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How does PSpice measure input impedance?
Connect one terminal to GND, and connect the other terminal to the appropriate pin of the device under test. Do an AC simulation, and plot the voltage on that pin. Remembering that Z(jω)=V(jω)/I(jω), and since I(jω)=1 (because you’ve set it to 1), then the impedance is simply equal to the voltage: Z(jω)=V(jω).
How do you run simulation in PSpice?
Left-click on OK to accept the Simulation settings and close the Simulation Settings form. Then, from the menu take PSpice>Run to run the simulation. If not already enabled, left-click on the V circular icon to enable the display of the Voltage Bias values in the schematic.
How do you simulate frequency response in PSpice?
Set up a new simulation. Select Analysis Type: AC Sweep/Noise. Under AC Sweep Type select: Linear and enter a start frequency of 10, stop frequency of 5000 and total point of 100. Using these settings PSPICE will calculate the sinusoidal steady state response of the circuit for the each of the frequencies indicated.
Why is PSpice not a good model of a circuit?
PSpice relies on the assumption that, when the supplies are close enough to 0, all devices in the circuit are turned off. The above formula violates this assumption. Further, it is not a good model of a real constant-power load for low voltages.
How to calculate the bias point in PSpice?
With this formula, the power = v*i = v (A,B)* (pload/v (A,B)) = pload, as desired. Unfortunately, this first approximation behaves badly near v = 0. When calculating the bias point for more difficult circuits, PSpice reduces the power supplies.
Is it good practice to use table form in PSpice?
Even though the real circuit may not operate at such voltages, there is nothing to prevent PSpice from finding an unrealistic solution at a high voltage. In general, it is good practice to use the TABLE form to limit the output of devices. For example, here is a constant-power load:
What does A and B represent in PSpice?
Where A and B represent the positive and negative terminal nodes of the voltage source V2. This represents a linear conductance with a value of 1 milli-ohm (that is, a 1m ohm resistor). The controlling nodes are the same as the output nodes.