1 / 33

Lecture on PSpice

Lecture on PSpice. Introduction to SPICE. SPICE was originally developed at the University of California, Berkeley (1975). S imulation P rogram for I ntegrated C ircuits E mphasis H SPICE = H igh-performance SPICE  P Spice = P C version of SPICE. SPICE Functions. DC analysis:

benedict-levine
Download Presentation

Lecture on PSpice

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lecture on PSpice

  2. Introduction to SPICE • SPICE was originally developed at the University of California, Berkeley (1975). • Simulation Program for Integrated Circuits Emphasis • HSPICE = High-performance SPICE  • PSpice = PC version of SPICE

  3. SPICE Functions • DC analysis: DC transfer curve • Transient analysis: voltage and current as a function of time • AC Analysis: output as a function of frequency • Noise analysis • and more …. • SPICE has analog and digital libraries for standard components (Transistor, NAND, NOR, …) • Different temperatures • Default temperature is 300K

  4. Components • Independent voltage and current sources • Dependent voltage and current sources • Resistor • Capacitor • Inductor • Operational amplifier • Transistor • Digital gates …

  5. SPICE Source File • Title statement: first line • Data statements: specify the Circuit, components,interconnections • Control statements: specify what types of analysis to perform on the circuit. • Output statements: specify outputs • Comment statements: begin with an asterisk (*) • End statement: .END <carriage return> • "+" sign (continuation sign)

  6. Suffixes • T Tera (10+12) • G Giga (10+9) • MEG Mega (10+6) • K Kilo (10+3) • M Mili (10-3) • U Micro (10-6) • N Nano (10-9) • P Pico (10-12) • F Femto (10-15)

  7. N1(+) N1(+) N2(-) N2(-) Independent DC Sources • Voltage source: Vname N+ N- Type Value • Current source: Iname N+ N- Type Value • Type: DC, AC or TRAN (transient) (like PULSE, …) • Vin 2 0 DC 10 • Vin 2 0 AC 10 • Is 3 4 DC 1.5 • Voltage and Current Conventions

  8. Dependent DC Sources • Voltage controlled voltage source: • Ename N+ N- NC+ NC- Value • Voltage controlled current source: • Gname N+ N- NC+ NC- Value • Current controlled voltage source: • Hname N+ N- Vmeas Value • Current controlled current source: • Fname N+ N- Vmeas Value • N+ and N- are terminals of the dependent source • NC+ and NC- are terminals of the controlling voltage source

  9. N- Vmeas Vmeas N+ Ename N+ N- NC+ NC- α Gname N+ N- NC+ NC- γ Hname N+ N- Vmeas ρ Fname N+ N- Vmeas β

  10. Example F1 0 3 Vmeas 0.5 Vmeas 4 0 DC 0

  11. 3 + 5V 1pF _ 4 Resistors, Capacitors, Inductors • Rname N+ N- Value • Cname N+ N- Value <IC> • Lname N+ N- Value <IC> • IC = initial condition (DC voltage or current) Example: C1 3 4 1pF 5V C2 1 2 2pF L1 3 4 1mH L2 7 3 2mH 1mA

  12. Damped Sinusoidal Sources • Vname N+ N- SIN(VO VA FREQ TD THETA PHASE) • VO - offset voltage in volt. • VA - amplitude in volt. • f = FREQ in Hz • TD - delay in seconds • THETA - damping factor per second • Phase - phase in degrees • If TD, THETA and PHASE are not specified, it is assumed to be zero. Example: V1 1 2 SIN(5 10 50 0.2 0.1) V2 3 4 SIN(0 10 50)

  13. F=1, THETA=.4, VO=5, VA=3, TD=0, Phase=600

  14. Piecewise linear source (PWL) • Vname N+ N- PWL(T1 V1 T2 V2 T3 V3 ...) • Vi is the value source at time Ti •  Example: Vg 1 2 PWL(0 0 10U 5 100U 5 110U 0)

  15. Pulse • Vname N+ N- PULSE(V1 V2 TD TrTf PW Period) • V1 - initial voltage • V2 - peak voltage • TD - initial delay time • Tr - rise time • Tf - fall time • pw- pulse-width • Period - period

  16. Subcircuits • A subcircuit allows you to define a collection of elements as a subcircuit (e.g. an operational amplifier) .SUBCKT SUBNAME N1 N2 N3 ... Element statements . .ENDS SUBNAME • N1, N2, N3 are the external nodes of the subcircuit. The external nodes cannot be 0. • The node numbers used inside a subcircuit are strictly local, except for node 0 which is always global.

  17. Example: µ741 (Op Amp) * Subcircuit for 741 op amp * +in (=1) -in (=2) out (=3) .subckt opamp741 1 2 3 rin 1 2 2meg rout 6 3 75 e1 4 0 1 2 100k r1 4 5 0.5meg c1 5 0 31.85nf eout 6 0 5 0 1 .ends opamp741

  18. Using Subcircuit vs 1 0 dc 5 r1 1 2 200 rf 2 3 1k x1 0 2 3 opamp741 .dc vs 0 10 1 .option post .end

  19. .OP Statement • Instructs SPICE to compute DC operating points • voltage at each node • current in each voltage source • operating point for each element

  20. .DC Statement • Increment (sweep) an independent source over a certain range with a specified step   .DC SRCname START STOP STEP • SRCname = name of the source • START and STOP = starting and ending values • STEP = size of increments • Example: .DC V1 0 20 2

  21. .TRAN Statement • Specifies time interval for transient analysis .TRAN TSTEP TSTOP <TSTART> • TSTEP = increment • TSTOP = final time • TSTART = starting time

  22. .AC Statement • Specify frequency (AC) analysis  .AC LIN NP FSTART FSTOP   • LIN = linear frequency variation • NP = number of points. • FSTART and FSTOP = start and stopping frequencies (Hz)  • Example: .AC LIN 10 1000 2000

  23. Output Statements • .PLOT plots selected output variables, to design.lis using ASCII characters. .PLOT is useful for looking at plotted results without access to AvanWaves. • .PRINT DC V(2) prints node voltage value for node 2 in the design.lis file.

  24. .PRINT & .PLOT • .PRINT TYPE OV1 OV2 OV3 ... • .PLOT TYPE OV1 OV2 OV3 ... • TYPE = type of analysis printed or plotted • DC • TRAN • AC • OV1, OV2 = output variables Examples:  .PLOT DC V(1,2) V(3) I(Vmeas) .PRINT TRAN V(3,1) I(Vmeas)

  25. Example 1

  26. * We are interested in finding the following characteristics: * 1. Node voltages v12, v2 and current i4 when vin=10V * 2. Thevenin equivalent voltage and resistance, seen * at the output terminals v(3,0) VIN 1 0 DC 10 VMEAS 4 0 DC 0 *VMEAS is a 0V source to measure i4 F1 0 3 VMEAS 0.5 R1 1 2 1K R2 2 3 10K R3 1 3 15K R4 2 4 40K R5 3 0 50K .tran .01n 50n .TF V(3,0) VIN .DC VIN 0 20 2 .PLOT DC V(1,2) .END

  27. Example 2

  28. * pulse generator * +node -node V1 V2 TD TR TF PW PER VIN 1 0 PULSE ( 0 5 0 0.1N 0.1N 50N 100N) R1 1 2 10M R2 2 0 10M C1 2 0 1uF * transient simulation for 50ns with 0.01ns step size .tran .1n 500n * dc simulation with stimulus voltage (source VIN) from 0 to 5V in 0.1V steps .DC VIN 0 5 0.01 .end

  29. 5 2 1 - 5V46 10 10 + 10V _ + 3 5 6 5 10 10 10 0 4 5 Example 3 * TheveninVs 1 0 DC 10VE1 3 2 4 6 5R1 1 2 5R2 1 4 5R3 0 4 5R4 3 4 10R5 2 5 10R6 2 6 10R7 5 4 10R8 4 6 10.TF V(5,6) Vs.plot DC V(5,6).plot DC I(Vs).DC Vs 0 100 10.END

  30. Example 4

  31. OLD_HW1_Solution * Thevenin Vs 2 5 DC 100V Vmeas 2 3 DC 0V Fx 6 7 Vmeas 4.0 Ex 2 1 5 4 3.0 R1 3 4 5.0 R2 4 7 5.0 R3 5 4 4.0 R4 7 0 4.8 R5 5 6 1.0 R10 1 0 1MEG .TF V(4,0) Vs .plot DC V(5,4) .plot DC V(1,0) .plot DC I(Vmeas) .DC Vs 0 100 10 .tran 1n 50n 0 .END

  32. Example 5 1 2 0

  33. OLD_HW2_Solution Vs 1 0 AC 1 L1 1 2 1m C1 1 2 1n R1 2 0 10M .AC LIN 10 1000 2000 plot AC V(1,2) I(Vs) .END

More Related