Supply Noise Coupling Paths and PSRR Across Frequency: Inputs and Outputs

Inputs and outputs contract

Inputs and Outputs for Supply Noise Coupling Paths and PSRR Across Frequency is anchored on PSRR(dB) versus frequency, output spur amplitude at switching harmonics, and supply-induced ENOB/SNDR degradation.. Convert observations into mechanism-backed and owner-bound actions.

INPUTS
  - operating context and aggressor profile
  - measurement setup and calibration state
  - model assumptions and validity bounds
  - boundary contracts and ownership map

OUTPUTS
  - evidence-backed mechanism classification
  - owner-signed bounded mitigation proposal
  - validation matrix and rollback trigger
  - release recommendation

Ownership split

OWNERSHIP LAYERS - Supply Noise Coupling Paths and PSRR Across Frequency

+----------------------+--------------------------------+--------------------------------+
| Team                 | Primary responsibility         | Closure artifact               |
+----------------------+--------------------------------+--------------------------------+
| power integrity owner | mechanism and margin ownership  | design rationale + constraints |
| analog macro designer | integration and runtime behavior | contract + telemetry evidence  |
| package and board engineer | bench closure and rollout gates | stress matrix + signoff memo   |
+----------------------+--------------------------------+--------------------------------+

Analog deep dive

Noise and SI closure is achieved by frequency-aware path analysis, not one-number guard-bands.

Concept diagram

NOISE PATH VIEW

source -> transfer function -> victim sensitivity -> system margin

Metric graph

NOISE CLOSURE

path unknown             ██████
path classified          █████████
validated mitigations    ███████

Metrics and artifacts to collect

• white/1-f noise decomposition

• PSRR versus frequency profile

• alias-folding sensitivity map

• phase-noise to jitter integration summary

Mini case study

A broadband spur issue persisted until teams modeled package and return-path coupling instead of relying on low-frequency PSRR numbers.

Debug branches

• Classify deterministic versus random contributors first.

• Map dominant transfer path before adding generic filtering.

• Use operating-mode-specific aggressor profiles in validation.

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.

Interface contract detail

Inputs should include setup assumptions, operating point, and aggressor profile.

Outputs should include one proving artifact and one owner-signed action.