Browse Prior Art Database

Method and Apparatus for Efficient Electrical Parameter Extractions

IP.com Disclosure Number: IPCOM000125916D
Original Publication Date: 2005-Jun-22
Included in the Prior Art Database: 2005-Jun-22
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Abstract

This article describes a method to extract efficiently the vertical and horizontal eye opening based on minimum vertical and horizontal requirements. using a novel one-pass computation, data is extracted and intermediate, smaller data set is created to enable efficient estimation of vertical and horizontal eye margins with orders of magnitude of efficiency improvement.

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Method and Apparatus for Efficient Electrical Parameter Extractions

High-speed serial links typically use an eye diagram to quantify amplitude and timing margins.

Eye opening extraction based on vertical and horizontal minimum opening criteria is computationally complex.

Real-time Oscilloscopes have the capability of capturing over 90 million points per trigger for a single channel.

Simulation traces can be very long as well.

Current methods require parsing of the data for each min vertical and horizontal opening criteria computation.

Picture below shows the horizontal timing margin given two different vertical eye opening requirements:

In this method, all data is parsed to extract the points that affect eye opening (minimum eye contour) and margin extractions are performed on the smaller contour data set. While the trace may have millions of points, the smaller contour dataset might only have a hundreds of data points, and thus is much easier to process.

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