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EMBEDDED TERMINATION RESISTORS WHICH AUTOMATICALL Y COMPENSATE FOR PROCESS-INDUCED IMPEDANCE VARIATIONS IN TRANSMISSION LINES

IP.com Disclosure Number: IPCOM000009745D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2002-Sep-16
Document File: 4 page(s) / 219K

Publishing Venue

Motorola

Related People

Authors:
Gregory Dunn Lawrence Lach Jovica Savic Allyson Beuhler

Abstract

For high speed digital applications, chip, packaging, and board interconnections can exhibit electrical resonances and reflections which degrade signal integrity and electrical system reliability. The problem increases with higher frequencies (becanse a larger number of traces in a given board design exhibit such behavior with shorter rise times) and lower power supply voltages (because lower noise is needed). To prevent this problem, transmission lines are typically terminated with discrete surfacemounted resistors, either in series with the line (series termination) or connecting to ground (paralleI termination; a capacitor is sometimes placed between the resistor and ground to reduce static power dissipation).