ANALYSIS TYPE / 03
transient response · simultaneous switching · noise budget
Overview
Analysing voltage droop and simultaneous switching output noise to ensure all IC power pins remain within datasheet supply tolerance during worst-case switching events — validating timing margin and functional reliability.
Deliverables
Key Aspects
Simulating power supply voltage droop during IC load current step events, computing worst-case undershoot and recovery time relative to datasheet supply tolerance limits.
Evaluating voltage noise induced on power and ground planes by simultaneous switching of multiple output drivers — identifying timing margin risk in high-driver-count interfaces.
Computing ground bounce magnitude at IC VSS pins during large current transients, assessing impact on internal logic switching thresholds and setup/hold timing.
Partitioning the total power supply noise budget across PDN, decoupling, and plane inductance contributors to guide prioritised design improvements.
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