Op-Amp Noise Estimator (input-referred) implementation

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-clean

Evidence ID

t5-203

Effect

Computation or source lookup only

Input and validation requirements

A negative bandwidth produces an undefined real-valued square root and must be rejected. The signed-density probe also exposes a convention hazard: literal signed arithmetic can produce a negative RMS result unless the instrument enforces or applies a nonnegative-magnitude convention.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

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

{
  "inputs": {
    "voltage_noise_density": 8,
    "voltage_noise_density_unit": "nV/√Hz",
    "bandwidth": 20000,
    "bandwidth_unit": "Hz"
  },
  "expected_outputs": {
    "total_rms_noise_voltage": 0.00000113137085,
    "total_rms_noise_voltage_unit": "V RMS",
    "display_value": 1.13137085,
    "display_unit": "µV RMS"
  },
  "working": "Convert en: 8 nV/√Hz = 8 × 10^-9 V/√Hz. √BW = √20000 = 141.4213562 √Hz. Vn_rms = (8 × 10^-9) × 141.4213562 = 1.13137085 × 10^-6 V RMS = 1.13137085 µV RMS."
}

Other records

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