Laboratory Manual - King Fahd University of Petroleum and Minerals
Laboratory Manual - King Fahd University of Petroleum and Minerals
Laboratory Manual - King Fahd University of Petroleum and Minerals
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Adder Circuit Simulation<br />
* Statement for square wave input<br />
* TD<br />
VSQ 1 0 PULSE(0 5 0 0.1p 0.1p 0.5m 1m)<br />
*Statement for triangular wave input<br />
VTR 5 0 PWL(0 0 0.25m 1 0.75m -1 1.25m 1 1.75m -1<br />
+2.25m 1 2.75m -1)<br />
R1 1 2 1K<br />
R2 5 2 1K<br />
RF 2 6 1K<br />
* Calling the op amp subcircuit.<br />
X1 2 0 6 OPAMP<br />
*op amp subcircuit<br />
.SUBCKT OPAMP 10 20 30<br />
RIN 20 10 1MEG<br />
* Voltage controlled voltage source<br />
EOUT 30 0 20 10 5E4<br />
.ENDS<br />
.TRAN 0.01m 2m 0<br />
.PROBE<br />
.END<br />
Notes:<br />
1. Nodes 2, 0, <strong>and</strong> 6 in basic circuit will be assigned<br />
to nodes 10, 20, <strong>and</strong> 30 in the subcircuit,<br />
respectively.<br />
2. General format for Voltage controlled voltage<br />
source is: Ename N1 N2 NC1 NC2 Value<br />
In the example, it is specified with positive node 30,<br />
negative node 0 while nodes 20 <strong>and</strong> 10 being the<br />
possitive <strong>and</strong> negative nodes <strong>of</strong> the controling<br />
volatge. The value <strong>of</strong> the controlling constant is 5E4.<br />
Requiremnt:<br />
Change the input file such that the two<br />
inputs are not synchronized. This can be<br />
achieved by changing TD <strong>of</strong> the pulse from<br />
0 to 0.1ms <strong>and</strong> run the program again.<br />
Figure 5: SPICE file for the adder circuit<br />
You must have your SPICE output file with your h<strong>and</strong> calculations ready before<br />
you come to the lab.<br />
EXPERIMENTAL WORK<br />
See pin configurations <strong>of</strong> 741 op amp in the data sheet given in the Appendix at the end<br />
<strong>of</strong> the manual.<br />
Also, note when testing the adder <strong>and</strong> difference circuits that the two input are not<br />
synchronized <strong>and</strong> hence be careful when you plot the results.<br />
1. Construct the voltage buffer circuit shown in Figure 1. Apply a sine wave <strong>of</strong> 1V <strong>and</strong><br />
frequency <strong>of</strong> 1kHz. Monitor the input <strong>and</strong> output wave forms <strong>and</strong> sketch the output<br />
in Table I.<br />
2. Repeat step 1 for the inverting amplifier.<br />
3. Construct the adder circuit. In this case, two inputs are need. Generate the triangular<br />
signal normally from the function generator whereas use its SYNC output to<br />
provide the square wave input. Note that square wave varies from 0 to 5V <strong>and</strong> its<br />
amplitude cannot be changed. Sketch the output in Table I. Be careful when you<br />
plot the results the two inputs may not be synchronized.<br />
4. Construct the inverting integrator. Apply a square wave normally from the signal<br />
generator <strong>of</strong> 1V <strong>and</strong> frequency <strong>of</strong> 1kHz. Monitor the input <strong>and</strong> output wave forms<br />
<strong>and</strong> sketch the output in Table I.<br />
5. Test your design <strong>of</strong> the prelab <strong>and</strong> sketch the output in Table I<br />
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