Measurement of a Passive Circuit

We will find the impedance between nodes 1 and 0 in the circuit below  

I H Edit glttCT Macro PSpice Acce ori Qptiom Window flelp 

Add a test current source as shown. The test current source is added between nodes 1 and 0 because we are interested in the impedance between those two nodes. Either an AC current or an AC voltage source can be used. Wire the circuit shown. Note that ground now serves as node 0. 

Although this circuit has no dependent sources, inductors, or capacitors, the circuit could contain any circuit element and we could use this method to find the impedance. This circuit was chosen because the impedance is easily calculated and can be compared to the PSpice result. For this circuit, the calculated impedance between nodes f and O is 2 k 2. 

Set up an AC Sweep (PSpice, New Simulation Profile, AC Sweep/Noise) to sweep frequencies from 1 Hz to 1 MHz at 100 points per decade. Run PSpice (PSpice, Run). When Probe runs, add the trace V(l) / I (I test). Remember that voltage divided by current is impedance. We are dividing the voltage between nodes 1 and 0 by the current flowing into and out of those nodes. This is the impedance between those nodes. You will see this trace  

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