Spice As A Curve Tracer: BJT I-V Characteristics ** Circuit Description ** Vce 1 0 DC 0V Ib 0 2 DC 10uA * device under test Q1 1 2 0 npn_transistor * transistor model statement .model npn_transistor NPN (Is=1.8104e-15A Bf=100 VAf=35V) ** Analysis Requests ** * vary Vce from 0V to 10V in steps of 100mV .DC Vce 0V +10V 100mV ** Output Requests ** .plot DC I(Vce) .probe .end