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High crest factor rms measurement method

  • US 6,392,402 B1
  • Filed: 07/30/1998
  • Issued: 05/21/2002
  • Est. Priority Date: 07/30/1998
  • Status: Expired due to Term
First Claim
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1. A method of determining an rms voltage corresponding to a time-varying electrical signal, comprising:

  • amplifying by using an amplifier the time-varying signal to produce an amplified signal, the amplifier characterized by a transfer function having a non-uniform slope, the slope being smaller for larger values of an incoming signal;

    applying the amplified signal to an analog to digital converter; and

    calculating an rms value representative of the incoming signal, the rms calculation including compensating for the non-uniform slope of the transfer function, thereby allowing increased accuracy in a higher slope region of the transfer function in which most voltage values of the time-varying signals lie and increased range in a lower sloped region in which fewer voltage values of the time-varying signal lie, to permit accurate determination of rms values at high crest factors.

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