VM = 0.87 VSwitch pointUNKNOWNInspect metric contract
|gain|max = 11.90Max sampled gainUNKNOWNInspect metric contract
NML 0.73 V / NMH 0.81 VNoise marginsUNKNOWNInspect metric contract
SIMULATION / SA-CIR-SKY130-INV-VTC-001
CMOS inverter VTC and gain
Inverter VTC
Sweep VIN, plot VOUT, estimate switching point, sampled gain, and noise margins.
EXPLORE
Start with the observable.
Use this page when the simulation is the primary artifact. The linked lesson explains the concept; the linked lab keeps the visual replay surface available.
- Open the VTC plot and identify where VOUT crosses VIN.
- Compare the high-gain region with the usable digital input ranges.
- Use this as the first bridge from MOS device behavior to logic restoration.
RUN CARD
Conditions before conclusions.
The public MVP replays the saved dataset. It does not run a new ngspice job on the server.
Primary knobs
- VIN sweep: 0.00 V to 1.80 V in 0.01 V steps
- PMOS: W/L 1.0/0.15 um
- NMOS: W/L 0.5/0.15 um
- Corner: TT, temperature: 27 C
Saved outputs
- VTC curve
- sampled gain curve
- VM, VIL, VIH, NML, NMH markers
EXPORT
Download the public artifacts.
These exports are the supported public files for review. PDK files and restricted third-party material are not redistributed.
Dataset JSON
/data/sky130-inverter-vtc-web-v1.json
Open file ->Source netlist
/data/sky130-inverter-smoke-v2.spice
Open file ->Source notes
/data/SOURCE_NOTES.md
Open file ->METHODS
How the number was made.
Methods are written for citation discipline: the extraction rule matters as much as the plotted value.
Compute the nearest sampled VIN/VOUT crossing as the displayed switching point.
Keep this method attached when reusing the figure or metric.
Estimate gain from adjacent sampled VOUT/VIN points.
Keep this method attached when reusing the figure or metric.
Approximate VIL and VIH where sampled slope crosses -1.
Keep this method attached when reusing the figure or metric.
Publish source hashes and the PDK commit in the evidence payload.
Keep this method attached when reusing the figure or metric.
LIMITS
What this page does not claim.
The MVP is useful because the limits are visible. These statements prevent a teaching simulation from being cited as silicon evidence.
Model-connectivity smoke test only; not a final or optimized SRAM inverter.
Carry this boundary into any derivative note, paper draft, or slide.
Schematic-level DC only; no extracted parasitics or transient delay.
Carry this boundary into any derivative note, paper draft, or slide.
VIL and VIH are sampled approximations, not a signoff noise-margin extraction.
Carry this boundary into any derivative note, paper draft, or slide.
Applies only to the stated PDK commit, corner, temperature, supply, and sizing.
Carry this boundary into any derivative note, paper draft, or slide.
EVIDENCE
Trace the claim back to artifacts.
The evidence route remains the catalog-level browser; this page is the simulation-level reading card.
Public JSON preserves conditions, metrics, provenance, and limitations.
SA-CIR-SKY130-INV-VTC-001
The netlist SHA-256 and CSV SHA-256 are included in the evidence payload.
SA-CIR-SKY130-INV-VTC-001
The linked legacy lab remains the interactive visual surface for this seed.
SA-CIR-SKY130-INV-VTC-001
Public execution boundary
No server-side live ngspice execution, uploads, accounts, payments, comments, newsletter signup, or job/event submissions are active on this page.