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LT SPICE Tutorial
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Getting Started
• Download LTSPICE IV fromhttp://www.linear.com/deigntool/oftware/
• Download the !."#um li$rar% &le 'log!"#.l() *cop% it to C:+Program ,ile+LTC+LTpiceIV+li$+cmp
• -pen the .l li$rar% &le in LTSPICE * change the
li$rar% path in all the .li$ de&nition to C:+Program ,ile+LTC+LTpiceIV+li$+cmp+log!"#.l
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LTSPICE: Schematic
• Go to ,ile01ew Schematic
• Include the li$rar% &le $% uing a SPICE directi2e 3
.li$ 'C:+Program,ile+LTC+LTpiceIV+li$+cmp+log!"#.l( TT
• Go to Edit0Component and inert the followingcomponent in the chematic
nmo4 3 15-Spmo4 3 P5-S
2oltage 3 Voltage ource
6
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LTSPICE: Schematic
• 7ight clic8 on 15-S * P5-S and edit the model name from15-S/P5-S to nch and pch) repecti2el%
• Enter rele2ant parameter for tranitor9)L and 5; ignore<D) <S) etc for now= and 2oltage ource
• Go to Edit0Draw ire and connect all the component
• Go to Edit0Place G1D and place the ground in the circuit
•
Go to Edit0La$el 1et and la$el all the net name %ou mightwant to plot later 9ma8e life eaier=
• To name a 2oltage ource) right clic8 on it name and edit
• Go to Simulate0Control Panel01etlit option) and unchec8
Default model and default li$rarie 4
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LTSPICE: DC anal%i
• Go to Edit0SPICE <nal%i0DC weep) and enterthe following 3
1ame of "t
Source to Sweep: Vgn T%pe of Sweep: Linear
Start Value: !
Stop Value: ".#
Increment: !.!
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Pre 7un
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LTSPICE: Simulation 7eult
• Succeful imulation open a .raw &le in anotherwindow
•
<ll the plot are a2ed in thi .raw &le
• To plot) 7ight clic8 on the plot area * electVii$le Trace
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LTSPICE: DC Simulation 7eult
• To plot gain) 7ight clic8 on the plot area * elect<dd Trace
•
Be d9= to calculate the deri2ati2e of the rele2antcur2e w.r.t the wept 2aria$le
• ,or complete lit of mathematical operation) go
to elp0elp Topic0a2eform <rithmetic
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LTSPICE: DC op pnt anal%i
• Calculate DC operating point of the circuit
• Go to Edit0SPICE <nal%i0DC op pnt
• Succeful imulation open a lit of all node 2oltageand current in the circuit
• To annotate node 2oltage on the chematic) rightclic8 on the chematic and elect View0Place .op
Data La$el and elect the deired net
• To 2iew the detailed operating point of the tranitor)go to View0SPICE Error Log
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LTSPICE: <C anal%i
• 7ight clic8 on Vin) Select <d2anced and ma8e <Camplitude"
•
Go to Edit0SPICE <nal%i0<C anal%i) andenter the following 3
T%pe of Sweep: Decade
1um$er of point per decade: !Start ,reuenc%: "8
Stop ,reuenc%: "!!G
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LTSPICE: Tranient anal%i
• 7ight clic8 on Vin) Select <d2anced) Select Sineunder ,unction * enter the following parameter3
DC -Fet !) <mplitude ".>m) ,re "!!5eg
• Go to Edit0SPICE <nal%i0Tranient anal%i)and enter the following 3
Stop Time: #!n
"4
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LTSPICE: Parametric anal%i
• Bed to run imulation for diFerent 2alue of a deign2aria$le
• 7ight clic8 on Vin) Select <d2anced) Select Sine under,unction * enter the following parameter 3
DC -Fet !) <mplitude VinH) ,re "!!5eg
• <dd the parameter de&nition $% uing the SPICE directi2e 3.param Vin ".>m
•
Sweep Vin $% uing the SPICE directi2e 3.tep param Vin lit ".>m >m >!m "!!m
• ,or diFerent 8ind of parameter weep) go to elp Topic0.STEP
ref: http://we$.cec.pd.edu/Jpraad/LTSpiceK!SweepK!Tutorial.pdf ">
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LTSPICE: ,,T anal%i
• Go to Edit0SPICE <nal%i0Tranient anal%i) and enter thefollowing 3Stop Time: #!n5aimum time tep: @.#">p
•
<dd SPICE directi2e .option matep@.#">p
• Go to Simulate0Control Panel0SPICE) and enter the followingtolerance 2alue 3<$tol: "e!">) 7eltol: !.!!!") Voltol: "e!!A
• Go to Simulate0 Control Panel0Compreion 3 Bnchec8 allt%pe of compreion
7ef: aic <nalog C5-S Deign: <n intuiti2e approach) $% Mlaa ult
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LTSPICE: ,,T anal%i
• 7un the imulation and in the plot window) go to View0,,T
• Select the rele2ant wa2eform) and enter the following
etting1um$er of data point ample in time: "!4
Time range to include0Specif% a time range
Start time: !
End time: #!n
inomial Smoothing done $efore ,,T and windowing1um$er of point: "
indowing
indowing function: 9none=
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LTSPICE: ,,T anal%i
• The ,,T i plotted with a logarithmic ai
• ,or a $etter plot) clic8 on the ai) unchec8
logarithmic and enter the following ai limit 3Left: ".>5N
Tic8: ".>5N
7ight: 6.GN
• Tr% to plot the ,,T of Vin &rt to ma8e ure theetup i correct
"#
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5ic.
• Shortcut
Draw wire ,6
Component ,
5o2e ,@
La$el 1et ,4
SPICE Directi2e
Place G1D g
Cop% ,? or CtrlOC7otate ,@0elect o$ect0CtrlO7
Qoom to &t Space
Bndo ,A
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5ic.
• To pate plot in word document) Tool0Cop%$itmap to clip$oard
,urther 7eading
• ,,T etup : aic <nalog C5-S Deign: <n intuiti2e approach) $%
Mlaa ult
•LTSPICE :
• rief http://www.ece.uidaho.edu/ee/clae/ECE""/pdf/LTSpiceRaicRTutorial.pdf
• Detailed http://ltpice.linear.com/oftware/cad6.pdf
• http://denethor.wlu.ca/ltpice/!