Review the saved study
- Open Verification. In Analysis & engine, check the engine and AC frequency sweep.
- Confirm Tolerance corners with R1 resistance ±5% and C1 capacitance ±10%. Choose native if ngspice is unavailable.
The run button shows four cases: every low/high combination of two parameters.
Understand what is being measured
- In Measurement & limits, inspect the positive output terminal and source reference.
- The selected measurement is First −3 dB low-pass crossing. Keep lower and upper limits at 130 and 200 Hz.
The study will test cutoff frequency, rather than comparing raw node voltages.
If you get stuck: Blank limits only record a measurement. They do not assert a pass/fail result.
Run and inspect all corners
- Choose Run 4 cases. Inspect the completed count and each row's assessment.
- Choose Inspect on a run, then expand its model notes, solver log and reproducibility details.
All four cases pass. Cutoffs are approximately 137.5–185.7 Hz; engine/version and run inputs are available.
If you get stuck: Unavailable engines, rate limits or cancellation can leave an Incomplete study. Do not read a partial run as a complete pass.
Make a failing requirement visible
- Change the upper limit to 170 Hz, then run the four cases again.
- The highest cutoff exceeds the limit. Inspect that case, then restore the upper limit to 200 Hz and rerun if you want a passing final report.
At least one case fails the tighter 170 Hz requirement. Changing the requirement changes the assessment.
Save setup and captured evidence
- Download Report JSON for the circuits, settings, results and solver provenance. Download Results CSV for a compact table.
- Save project to retain the study setup. Keep the reports separately: project saving does not store the captured runs.
You have a reusable study and a separate record of what was actually simulated.
If you get stuck: Corner checks evaluate the selected models and endpoints. They do not certify physical ratings or production yield.