Here you can find a collection of electric and electronic circuits realized by the PSpice tool or by Cadence ORCAD Capture Lite. You can freely download, use or modify all the stuff you'll find here. Anyone who wishes to collaborate and share his experience, i invited to send, his works.
OrCAD 17.2 PSpice Designer Lite Software, it's freely downlonable, after registation, here
PSpice is a free open source software, download it here

Transfer function

How to plot the transfer function of any circuit using PSpice.

  • draw the circuit (in the example, a Band Pass)
  • use the part VAC as input (Sinusoidal voltage generator), the amplitude (ACMAG) is set to 1
  • place on the output the 'vdb' 'vphase' probes
  • set the analysis on 'AC sweep' and choose the appropriate frequency range
  • run the simulation (F11)
Now, on the plot, module and phase have the same scale factor, it's better to:
  • add a new Y axis (Plot --> Add Y axis)
  • click one label (es. VDB(V1:OUT), cut (CTRL+X)
  • click on axis n. 2 to select it, paste (CTRL+V). Now the scale factor is different for module and phase.


JFET small signal ampification circuit (ORCAD Capture Lite)

by OrCad Light

(The Oskar one)


JFET characteristics (ORCAD Capture Lite)

JFET input and output characteristics by OrCad Light

VDD is a ramp voltage generator that creates a voltage ramp in VDS . To parametrize in VGS the curves, Vgg changes by regular steps.

  • change the Vgg 'value' to {VGS}
  • insert the 'param' component
  • double click 'PARAMETER'
  • 'New Property'
  • 'Name'=VGS; 'Value'=0
  • click on the newly created property (VGS)
  • click 'Display..'
  • select 'Name and Value'
  • in 'edit simulation profile' check 'parametric sweep'
  • the 'sweep variabile'is the 'global parameter' VGS
  • set 'Stat value', 'End value' ed 'Increment' or write the desired values of VGS in 'Value list' separated by a space
An error may occur attempting to change the x variable from time to another one:
ERROR(ORPROBE-3217): Only 1 expression allowed for the X variable
solution: add '@1' to the name of the desidered x variable.
For example V(J2:d) becames V(J2:d)@1


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