Analog10y is a free, browser-based arena for analog circuit design. Draw transistors, resistors, capacitors and sources on a schematic canvas, size them, and watch every device turn green, gold or red by its operating region as your circuit is simulated in the browser with ngspice and the SkyWater SKY130 open process models.
105 graded problems in 15 topics, from a single transistor and current mirrors to differential pairs, two-stage op amps, comparators and oscillators.
A visual workbench with a live netlist, DC operating points and gain and phase plots.
Leaderboards for players and for universities.
Company hackathons: contests set by semiconductor companies, graded on the server.
Classes and assessments for professors, with private problems and a gradebook.