DAC Fundamentals: Codes, Full-Scale Range, and Quantization Behavior: Reports and Metrics

Reports and metrics

Reports and Metrics for DAC Fundamentals: Codes, Full-Scale Range, and Quantization Behavior is anchored on Monotonic transfer compliance, settling to within 0.5 LSB, and low-frequency effective resolution under a defined reference and load.. Convert observations into mechanism-backed and owner-bound actions.

A useful report explains why behavior moved, not only that behavior moved.

Evidence matrix

EVIDENCE MATRIX - DAC Fundamentals: Codes, Full-Scale Range, and Quantization Behavior

+-----------------------------+--------------------------------+--------------------------------+---------------------------+
| Evidence                    | Tells you                      | Does not prove                 | Next action               |
+-----------------------------+--------------------------------+--------------------------------+---------------------------+
| setup calibration logs      | measurement chain validity     | mechanism root cause           | pair with transfer checks |
| spectrum and jitter plots   | frequency-domain behavior      | ownership of failure           | correlate with activity   |
| PVT corner overlays         | sensitivity distribution       | runtime workload equivalence   | add workload replay       |
| model-vs-silicon deltas     | assumption mismatch classes    | direct fix correctness         | test bounded mitigation   |
| before-after matrix         | mitigation movement            | long-term field drift          | run stress suites         |
+-----------------------------+--------------------------------+--------------------------------+---------------------------+

• Track Monotonic transfer compliance, settling to within 0.5 LSB, and low-frequency effective resolution under a defined reference and load. on representative stress slices.

• Include setup, workload, and environmental metadata in every report.

• Correlate measured movement with source-path-victim assumptions.

• Call out contradictory evidence explicitly.

Analog deep dive

DAC closure needs both static transfer quality and dynamic glitch/spectral discipline.

Concept diagram

DAC OUTPUT CHAIN

code mapping -> switching network -> output path -> reconstruction filter

Metric graph

DAC RISK MIX

major-carry glitches     █████
settling residuals       ████
image leakage            ███

Metrics and artifacts to collect

• INL/DNL sweep package

• glitch energy and settling trend

• SFDR/THD versus output frequency

• reconstruction filter compliance

Mini case study

Good static linearity masked dynamic spur failures driven by switching asymmetry and insufficient reconstruction margin.

Debug branches

• Tie static transfer plots to dynamic spectral outcomes.

• Inspect major-carry behavior separately from small-step transitions.

• Validate output path with realistic load and package parasitics.

Senior review question

Ask: which source-path-victim boundary failed first, and which artifact proves it reproducibly?

Key takeaways

• Tie every analog claim to one measurable metric and one proving artifact.

• Prefer minimal reversible mitigations with explicit owner and rollback criteria.

Common pitfalls

• Treating all noise as one scalar instead of path and frequency dependent behavior.

• Changing multiple analog knobs at once and losing causality.

• Declaring closure from nominal behavior without stress replay evidence.

Report interpretation

Treat report movement as hypothesis evidence, not final proof.

Cross-check metrics with setup integrity and model assumptions.