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Content type Text
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Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Technology Report Recent Development ♦ Signal Integrity Theory ♦ Reflection Noise Due ♦ Signal Integrity ♦ Clock Rate ♦ Engineering Staff ♦ Crosstalk Noise Due ♦ Conductive Surface ♦ Power Ground Delivery System ♦ Interconnect Discontinuity ♦ High Speed Digital Design ♦ Test Equipment ♦ Foundry Service ♦ Signal Integrity Engineering ♦ Sigrity Inc ♦ Signal Trace ♦ Signal Waveform Distortion ♦ Technical Note ♦ Power Ground Noise Due ♦ Component Package ♦ Physical Length ♦ Eda Tool ♦ Physical Structure ♦ Different Mechanism ♦ High-speed System ♦ Major Issue ♦ Ground Bounce ♦ Concerned Noise Problem
Abstract Signal Integrity is at the center of high speed digital design, as clock rates reach higher into the GHz ranges. At these frequencies, the physical structure of component packages, p.c. boards, cables, connectors and enclosures becomes large in terms of wavelength. Even “ground ” is no longer constant, since signals can propagate along conductive surfaces. Table 1 shows the major issues in signal integrity engineering. These challenges are being addressed by the engineering staffs of OEMs, as well as the vendors of EDA tools, test equipment, foundry services, and p.c. board or contract assembly services. A technical note from Sigrity Inc. (www.sigrity.com) sums up the issues like this: “Timing is everything in a high-speed system. Signal timing depends on the delay caused by the physical length that the signal must propagate. It also depends on the shape of the waveform when the threshold is reached. Signal waveform distortions can be caused by different mechanisms. But there are three mostly concerned noise problems: • Reflection Noise Due to impedance mismatch, stubs, vias and other interconnect discontinuities. • Crosstalk Noise Due to electromagnetic coupling between signal traces and vias. • Power/Ground Noise Due to parasitics of the power/ground delivery system during drivers ’ simultaneous switching output (SSO). It is sometimes also called Ground Bounce,
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Technical Report
Publisher Date 2010-01-01