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Method for a design process for assuring compliance with differential and crosstalk spacing requirements between signal traces using a delta area method

IP.com Disclosure Number: IPCOM000007987D
Publication Date: 2002-May-09
Document File: 2 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a design process for assuring compliance with differential and crosstalk spacing requirements between signal traces using a delta area method. Benefits include improved signal quality.

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Method for a design process for assuring compliance with differential and crosstalk spacing requirements between signal traces using a delta area method

Disclosed is a method for a design process for assuring compliance with differential and crosstalk spacing requirements between signal traces using a delta area method. Benefits include improved signal quality.

Background

      Routing high-speed differential signals is electrically constrained by reducing return and common mode conversion loss. Electrically, a return loss exists any time both traces diverge or converge symmetrically from one another. Common mode conversion loss exists if traces are not symmetrical. Both quantities are important.

      These losses can be reduced to physical routing rules for keeping a pair of lines parallel, equal length, and symmetrical. This arrangement cannot be perfectly achieved on a printed wiring board (PWB). Conventional rules do not directly correlate to return and common mode conversion loss.

              Conventional methods employed by software to determine the degree of compliance to spacing requirements use a quantum approach to spacing violation calculations. Violations within a range are treated equally and sorted by length without considering the actual degree of violation within the range.

Description

      The disclosed method is the measurement, evaluation, and ranking of a signal trace and its spatial relationship to other traces. The area of intersection is measured between the actual trace routing...