Analyses¶

All analyses return numbers parsed from MC9's own numeric output and leave MC9's plot window open, so you can follow with cursors and screenshots.

Call	What it does
`c.op()`	DC operating point: node voltages and per-device values (`IC`, `VBE`, `GM`, `RPI`, power ...). Fast, no waveform run.
`c.ac(fmin, fmax, points=401, curves=[...])`	Small-signal AC sweep. Always logarithmic (see the gotcha below).
`c.transient(t_stop, t_start=0, points=1001, curves=[...], max_step=None)`	Time domain. The result table has `points` rows between `t_start` and `t_stop`, so use `t_start > 0` to look at steady state.
`c.dc(source, start, stop, step, curves=[...], temp=[0, 25, 50])`	DC sweep of a source or part; a temperature list gives one run per temperature.
`c.distortion(f0, source, amplitude, out)`	MC9's Distortion window (HARM / IHD / THD plots), for screenshots. For numbers use `measure.thd`.
`c.dynamic_dc(temperature)`	Draws node voltages on the schematic.
`c.dynamic_ac(freq)`	Draws amplitude and phase of every node at one frequency.
`c.run("ac")`	Run with the settings currently in the file.

Curves are MC9 expressions: v(Ua), db(v(Ua)/v(Ue)), ph(...), mag(...), i(R1), v(R1) (voltage across a part), HARM(v(Ua)) ... A bare string means "y against the analysis' default x" (T, F, DCINPUT1); use ("F", "expr") to be explicit.

r = c.transient(10e-3, 8e-3, points=2001, curves=["v(Ue)", "v(Ua)"])
print(r.amplitude("v(Ua)"))             # (max-min)/2 in the window
r = c.dc("V2", 0, 20, 0.5, ["v(out)"], temp=[0, 25, 50])
for run in r.runs: print(run.label, run.peak("v(out)"))

AC sweep type

With MC9's default Sweep type = Auto, the numeric table is coarse and linearly spaced (e.g. 51 points between 1 Hz and 20 MHz) and MC9's cursors interpolate between those points. Band edges read that way can be wrong by more than 10 %. c.ac() therefore always writes a log sweep with 401 points; c.run("ac") warns if you configured Auto. Check convergence by doubling points.

Numeric precision

MC9 prints six significant digits. That is plenty for gains and bandwidths and for THD down to about 0.01 %.