×

Circuit and method for modeling I/O

  • US 6,983,432 B2
  • Filed: 01/16/2002
  • Issued: 01/03/2006
  • Est. Priority Date: 05/04/2001
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for creating a model of inputs and outputs of integrated circuits, comprising the steps of:

  • representing in the model, the output characteristics of integrated circuit driver circuits by two types of elements, switching and non-switching;

    tabulating the output characteristics for each of the elements by applying a DC voltage source on the output of the driver circuits and measuring the current through each element;

    characterizing the switching elements represented as voltage-time controlled resistors by obtaining the product of DC impedance as a function of voltage and scalars that are functions of time; and

    embedding in the model, equations that are functions of input edge arrival times and cycle time for each scalar in order to modify behavior of the switching and non-switching elements to fit their environment.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×