AMS Interface · All levels

Analog-Digital Boundaries: Tricky Q&A

Senior interview and review questions for Analog-Digital Boundaries.

Section Q&A bank

Use these drills after completing all topics in Analog-Digital Boundaries. Answer with boundary, mode, metric, artifact, owner, and regression.

What is the first sign boundary cells are underspecified?

diagram

[INT][AMS][ANALOG-DIGITAL-BOUNDARIES]

Q: What is the first sign boundary cells are underspecified?

A:
Mode-specific failures where voltage or state assumptions differ between analog and digital domains.

FOLLOW-UP TRAP: Treating them as random lab noise.

When is an ESD waiver acceptable?

diagram

[INT][AMS][ANALOG-DIGITAL-BOUNDARIES]

Q: When is an ESD waiver acceptable?

A:
Only with foundry-backed rationale, explicit affected modes, and mitigation/monitoring plan.

FOLLOW-UP TRAP: Using schedule pressure as justification.

How do you prove a handoff contract is complete?

diagram

[INT][AMS][ANALOG-DIGITAL-BOUNDARIES]

Q: How do you prove a handoff contract is complete?

A:
Every clock/reset/power/mode assumption maps to a check, owner, and artifact.

FOLLOW-UP TRAP: Reviewing only functional paths.

Q&A drill guide

diagram

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

Sketch while answering

diagram

BOUNDARY CONTRACT FLOW

analog intent -> boundary implementation -> digital wrapper -> signed review

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.

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