A browser-native pole-zero analysis instrument — symbolic and numeric transfer-function analysis for small-signal circuits. It runs on a Pyodide/SymPy runtime that loads from a CDN, so the first load takes about 15 seconds and needs an internet connection; it works best in a current Edge or Chrome.
Runs entirely in your browser
Live instance — Pyodide runtime loads from CDN
Enter an H(s) expression directly, give numerator–denominator polynomials, or drop in a netlist — native linear netlists plus LTspice .asc and SPICE formats. Built-in examples, a gm + Type-II compensator and an FA-sense network, get you from zero to a result in one click.
Write values the way you would on a schematic — engineering suffixes like 10k, 2Meg, 159p, and 4.7u are understood natively, and dependent values such as C_FF = 0.1*Cdut stay symbolic through the whole analysis.
Modified nodal analysis with dependency-cone reduction solves only the subcircuit your transfer function actually touches. A complexity guard keeps symbolic blow-ups in check, and a fast numeric mode takes over when exact algebra stops paying off.
Loop-gain measurement with a single-point voltage-injection loop break — insert VIN_INJECT and read VOUT_RETURN, then undo the break cleanly when you are done. No manual netlist surgery.
The exact H(s), DC gain, factored and Bode forms, symbolic corner frequencies, LHP/RHP root classification, w0/Q for second-order factors, and log sensitivities to every component — everything a compensation review needs on one screen.
Drag live component sliders and watch the Bode and s-plane plots move, run parameter sweeps in Explore, or flip the problem around in Design mode: give it a target corner, w0, or Q and let it solve for the component values that hit it.
Limitations — no coupled inductors or nonlinear / transistor-level devices; the Pyodide runtime loads from a CDN, so an internet connection is required.
PZ Studio is the first of a small set of bench instruments I am building for the browser. If you have a workflow that deserves one, I would like to hear about it.