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Method and apparatus for ground bounce and power supply bounce detection

  • US 8,008,927 B1
  • Filed: 03/17/2009
  • Issued: 08/30/2011
  • Est. Priority Date: 04/24/2007
  • Status: Active Grant
First Claim
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1. A method for detecting ground bounce or power supply bounce, or both, comprising:

  • receiving a reference voltage;

    coupling a first input of an amplifier through a capacitor directly to a voltage rail to be measured;

    balancing said amplifier based on a quiescent non-bouncing state of said voltage rail using said reference voltage and a resistor coupled between the first input and a second input of the amplifier;

    measuring a bounce on said voltage rail in a non-quiescent state of said voltage rail, wherein said measuring is performed using;

    a sample and hold circuit having an input and an output, said input coupled to said amplifier output; and

    an analog to digital converter having an analog input and one or more digital outputs, said analog input coupled to said sample and hold output, said one or more digital outputs capable of communicating results of an analog to digital conversion; and

    reporting said measurement.

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