Noise & IR at the Boundary: Tricky Q&A

Section Q&A bank

Use these drills after completing all topics in Noise & IR at the Boundary. Answer with boundary, mode, metric, artifact, owner, and regression.

How do you prove IR droop is causing jitter regressions?

[INT][AMS][NOISE-IR-SIGNOFF]

Q: How do you prove IR droop is causing jitter regressions?

A:
Time-correlate droop events with jitter/BER excursions in matched workload and mode conditions.

FOLLOW-UP TRAP: Comparing unrelated runs.

What makes an AMS signoff dashboard credible?

[INT][AMS][NOISE-IR-SIGNOFF]

Q: What makes an AMS signoff dashboard credible?

A:
Cross-domain evidence, explicit blockers/waivers, and owner-signed closure criteria.

FOLLOW-UP TRAP: Single metric pass used as release signal.

Q&A drill guide

BOUNDARY -> MECHANISM -> METRIC -> ARTIFACT -> FIX -> REGRESSION

Sketch while answering

BOUNDARY SIGNOFF

noise + IR + package + timing -> release decision

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.