Analog Supply Noise: Review Checklist

Review checklist

Review Checklist for Analog Supply Noise focuses on supply ripple, spur coupling, analog performance degradation. The goal is to connect observed symptom to boundary mechanism, ownership, and signoff risk.

• Boundary assumptions are versioned and signed.

• Mode matrix (power/clock/reset/stress) is explicit.

• Physical context (floorplan/package/power) is included where relevant.

• Metric and artifact references are reproducible.

• Waivers have owner, expiry, and mitigation.

• Owners signed: PI owner, analog lead, package owner.

Sign-off ownership

OWNERSHIP MAP — Analog Supply Noise

artifact                  owner
----------------------    -----------------------------
integration artifact    PI owner
implementation artifact analog lead
signoff artifact        package owner

Every boundary issue needs a named owner before fixes start.

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?

Key takeaways

• State boundary, mode, and evidence tag with every claim.

• Always align analog, digital, and physical owners before signoff decisions.

Common pitfalls

• Fixing averages while tails still fail.

• Skipping package/supply evidence in jitter or SerDes issues.

• Shipping with waivers that lack owner and expiration criteria.

Principal AMS review addendum

Switching current bursts from digital domains couple through shared impedance and package parasitics, modulating analog supply quality and phase noise.

Metric: supply ripple, spur coupling, analog performance degradation