Waveform data generating apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHiroshi Noda
Life of this patent
Estimating the term…
Abstract
By using only a template of a step response waveform when the waveform changes from "0" level to "1" level, a filter coefficient representing nature of voltage noises, such as reflection and rounding, in terms of polynomial of exponential function is generated by a filter coefficient generator. Respective logic data from a test pattern generator are divided by a filter order, and thus divided logic data are produced. The filter order corresponding to a number of taps. By operating the filter coefficient and the divided logic data by a filter arithmetic unit, data of an analog waveform is generated. The data of the analog waveform is skipped by a data skipping apparatus, the result is applied to an analog waveform generating apparatus, and an analog waveform is generated.
Claims11
A waveform data generating apparatus for generating data of an analog waveform, comprising:
- filter coefficient generating means using elements obtained by dividing a step response waveform when the step response waveform changes from a first logic level to a second logic level, for generating a filter coefficient representing nature of a voltage noise and rounding in terms of a polynomial of exponential function;
- divided logic data generating means for generating divided logic data obtained by dividing various logic data for testing by a filter order, the filter order means the number of taps;
- filter arithmetic operation means for operating the filter coefficient output from said filter coefficient generating means and the divided logic data generated from said divided logic data generating means for producing data of the analog waveform;
- and
- data skipping means for skipping data of the analog waveform produced by said filter arithmetic operation means.
A waveform data generating apparatus for generating data of an analog waveform, comprising:
- simulation means for outputting data obtained by simulating step response using a model of a transmission path or a circuit model;
- filter coefficient generating means for performing difference operation of adjacent data output from said simulation means, for generating a filter coefficient representing nature of a voltage noise;
- divided logic data generating means for generating divided logic data obtained by dividing various logic data for testing by a filter order;
- filter arithmetic operation means for operating the filter coefficient output from said filter coefficient generating means and the divided logic data generated from said divided logic data generating means for producing data of the analog waveform;
- and
- data skipping means for skipping data of the analog waveform produced by said filter arithmetic operation means.
Dependencies are inferred from the claim text.