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Apparatuses and methods responsive to output variations in voltage regulators

  • US 8,773,096 B2
  • Filed: 03/29/2012
  • Issued: 07/08/2014
  • Est. Priority Date: 03/29/2012
  • Status: Active Grant
First Claim
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1. A voltage regulator, comprising:

  • an amplifier configured to generate a difference voltage responsive to a comparison of a reference voltage and a feedback voltage;

    an output driver operably coupled to the amplifier and configured to drive a regulated output voltage responsive to the difference voltage;

    an impedance circuit operably coupled between the output driver and a low power source and configured to establish the feedback voltage responsive to a current through the impedance circuit; and

    a variation detector operably coupled between the regulated output voltage and the difference voltage and configured to modify the difference voltage responsive to a rapid change of the regulated output voltage capacitively coupled to the variation detector, wherein the variation detector comprises;

    a high-side variation detector, comprising;

    a high-side capacitance operably coupled between the regulated output voltage and a high-side sense signal;

    a high-side resistance operably coupled between a high power source and the high-side sense signal; and

    a p-channel transistor with a source operably coupled to the high power source, a drain operably coupled to the difference voltage, and a gate operably coupled to the high-side sense signal; and

    a low-side variation detector, comprising;

    a low-side capacitance operably coupled between the regulated output voltage and a low-side sense signal;

    a low-side resistance operably coupled between the low power source and the low-side sense signal; and

    an n-channel transistor with a source operably coupled to the low power source, a drain operably coupled to the difference voltage, and a gate operably coupled to the low-side sense signal.

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