive a capacitive load with a regulated voltage responsive to a signal applied to the common-source output stage, the capacitive load setting the dominant pole of the voltage regulator;

    a first amplifier stage configured to amplify the difference between the regulated voltage and a reference voltage;

    a second amplifier stage configured to drive the common-source output stage with a signal corresponding to the difference between the regulated voltage and the reference voltage; and

    a feedback path configured to couple an output node of the second amplifier stage to an input node of the second amplifier stage for reducing the output resistance of the second amplifier stage to shift a non-dominant pole of the voltage regulator set by the second amplifier stage.

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