Transcript Mid Semester Presentation - High Speed Digital Systems Laboratory

D0913
Project Status
Avital Katz
Elad Yaniv
High speed digital systems
Topics of Discussion
• PCI Express overview
• HyperLynx
• Simulations
High speed digital systems
Overview:
• Intel’s new PCI Express
High speed digital systems
HyperLynx
• HyperLynx EXT and GHz are bundles of
Mentor Graphics' HyperLynx family of
high-speed design tools, including signalintegrity, crosstalk, EMC, and advanced
high-speed analysis features
High speed digital systems
Our Simulations:
• What is Signal-Integrity Analysis?
“Signal-integrity analysis is concerned with the quality of the digital signals on
a printed circuit board.“
• Why do signal-integrity effects occur, and
why so much more today than before?
“when a higher-frequency signal (i.e., a signal that switches more quickly)
travels along the same trace, the trace exhibits circuit characteristics that
distort and degrade the signal.”
High speed digital systems
What is Crosstalk Analysis?
• Crosstalk analysis is a particular category of signal-integrity simulation
that looks specifically at unwanted noise generated between signals.
• Crosstalk is a particularly hard phenomenon to anticipate and control
unless you're able to simulate it, because there is almost no way of
intuitively knowing how much crosstalk voltage and current will
develop due to a given coupling.
High speed digital systems
High speed digital systems
High speed digital systems
What is EMC Analysis?
•
EMC analysis (electromagnetic-compatibility analysis), in contrast to
signal-integrity and crosstalk simulation which are concerned with
high-speed effects on the board, deals with how the PCB interferes
with other electronic boards and systems .
• the medium for this interference is electromagnetic radiation, which is
generated as an inevitable consequence of the currents flowing through
the board's traces when driver ICs switch.
High speed digital systems
What is "GHz Analysis"?
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•
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"GHz analysis" is a general term for the collection of special techniques used
to analyze gigabit-per-second (Gbps) SERDES-based designs .
GHz-level analysis must account for lossy effects and the electrical
complexities of vias. "Loss" refers to the phenomenon in which PCB-trace
resistance and the heating of dielectric materials (like FR-4) cause signals to
lose amplitude (i.e., attenuate) and suffer shape distortion (disperse) .
Sub-GHz designs are typically characterized with simple waveforms and delay
values, but GHz-level designs require special techniques like "eye diagrams"
and "jitter" measurement .
High speed digital systems