aispice

aispice is an AI agent for analog and mixed-signal circuits that works on the LTspice schematics (.asc) in a folder. The agent reads a circuit as parts, the net on every pin, and directives, edits it with typed operations, runs a simulation, and checks the result against the user's specs before answering. It ships as a desktop app, a command-line tool, and an MCP server sharing one engine.

The agent can turn a SPICE netlist, or a circuit it reads from a picture, into a readable LTspice schematic, checked to netlist back to the same circuit. Simulation runs on ngspice, LTspice, Xyce, or Cadence Spectre, measuring gain, bandwidth, phase margin, noise, PSRR, and CMRR, with spec tables checked at one operating point or across process, voltage, and temperature corners, naming the worst corner of each spec. It also sweeps parameters, runs Monte Carlo analysis, and optimizes part values against several specs at once.

The README describes IC-block work on the IHP SG13G2 open PDK, sized at every corner, laid out, checked with DRC and LVS, and handed to ChipLeap as macros. The project is written in Rust and requires Rust 1.88 or newer.