ngspice/examples/pss/vdp_osc_pss.cir

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Van Der Pol Oscillator
* Prediceted frequency is about 4.54167e+06 Hz.
* Third harmonic is high as the first one
Ba gib 0 I=-1e-2*v(gib,0)+1e-2*v(gib,0)^3
* Q is about 10
La gib 0 1.2e-6
Ra gib 0 158.113
Ca gib 0 1e-9 ic=0.5
*La gib 0 1e-9
*Ra gib 0 474.6
*Ca gib 0 1e-9 ic=0.5
* Ghost node... Test for my PSS!
Rb bad 0 1k
*.tran 1e-9 150e-6 uic
.pss 0.8e6 130e-6 1 50 10 50 5e-3 uic