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AC simulation and Bode Plots – 320L Build the circuit shown. Below the circuit is a list of the parts that were used and the libraries that they belong to. It is important that you pay attention to which library you get the parts from. If you are running the simulation at home using the student version the libraries will be different. The parameter Vac should be set to one. Vcc Vcc R3 V2 R2 94.5K Q1 C1 8\Vdc 4K Vout Vin V1 0 100u 0Vdc 1Vac TRAN = Q2N2222 R4 R1 28.3K 1k 0 Note that nodes which have the same name are connected Part Part name R Q2N2222 Vdc Library if you are at school ANALOG BIPOLAR SOURCE Library if you are using the student version at home ANALOG EVAL SOURCE resistor BJT DC voltage source capacitor C ANALOG ANALOG You can paste Pspice schematics into Word and Power point documents as well as other Pspice documents. This is done with standard cut and paste commands. To include the diagram in a document. Select the circuit Hit Ctrl-C (to copy to the clip board) Hit Ctrl-V to paste the circuit in the destination document AC simulations can be used to generate Bode plots. To perform an AC simulation From the main menu: Pspice->New Simulation (or Edit Simulation) If you have typed new simulation: Enter a name for your simulation and hit <create> You will see the menu below Select AC Sweep/Noise as an analysis type Hit <OK> You will see the window below Enter starting and ending frequencies. IMPORTANT: the start frequency must not be zero To simulate: from the main menu: Pspice->Run A Blank window will appear To plot the amplitude of the waveform from the main menu select: Trace-> Add Trace The window shown below will appear. On the left are all the waveforms that are available to plot. On the right are the functions that can be performed on the waveforms. For our simulation we name the output Vout so we select V(Vout). If we had forgotten to name the node we could access the same waveform V(Q1:c) the collector voltage of transistor Q1. Currents can also be plotted. IB(Q1) is the base current flowing into transistor Q1. Hit <OK> to plot To plot decibels select the function DB() To plot phase select function P() To plot input impedance plot: 1/IB(Q1) To determine precise values from a simulation use cursors From the main menu select: Trace->Cursor->Display There are two cursers cursor A1 is affiliated with the left mouse key and cursor A2 is affiliated with the right mouse key Pressing you left our right mouse key down you can slide the cursor crosshair along a waveform The x and y data values at the position of the crosshair are displayed in the probe cursor window Click with left mouse to affiliate this trace with the left mouse cursor To include a printout of the simulation From the main menu: Window->Copy to clipboard This plot is copied to the clipboard and can be pasted into a document using ctrl-V