EEL102

1
Introduction to SPICE

• EEL102

2
Spice Introduction

• Spice is a short form of
• Simulated
• Program with
• Integrated
• Circuit
• Emphasis
• Used for circuit analysis
• Many varieties of SPICE WINSPICE, PSPICE,
  HSPICE.

3
Download instructions

• Student Version _at_ http//www.electronicslab.com/do
  wnloads/schematic/013/

4
INSTRUCTIONS for running
5
Steps before running the simulation

• Draw the circuit and Label all nodes and elements
• Circuit described in terms of its elements and
  properties

6
Syntax rules

• Not case-sensitive
• First line of code is ALWAYS the TITLE and
  ignored
• .End -gt Last Line of code
• Comment within a line should be followed by
• Comment lines start with

7
Circuit elements

• Resistor
• Rltnamegt ltnode1gt ltnode2gt
  ltvaluegt
• Rx1 4 5 100k
• Capacitor
• Cltnamegt ltnode1gt ltnode2gt
  ltvaluegt
• C1 3 9 10u
• Inductor
• Lltnamegt ltnode1gt ltnode2gt
  ltvaluegt
• Lxy 4 5 1m

8
Voltage and current sources

• 3 types DC, AC, Transient
• Voltage Sources
• Vltnamegt ltvenodegt lt-venodegt DC ltvaluegt
• AC ltmaggt ltphasegt
• transient specs
• Current Sources
• Iltnamegt ltvenodegt lt-venodegt DC ltvaluegt
• AC ltmaggt phase
• transient specs
• DC source
• V1 3 0 5
• V1 3 0 DC 6
• AC source
• V1 3 0 AC 25 180

9
Transient Sources

• Pulse
• Vltnamegt ltnodegt lt-nodegt PULSE(V1 V2 Td Tr Tf Tw
  Period)
• V1 Value when pulse is not on
• V2 Value when pulse is fully on
• Td Time delay can be zero
• Tr Rise Time Zero causes some simulation
  problems
• Tf Fall time
• Tw Pulse Width
• Period Total time in seconds of pulse
• Ex Vs 1 0 PULSE(0V 10V 0s 100ms 100ms 900ms 2s)
• Sin Damped Sine
• Vltnamegt ltnodegt lt-nodegt SIN(V0 Va fr Td Df theta)
• V0 DC Offset value
• Va Undamped amplitude. Peak measured from zero
  if no DC offset
• fr frequency in Hz
• Td time delay in seconds
• Df Damping factor
• Theta Phase advance in degrees
• Ex Vs 1 0 SIN(2V 5V 2Hz 200ms 2Hz 30d)

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Dependant Sources

• Ebar    17   8   42   18    24.0 VCVS
• Eltnamegt ltngt ltn-gt ltncgt ltnc-gt ltmultfactorgt
• Glab  23   17     8     3    2.5 VCCS
• Gltnamegt ltngt ltn-gt ltncgt ltnc-gt ltmult.factorgt
• Hvx  20  12  Vhx       50.0 CCVS
• Hltnamegt ltngt ltn-gt ltVmonitorgt ltmult.factorgt
• Ftrn   81   19   Vctl         50.0 CCCS
• Fltnamegt ltngt ltn-gt ltVmonitorgt ltGaingt

11
Analysis

• DC Analysis
• .DC ltsourcegt ltvstartgt ltvstopgt ltvincrgt src2
  start2 stop2 incr2
• .DC Vds 0 10 0.5 Vgs 0 5 1
• AC Analysis
• .AC ltsweeptypegt ltptsvaluegt ltstartfreqgt ltend freqgt
• Sweep is either LIN, OCT, DEC
• .AC  DEC  20       1Hz   10kHz
• .AC  LIN  11       100   200
• Transient Analysis
• .Tran ltprint stepgt ltfinal timegt
• .TRAN 1n 1000n

12
OUTPUT

• Text Output
• .PRINT
• Graph Output
• .PROBE command generates a .dat file

13
Example

• Firstorder lowpass Rcfilter
• Vin 1  0 AC 1.0V
• Rf  1  2 1.59
• Cf  2  0 100uF
• .AC DEC 20 100Hz 100kHz
• .PROBE
• .END

14
References

• http//www.uta.edu/ee/hw/pspice/
• http//www.engr.colostate.edu/ECE562/Pspicetutoria
  l.pdf
• http//cobweb.ecn.purdue.edu/ee255/lecturesupp_fi
  les/PSpice-Tutorial.pdf
• http//www.ecircuitcenter.com/AboutSPICE.htm

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THANK YOU!!! Questions?