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Introduction to SPICE

Introduction to SPICE. EEL102. Spice – Introduction. Spice is a short form of : S imulated P rogram with I ntegrated C ircuit E mphasis Used for circuit analysis Many varieties of SPICE – WINSPICE, PSPICE, HSPICE…. Download instructions.

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Introduction to SPICE

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  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 @ http://www.electronicslab.com/downloads/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 -> Last Line of code • Comment within a line should be followed by ; • Comment lines start with *

  7. Circuit elements • Resistor: • R<name> <node1> <node2> <value> • Rx1 4 5 100k • Capacitor: • C<name> <node1> <node2> <value> • C1 3 9 10u • Inductor: • L<name> <node1> <node2> <value> • Lxy 4 5 1m

  8. Voltage and current sources • 3 types : DC, AC, Transient • Voltage Sources: • V<name> <+venode> <-venode> [[DC] <value>] [[AC] <mag> <phase>] [transient + specs] • Current Sources: • I<name> <+venode> <-venode> [[DC] <value>] [[AC] <mag> [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 • V<name> <+node> <-node> 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 • V<name> <+node> <-node> 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)

  10. Dependant Sources • Ebar    17   8   42   18    24.0; VCVS • E<name> <n+> <n-> <nc+> <nc-> <multfactor> • Glab  23   17     8     3    2.5 ; VCCS • G<name> <n+> <n-> <nc+> <nc-> <mult.factor> • Hvx  20  12  Vhx       50.0 ; CCVS • H<name> <n+> <n-> <Vmonitor> <mult.factor> • Ftrn   81   19   Vctl         50.0 ; CCCS • F<name> <n+> <n-> <Vmonitor> <Gain>

  11. Analysis • DC Analysis: • .DC <source> <vstart> <vstop> <vincr> [src2 start2 stop2 incr2] • .DC Vds 0 10 0.5 Vgs 0 5 1 • AC Analysis: • .AC <sweeptype> <ptsvalue> <startfreq> <end freq> • Sweep is either LIN, OCT, DEC • .AC  DEC  20       1Hz   10kHz • .AC  LIN  11       100   200; • Transient Analysis • .Tran <print step> <final time> • .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/Pspicetutorial.pdf • http://cobweb.ecn.purdue.edu/~ee255/lecturesupp_files/PSpice-Tutorial.pdf • http://www.ecircuitcenter.com/AboutSPICE.htm

  15. THANK YOU!!! Questions?

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