Wrapper/calibration choices trade observability, complexity, and residual error.
+------------------+----------------+----------------+----------------+
| Approach | Strength | Weakness | Best when |
+------------------+----------------+----------------+----------------+
| Conservative | robust | more overhead | new tapeout |
| Balanced | practical | needs rigor | mature flow |
| Aggressive | faster | high regressions | late stage |
| Architectural | durable | slow loop | recurring issue |
+------------------+----------------+----------------+----------------+Choose the smallest change that proves mechanism and preserves system margins.
Treating all AMS problems as analog-only
Skipping package and power evidence
AMS EVIDENCE MATRIX — Data Validity Debug
+-------------------+------------------------+--------------------------+-------------------------+
| Evidence | Tells you | Does not prove | Next action |
+-------------------+------------------------+--------------------------+-------------------------+
| Waveform/log pair | sequence behavior | physical root cause | correlate with signoff |
| Signoff report | metric movement | contract correctness | audit assumptions |
| Floorplan view | physical proximity | dynamic mode behavior | run stress mode |
| Firmware trace | state progression | analog quality | combine with lab data |
| Dashboard summary | closure status | single-failure mechanism | inspect raw artifacts |
+-------------------+------------------------+--------------------------+-------------------------+Wrapper and sampling contracts determine data trustworthiness.
CONVERTER DATA FLOW
sampling clock -> wrapper -> sync boundary -> system consumerINVALID SAMPLE BURSTS
time ---> _|¯¯|__|¯¯¯|____|¯|_sample validity ratio
calibration convergence
CDC audit
overflow/stale sample counters
Mode transition changed sample phase and invalidated wrapper framing assumptions.
Sample timing contract
Calibration hook behavior
Wrapper CDC integrity
Ask: what boundary condition proves this topic is actually closed?
State boundary, mode, and evidence tag with every claim.
Always align analog, digital, and physical owners before signoff decisions.
Fixing averages while tails still fail.
Skipping package/supply evidence in jitter or SerDes issues.
Shipping with waivers that lack owner and expiration criteria.
Data validity must combine framing correctness, saturation/overflow signaling, and synchronization sanity so software trusts converter samples.
Metric: invalid sample bursts, clipping incidents, stale-data escapes
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