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SI necessitates broadband analysis from DC upto
multi-GHz frequencies.
At those high-frequencies, full-wave
electromagnetic effects are critical in effecting phase and
propagation.
Crosstalk and through-transmission prediction
require a high-dynamic range simulation capability, and global coupling, large return paths, and
novel cust-cutting system designs necessitate large-scale 3D electromagnetic simulation and speeds
that can enable multiple design iterations.
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High-speed power transients imply that PI requires
broadband DC to multi-GHZ analysis for complete steady-state, transient, aned harmonic
simulation.
Impedance profiles built from these solutions need
to be flexible, accurate, and complete.
Reduced-cost packages and systems imply that
complex 3D effects are the norm, necessitating large-scale high-speed 3D simulation to capture all
dominant coupling effects.
The simulation needs to be sufficient accurate to
represent appropriately all coupling effects in the time domain through the generation of accurate,
error-controllable SPICE models.
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Electromagnetic interference issues can be global in nature, and be present
anywhere in the chip-package-board ecosystem. All 3D discontinuities are potential sources of EMI
and need to be modeled.
EMI
modeling requires high dynamic range and high accuracy in simulation in order to predict radiation
due to small discrepancies in otherwise well-designed differential systems. The effect of chip
interconnect and substrate noise sources need to be accounted for, and near and far fields, current
densities, and current spectra need to be computed for entire systems.
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Switching noise integrity requires the combined simulation and modeling of
multiple noise effects.
Combined power and signal integrity is necessitated
in simultaneous switch noise (SSN) and simultaneous switching output (SSO).
Combined EMI and power integrity is required for
early EMI prediction and mitigation.
SNI in general requires high dynamic range and high
accuracy, complete system-level electrical simulation, and sufficient modeling and simulation speed
to enable multiple design passes with user feedback.
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