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From SPICE to PSPICE
SPICE: – Engineering design tool for circuit simulation
– SPICE developed in 1970’s by University of California, Berkeley (entirely text-based initially)
PSPICE: – Adapted version of SPICE developed by Microsym in 1984
– A graphical user interface called “Schematics” was added
– Schematics was improved and renamed as “Capture” by Orcad who acquired Microsym later.
Sources of PSpice software
Cadence Orcad PSpice: – Demo versions of the software can be
downloaded free from
http://www.cadence.com/products/orcad/pages/downloads.aspx
– Rooms 3204, 3208, 3203 and 3505 in Nguyen
Engineering Building also have full versions of PSpice installed.
Installation from Cadence Website
• Extract all files from the downloaded folder • Locate and run setup.exe from
….\16.6_OrCAD_Lite_All_Products\Lite Full\Disk1
Circuit Schematics & Simulation using PSpice
Start a Project
Draw a Schematic
Simulate Circuit
Graph Data
Remember
• Create a new project by using the Analogue or Mixed A/D setting
• Use Pspice subfolder inside the Library folder to add your required libraries
• Every circuit should have a PSpice ground
2. Draw a Schematic Part Part Name Schematic
DC Source VDC / Source
Ground (ref. voltage) 0 / SOURCE
Resistor R / ANALOG
Capacitor C / ANALOG
Inductor L / ANALOG
Table 1. Summary of commonly used Parts
2.1 Adding Parts to your Circuit
• Go to Place > Part
• To add a library, click on
the icon shown below
Add library icon
2.3 Connect wires
• To connect wires choose Place Wire (W) • Drag cursor from one connection point to another. Clicking on any valid connection will end the wire • Continue connecting the rest of the circuit
Types of Simulation
– AC Sweep • Commonly known as frequency response • Used to simulate a circuit with AC source at different
frequencies
– DC Sweep • Used when it is required to vary the value of a source or a
parameter of the circuit • Can provide a starting value, ending value and increment
size
– Bias Point Analysis (DC) • Used to calculate all node voltages and currents
– Time Domain (Transient) • Used to run the circuit for a specified amount of time
3. Simulate Design
• To get a curve between voltage V and current I, perform the following steps
– Go to PSpice > New simulation profile
4. Graph Data
• After adding Current marker to your schematic, click run and view simulation results to view the graph.