PSPICE Software guide

Microelectronic Circuits PSpice Assignment Guide ECE/EEE/EIE Branch

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Ques. 1 Make the following circuit

The solution is mentioned in the question.


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Ques. 2 Make the following circuit

Go to Pspice> New Simulation Profile

Select DC Sweep and tick the following options -1. Primary Sweep2. Parametric Sweep3. Temperature (Sweep)

Then, change the following values >


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Click OK After you press the run command>


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Go to Trace> Add Trace Add the curve for Ic (Q2) (Q2 - The number of the transistor you have used) You'll get a curve like this -


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Under the Semantic, go to Simulation > Edit Profile (for editing the simulation profile made

before)

Run again. You'll get a curve like this-


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Ques. 3

Make the following circuit -

Go to Pspice> New Simulation Profile Click Bias Point Analysis in the dialog box that opens Run the Simulation.


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Ques. 4

Make new simulation profile and use AC sweep for the analysis. A dialog box appears, as

shown -


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Click OK and Run the simulation. Semantic dialog box will open with a plane graph as shown -


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Now,

The final graph (For finding the magnitude of voltage gain) after adding trace - (NOTE - Addition of trace might not be necessary. You might just directly get the graph on

running).


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Now, for finding the phase of voltage -


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Run the Simulation and see the graph -

Now, for finding the TRANSIENT RESPONSE -


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Now, create a new simulation profile for Transient analysis with the following values -

The graph for transient response at the output is -


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Now, for the graph of transient response at collector, change the probe as -

Run the simulation and see the graph -

(Almost the same as the first one).


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Ques. 5 Construct the circuit as shown in the figure -

(This is the same circuit as in question 4, except that it is used for Bias point analysis, meaning that we basically want the values of various parameters used in our circuit. So, for that, by standard procedure, the DC sources are removed and Capacitors are short circuited.)

Now, Make a new simulation profile and Select Bias Point analysis in the dialog box that opens.


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Now, we have the values. Next, make the following circuit in which - 1. We replace BJT by its High Frequency model (present in the textbook) 2. Calculate the values of the Circuit parameters (i.e, the variables used in the following circuit)

(using the formulas from the textbook) 3. Use those values in the circuit and go further.


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All of the above was done to find this small signal equivalent circuit. Now, using this circuit, we have to repeat whatever was done in question 4. For AC SWEEP, Create a new simulation profile and select AC Sweep in it.

Make the adjustments as shown in the figure.


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Click OK and run the simulation. The figure will be now showing the values as shown, and, a new window will open for

Semantic, having a blank graph.


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Now, put the probe at the collector side and right click the wire to note the value of the node, to be used in the graph.


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Do the AC analysis on the equivalent circuit. Then, solve question 4 in the same way. The required graph for AC Sweep is as shown -

Now, changing the position of the probe and plotting another graph, as shown -


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Run the simulation to get the following graph -

Now, finding for the TRANSIENT RESPONSE


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Now, create a new simulation profile for Transient analysis.


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Click OK and Run the simulation. We get the following graph -

Next, change the position of the probe to get the final graph as shown -


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Done.


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Ques. 6 Make the following circuit -

(reference - Sedra and Smith 5th edition) (International version - pg. 356-358 Adopted version - pg. 451-453)


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A dialog box opens. It is edited as shown -


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Save changes to the library you have just edited. (with any name) Go to Pspice, New Simulation Profile. In the dialog box that opens, click on BIAS point analysis (to check that the MOSFET) is

properly biased. Now, Run the Simulation. Next, make another new Simulation Profile for the AC Analysis.


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Run the simulation and add the trace as told above. We get the following graph -


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Ques. 7 Just like it was done for Ques. 5, now, we again have to make the small signal equivalent of the

circuit in Question 6. For that, we first of all do the BIAS POINT ANALYSIS of the circuit (with DC Sources removed

and capacitor SC). Then, we replace the MOSFET with a high frequency model and solve for all the parameters

used in the circuit (using the formulas from the textbook). Bias Point Analysis Circuit -


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Make a new simulation profile for Bias Point Analysis and Run the simulation. The following circuit is got -

Now, making the small signal equivalent circuit for Frequency response of the CS Amplifier -


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Make a new simulation profile and run the program.

A blank graph is obtained. Now, to add trace to it, go to the following wire and note the value of the node. That has to be

added as a trace.


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Plotting gives the final graph -


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