AI circuit design that checks its own work.
Describe the circuit and the targets. The agent designs it, simulates it in SPICE, measures every target and repairs it until it passes.
From spec to verified circuit
Most AI tools stop at a drawing. An agent that simulates can tell you whether the drawing works.
- Start from a spec
- Write what you need in plain language: a cutoff, a gain, a supply, a load.
- Design and build
- The agent picks a topology, sizes the parts and places them on a real schematic you can edit.
- Simulate
- It runs the analyses that prove the spec in a SPICE engine: operating point, sweeps, AC or transient.
- Measure
- Each target is read from the result and shown with the measured value and the margin.
- Repair
- When a target misses, it finds the part that matters most, changes it and runs again.
- Cross-check
- Results can be repeated in ngspice, an independent engine, in the same tab.
Agentic analysis, not just schematics
The analyses engineers put off, run on request and summarised in plain language.
- Monte Carlo
- Component tolerances across many runs, with spread and yield against your spec.
- Worst-case corners
- Every tolerance pushed to its limits to find the corners that fail.
- Optimization
- Component values tuned to several targets at once, snapped to standard series.
- Stability
- Loop gain, phase margin and gain margin from the broken feedback loop.
- Noise and sensitivity
- Where the noise comes from, and which part moves each spec the most.
- Fault injection
- Open or short any part and see what the rest of the circuit does.
Grounded in a real circuit simulator
Every answer comes from a SPICE engine running in your browser, with operating point, DC, transient, AC, noise and parameter sweeps.
Questions
What is an AI circuit design agent?
Software that designs a circuit from a goal and checks its own work. Spice++ builds the schematic, runs a SPICE simulation, measures the result against your targets and repairs the design when a target misses.
Does the AI guess the numbers?
No. Values the agent reports, such as a cutoff frequency or a phase margin, are measured from a simulation you can open and inspect.
What kinds of circuits can it design?
Analog circuits at board level: filters, amplifiers, rectifiers, regulators and buck, boost or buck-boost converters. Transistor models are Level 1 MOSFETs and Ebers-Moll BJTs, which suit coursework and board design rather than on-chip work.
Can I edit what the agent builds?
Yes. It works on the same schematic you do. Move, change or replace any part, then ask it to verify again.
Is it free?
The simulator is free. The agent has a monthly allowance on the free plan, and paid plans add stronger models and more usage.