PSPICE Simulation of BJT-plotting for different values of parameters

Discussion in 'Homework Help' started by LET_ME_THINK, Jan 28, 2007.


    Thread Starter New Member

    Jan 28, 2007
    I have got homework simulating characteristics of bjt in Common base , Common emitter, Common collector mode.
    I was simulating output characteristics of common base mode using:
    npn transistor-Q2
    current source- I1 attached to emitter
    base grounded
    collector attached to dc voltage source- V1

    I ran a DC sweep by varying V1 from -0.5v to+5v and put current marker at collector pin.
    I set the value of current source I1 at 2microAmperes.
    On running the simulation I got a plot beteen collector current and Vcb at a constant emitter current of 2microAmperes.

    Now, I want to obtain curves for differnet values of I1 (emitter current)
    in the same graph.
    How can I do this? Please help. My friend told me to use the Trace option, but I dont understand what he said.
  2. n9352527

    AAC Fanatic!

    Oct 14, 2005
    Set up another DC sweep for I1.
  3. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    If you can "step" I1, do it. Then all the results will be on the same graph.