Source: https://guthlabs.ai/docs/instruments/signal-to-noise-ratio-sinad-enob-calculator/implementation/

instrument implementation / implementation-contract

# Signal-to-Noise Ratio / SINAD / ENOB Calculator implementation

A source-bound implementation contract for Signal-to-Noise Ratio / SINAD / ENOB Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-with-binding-errata

**Evidence ID**: t5-199

**Effect**: Computation or source lookup only

## Input and validation requirements

The only supplied equation defines SINAD-to-ENOB arithmetic. It does not define SNR-to-SINAD, THD-to-SINAD, or any actual formula branches, and it does not specify validation for units or extreme magnitudes. Large finite JavaScript inputs also lose the 1.76 subtraction through floating-point precision.

## Required corrections

````
[
  {
    "vector": 3,
    "field": "ENOB_bits",
    "wrong": 10,
    "correct": 10.0066,
    "cause": "justified with 6.02×10=60.24 (false); her own v2 reports unrounded"
  }
]
````

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "SINAD_dB": 1.76
  },
  "expected_outputs": {
    "ENOB_bits": 0
  },
  "working": "ENOB=(SINAD−1.76)/6.02=(1.76−1.76)/6.02=0/6.02=0 bits. Boundary case: SINAD equal to 1.76 dB produces zero ENOB."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/signal-to-noise-ratio-sinad-enob-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/signal-to-noise-ratio-sinad-enob-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/signal-to-noise-ratio-sinad-enob-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`

- `tranche errata record`