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Method for characterizing interconnect timing characteristics using reference ring oscillator circuit

  • US 5,790,479 A
  • Filed: 09/17/1996
  • Issued: 08/04/1998
  • Est. Priority Date: 09/17/1996
  • Status: Expired due to Term
First Claim
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1. A method of determining timing characteristics of a test interconnect structure, said method comprising the steps of:

  • a) determining timing characteristics of reference logic units and reference interconnect structures that comprise a reference ring oscillator circuit using direct measurement;

    b) measuring a first frequency of oscillation of said reference ring oscillator circuit;

    c) inserting said test interconnect structure onto one of said reference interconnect structures of said reference ring oscillator circuit;

    d) measuring a second frequency of oscillation of said reference ring oscillator circuit having said test interconnect structure inserted therein;

    e) subtracting the period of said first frequency from the period of said second frequency to determine a first time value; and

    f) based on said first time value and determined timing characteristics of said one of said reference interconnect structures, determining said timing characteristics of said test interconnect structure.

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