Introduction to PSpice Modul week 7 Introduction to PSpice

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

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

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

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)

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

Basic DC Nodal Analysis 4.1 Basic DC Nodal Analysis

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

DC Sweep Analysis Circuit (Continue) 6. Microsim Probe

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

DC Sweep Analysis Circuit (Continue)

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.

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

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

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.

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

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

Maximum Power Transfer (Continue) 6. Add trace

Maximum Power Transfer (Continue) Output in linear form

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

Maximum Power Transfer (Continue)