This document provides an overview of PSPICE, a circuit simulation software. It describes how PSPICE can be used to simulate analog circuits, analyze circuit behavior, and visualize output through graphical plots. Key features of PSPICE include its ability to simulate circuit components like resistors, capacitors, transistors, and operational amplifiers. It also allows various types of circuit analyses, including DC, AC, transient, and Fourier analyses. The document provides examples of basic PSPICE commands and syntax for defining circuit elements and performing simulations.

1. NAGPUR INSTITUTE OF TECHNOLOGY,NAGPUR
DEPARTMENT OF COMPUTER SCI.&
ENGINEERING
MASTERS OF ENGINEERING
In
Embedded system & Computing
SESSION 2013-2014
M.E.- II SEMESTER
A
Presentation On
“PSPICE”
By:
Ms. Ayushi S. Jaiswal
Guided By:
Prof. Shubhangi Borkar
(Computer Sci.& Engineering)

2. Introduction to PSPICE
 Simulation Program with Integrated Circuit
Emphasis
◦ Developed in 1970’s at Berkeley
◦ Many commercial versions are available
◦ HSPICE is a robust industry standard
 SPICE is a general purpose analog circuit simulator
that is used to verify circuit designs and to predict
the circuit behaviour.
 PSpice is a PC version of SPICE that runs on
workstations and larger computers.

3. PSPICE Overview
 OrCAD PSpice simulates analog-only circuits.
 After we prepare a design for simulation,
OrCAD Capture generates a circuit file set.
 The circuit file set, containing the circuit
netlist and analysis commands, is read by
PSpice for simulation.
 PSpice formulates these into meaningful
graphical plots, which you can mark for
display directly from your schematic page
using markers.

4. Circuit Components available
 Independent and dependent voltage and current sources
 Resistors
 Inductors
 Mutual inductors
 Transmission lines
 Operational amplifiers
 Switches
 Diodes
 Bipolar transistors
 MOS transistors
 JFET
 MOSFET
 Digital gates

5. PSPICE Elements
Elements & their denoted letter.
Letter Element
R Resistor
C Capacitor
L Inductor
K Mutual Inductor
V Independent voltage source
I Independent current source
M MOSFET
D Diode
Q Bipolar transistor
W Lossy transmission line
X Subcircuit
E Voltage-controlled voltage source
G Voltage-controlled current source
H Current-controlled voltage source
F Current-controlled current source

6. PSPICE Units
Letter Unit Magnitude
a atto 10-18
f fempto 10-15
p pico 10-12
n nano 10-9
u micro 10-6
m milli 10-3
k kilo 103
x mega 106
g giga 109

7. Types of Analysis run with
PSpice
DC sweep & other DC calculations.
AC sweep and noise.
Transient and Fourier.
 Parametric and temperature.
Sensitivity/worst-case.
 Non-linear DC analysis.
 Non-linear transient analysis.
 Linear AC Analysis.
 Noise analysis .
 Sensitivity analysis.
 Distortion analysis.
 Fourier analysis.
 Monte Carlo Analysis.

8. Things to remember before
starting
PSPICE is not case sensitive.
 All element names must be unique.
 There must be a node designated "0" (Zero).
This is the reference node against which all
voltages are calculated.
 If any change is made in circuit make sure you
create netlist again before simulating it.

9. Startup and Basic Syntax
 Start  Programs  Orcad Release 9.2  Pspice
 File  New  Text file
 5 different “commands”
you can use
o Title: first line of code (always)
o .END: last line of code (always)
o Comment: line denoted by *
o Element: Resistor, capacitor, etc.
o Control: analysis

10. Basic steps in creating and
analyzing a circuit using PSPICE
File New Project Analog or Mixed A/D
When the New Project box appears, specify the following:
• Assign the project a Name (any name is fine)
• Create project using Analog or Mixed A/D
• Pick the Location

11. Passive Component
Description & Source design
 Resistor
o R<name> <node1> <node2> <value>
o Ex. R1 1 2 100
o Names should not contain comma, space, or =, or parenthesis
 Capacitor
o C<name> <node1> <node2> <value>
o Ex C3 3 0 1uF
 Inductor
o L<name> <node1> <node2> <value>
 Independent Voltage Source
o V<name> <+node> <-node> <dc/ac> <value>
o VCC 10 0 DC 6
 Independent Current Source
o I<name> <+node> <-node> <dc/ac> <value>
o I_in 10 0 AC 3

12. Analysis Types
DC Analysis
DC transfer curve source and sweep
.dc <source> <vstart> <vstop> <vincr> [src2 start2 stop2 incr2]
.DC VIN 0.25 5.0 0.25
AC Analysis
.AC DEC ND FSTART FSTOP
Dec = decade variation, ND = pts. / decade
.AC LIN NP FSTART FSTOP
Lin = linear variation, NP = # pts
.NOISE OUTV INSRC NUMS
OUTV = output voltage which defines summing point
INSRC = name of independent source which is the noise input
reference
NUMS = summary interval
Transient
(.tran <step> <stop> <start>)
Transient analysis computes the transient output variables as a function
of time over a user specified time interval
The initial conditions are automatically determined by a dc analysis
.tran 1ns 1000ns 500ns

13. Including our own model files
 .model <name> <type> <parameters….>
 .model QPNP PNP(Is=650.6E-18 Xti=3
Eg=1.11 Vaf=100 Bf=150 Ne=1.829 + Ise=54.81f
Ikf=1.079 Xtb=1.5 Br=3.563 Nc=2 Isc=0 Irk=0
Rc=.715 + Cjc=14.76p Mjc=.5383 Vjc=.75
Fc=.5 Cje=19.82p Mje=.3357 Vje=.75 +
Tr=111.3n Tf=603.7p Itf=.65 Vtf=5 Xtf=1.7 Rb=10)
 .model QNPN NPN(Is=14.34f Xti=3 Eg=1.11
Vaf=100 Bf=150 Ne=1.307 + Ise=14.34f Ikf=.2847
Xtb=1.5 Br=6.092 Nc=2 Isc=0 Ikr=0 Rc=1 +
Cjc=7.306p Mjc=.3416 Vjc=.75 Fc=.5 Cje=22.01p
Mje=.377 Vje=.75 + Tr=46.91n Tf=411.1p Itf=.6
Vtf=1.7 Xtf=3 Rb=10)

14. Circuit & Code
R3
V1 5k
10Vdc
R5
4k
R4
3k
R6
2k
R2
3k
R1
1k

15. Result

16. Advantages
New PSpice interface with integrated waveform analysis
functionality
 PSpice includes all of Probe’s features and adds to them.
 Included in one screen are tabbed windows for viewing
plots, text windows for viewing output files or other text
files, and a simulation status and message window.
 Also included is a new, self-documenting analysis setup
dialog for creating simulation profiles .
 PSpice now provides an editable simulation queue which
shows you how many files are currently in line to be
simulated. You can edit or re-order the list as needed.

17. THANK YOU