Modul week 7

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 Analysis5.1 Basic DC Sweep Analysis5.2 Diode I-V Characteristic5.3 Maximum Power Transfer

4.1

Basic DC Nodal Analysis

How to start?

STARTAll ProgramsMicroSim Eval 8Schematics

Step 1: Creating the circuit in Capture

1. Create new project:

Figure: Schematic windows and toolbars

2. Place the components and connect part

DrawGet new Part..

Figure: Place part window

Example: Complete connection

Figure: Bias point detail simulation

VIEWPOINT

IPROBE

BUBBLE

Step 2: Specifying the type of analysis and simulationAnalysisSetup 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

AnalysisCreate netlist

(Nothing will appear)

Step 4: Run the simulation

AnalysisSimulate

Figure: Simulated circuit

Step 5: Examine the netlist

AnalysisExamine 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

AnalysisExamine 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 nodeCurrent flow

at Vx and V2Aliases

5.1Basic DC Sweep Analysis

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. AnalysisSetup


3. Double click DC Sweep button.

Range of Vx = 0-25V with increment 1V

Select voltage source

Select linear type


4. AnalysisExamine netlist5. AnalysisSimulate


6.Microsim Probe


7. From the microsim probe, click TraceAdd

5.3Maximum 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


2. Double click RL and set the value of RL as {RL_val}


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.


4. AnalysisSetup. Enabled DC sweep.

Select Global Parameter because we are varying RL_val

Number of points to plot


5.Simulate. If there is no error, the Microsim Probe window will appear.


6. Add trace


Output in linear form


Output in log form. Change x-axis setting to log form. PlotX Axis-SettingScaleLog

Modul week 7

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