8.10 Simulation

Outcome 10 of 12 in domain 8 · Systems, reading and designing a complete device

Seeing an analog circuit before soldering it: LTspice, ngspice, and knowing when they lie.

My targets

I declare:

Enter an RC circuit, a rectifier and a transistor amp in LTspice or ngspice and run the three basic analyses (operating point, transient, frequency).
Compare a simulation to the measurement of the same build and explain each gap (model, parasitics, tolerances).
Simulate a power amp stage and its feedback loop, and read the stability margin in the simulation.
Import a manufacturer’s SPICE model for a component and say what the model doesn’t contain (heat, package, ageing).
Sweep a value to choose a component, then run a Monte Carlo on the tolerances.
Diagnosis: a circuit that works in simulation and not on the bench, ideal supply, perfect ground, or component outside the model.