Noise & IR at the Boundary

Section goal

Supply noise, IR behavior near analog islands, package interactions, and AMS-focused signoff dashboards.

How to study this section

1. Start with topic hubs to learn contract and ownership.

2. Use mechanism and reports pages to map symptoms to root causes.

3. Use debug and worked-example pages for war-room practice.

4. Close with checklist and PPA pages before signing any change.

Topics

1. analog-supply-noise/ — Analog Supply Noise

2. ir-at-analog-islands/ — IR at Analog Islands

3. package-ams-effects/ — Package Effects on AMS

4. ams-signoff-dashboard/ — AMS Signoff Dashboard

Related topics

• AMS course hub

AMS deep dive

AMS signoff is a combined noise, IR, timing, and package decision.

Concept diagram

BOUNDARY SIGNOFF

noise + IR + package + timing -> release decision

Metric graph

RISK DASHBOARD

open blockers █████
waivers       ███

Reports and artifacts

• supply ripple spectrum

• IR around analog islands

• package PI summary

• release dashboard

Mini case study

IR hotspot at analog island caused jitter spikes only under burst traffic.

Debug branches

• Correlate droop and jitter

• Check package return path

• Validate mode-specific activity profile

Senior review question

Ask: what boundary condition proves this topic is actually closed?