1. Introduction to PSpice
Modul week 7
Introduction to PSpice

2. Introduction SPICE = Simulation Program for Integrated Circuit.
Industrial based simulation.
Same function as Multisim. PSpice is used to simulate
Analog circuit
Digital circuit
Mixed signal circuit

3. Types of circuit analysis
DC analysis(DC transfer curve)
Transient analysis(Output as a function of time)
AC analysis(Output as a function of frequency)
Noise analysis
Sensitivity analysis
Distortion analysis
Fourier analysis
Monte Carlo analysis

4. Steps in simulating a circuit
Figure: The steps involved in simulating a circuit with PSpice.

5. Values of elements T or Tera (= 1E12) G or Giga (= E9)
MEG or Mega (= E6)
K or Kilo (= E3)
M or Milli (= E-3)
U or Micro (= E-6)
N or Nano (= E-9)
P or Pico (= E-12)
F of Femto (= E-15)

6. LAB 5: PSPICE FOR DC ANALYSIS
Experiment involved:
4.1 Basic DC Nodal Analysis
5.1 Basic DC Sweep Analysis
5.2 Diode I-V Characteristic
5.3 Maximum Power Transfer

7. Basic DC Nodal Analysis
4.1
Basic DC Nodal Analysis

8. How to start?
STARTAll ProgramsMicroSim Eval 8Schematics

9. Step 1: Creating the circuit in Capture
1. Create new project:
Figure: Schematic windows and toolbars

10. 2. Place the components and connect part
DrawGet new Part..
Figure: Place part window

11. Example: Complete connection
VIEWPOINT
BUBBLE
IPROBE
Figure: Bias point detail simulation

12. Step 2: Specifying the type of analysis and simulation
AnalysisSetup
For all analysis selected except Bias Point Detail, click on the function button to fill in all the requirements.
Figure: Analysis Setup Dialog Box

13. Step 3: Create netlist
AnalysisCreate netlist
(Nothing will appear)

14. Step 4: Run the simulation
AnalysisSimulate
Figure: Simulated circuit

15. Step 5: Examine the netlist
AnalysisExamine netlist (To show the node names, position of each component and value of each component).
Figure: Schematic netlist

16. Step 6: To examine the content of the output file
AnalysisExamine Output (Print out)
Figure: Content of output file

17. Step 6: To examine the content of the output file (Continue)
Schematic netlist
Schematic aliases

18. Step 6: To examine the content of the output file (Continue)
Date and time of simulation
Voltage drop at each node
Current flow at Vx and V2
Aliases

19. 5.1 Basic DC Sweep Analysis
Adds more flexibility
Allow DC sources to change voltages or current.
Eg: From previous simulation, 15V VDC will produce a 97.26mV Vo. But for this experiment, the input VDC is varied from 0-25V and a range of Vo is produced.

20. DC Sweep Analysis Circuit
1. Build the circuit
Vx = 0 – 25V

21. DC Sweep Analysis Circuit (Continue)
2. AnalysisSetup

22. DC Sweep Analysis Circuit (Continue)
3. Double click DC Sweep button.
Select voltage source
Select linear type
Range of Vx = 0-25V with increment 1V

23. DC Sweep Analysis Circuit (Continue)
4. AnalysisExamine netlist
5. AnalysisSimulate

24. DC Sweep Analysis Circuit (Continue)
6. Microsim Probe

25. DC Sweep Analysis Circuit (Continue)
7. From the microsim probe, click TraceAdd

26. DC Sweep Analysis Circuit (Continue)

27. 5.3 Maximum Power Transfer
Maximum Power Transfer Theorem
- To obtain maximum power from a source with a fixed internal resistance, the resistance of the load must be made the same as that of the source.

28. Maximum Power Transfer (Continue)
1. Wire the following circuit
Figure: The schematic circuit

29. Maximum Power Transfer (Continue)
2. Double click RL and set the value of RL as {RL_val}

30. Maximum Power Transfer (Continue)
3. Double click PARAMETERS
We would like to vary the value of RL. To do this we need to define the value of RL as a parameter. Type the text {RL_val} on the set attribute value for resistor RL.

31. Maximum Power Transfer (Continue)
4. AnalysisSetup. Enabled DC sweep.
Select Global Parameter because we are varying RL_val
Number of points to plot

32. Maximum Power Transfer (Continue)
5. Simulate. If there is no error, the Microsim Probe window will appear.

33. Maximum Power Transfer (Continue)
6. Add trace

34. Maximum Power Transfer (Continue)
Output in linear form

35. Maximum Power Transfer (Continue)
Output in log form. Change x-axis setting to log form. PlotX Axis-SettingScaleLog

36. Maximum Power Transfer (Continue)