hspice-example

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1、HSPICETutorialbyYousofMortazavi(Oct.2004)Defineparameters*Tutorial:CMOSNANDGateCharacterizationFirstlineinaSPICEdeckiswith.param***********defineparameters***********.paramvdd=3.3alwaysacomment(withorCandefineparameter.paramWn=1.0uwithout*).basedonotherparameters+Wp=Wn+Lmin=0.35u

2、orexpressions.+delay=100pFirstvddisthevoltagesource.Use‘+’tocontinuelong*****************definestimulii*********************Secondvddisthenode.vddvdd0vddThirdvddistheparameterlinesontheproceedingVaa_0pulse(0vdd20ndelaydelay40n60n)line.Vbb_0pulse(0vdd10ndelaydelay20n40n)(=3.3V).**

3、***defineglobalnodesforuseinsubcircuits*****.globalvdd***definesubcircuits(modules)*****SubcircuitsareSPICE’s.subcktnandxyoutHere’showyoucandoMp1outxvddvddPW=WpL=Lminwayofdefiningmodules+PD='Wp+6*Lmin'PS='Wp+6*Lmin'arithmeticonyourparameters.repeatedinyourdesign.+AD='3*Wp*Lmin'AS

4、='3*Wp*Lmin'Mp2outyvddvddPW=WpL=Lmin+PD='Wp+6*Lmin'PS='Wp+6*Lmin'+AD='3*Wp*Lmin'AS='3*Wp*Lmin'ThesearethesubcircuitMn1outxnode10NW=WnL=Lmin+PD='Wn+6*Lmin'PS='Lmin'parametersandtheirdefault+AD='3*Wn*Lmin'AS='Wn*Lmin'values,incaseyoudon’tMn2node1y00NW=WnL=Lmin+PD='Wn+6*Lmin'PS='Wn+

5、6*Lmin'specifythemduringYoucanevenparametrize+AD='3*Wn*Lmin'AS='3*Wn*Lmin'instantiation..endsvaluesinyourmoduleandselectthesevalueswhen.subcktinverterinoutstrength=Wnratio='Wp/Wn'Mn1outin00NW=strengthL=Lminyouinstantiateyour+PD='strength+6*Lmin'PS='strength*2+Lmin'module.+AD='3*s

6、trength*Lmin'AS='3*strength*Lmin'Mp1outinvddvddPW='strength*ratio'L=Lmin+PD='strength*ratio+6*Lmin'PS='ratio*strength+6*Lmin'+AD='3*ratio*strength*Lmin'AS='3*ratio*strength*Lmin'.ends*****Abuffermoduleconsistingoftwoinverters.subcktbufferinoutstrength=Wnratio='Wp/Wn'Xinv1inmidinv

7、erterstrength=strengthratio=ratioXinv2midoutinverterstrength=strengthratio=ratio.endsInstantiateWecansweepparametrized*********definemaincircuit******************moduleslikeso.Xbuff1a_abufferstrength='Wn'ratio=1valuesusing‘sweep’.(Xnand1:doesn’tXbuff2b_bbufferstrength='Wn'ratio=1

8、Xnand1aboutnandusesdefault*Loadcapacitan