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Simulators >> Circuit Simulators >> Need help on PTV mebedded single deck
https://designers-guide.org/forum/YaBB.pl?num=1179220224

Message started by kiran123 on May 15^th, 2007, 2:10am

Title: Need help on PTV mebedded single deck
Post by kiran123 on May 15^th, 2007, 2:10am

Hi Experts,

I am doing spectreMDL PTV based simulations i.e 3 PTV (fast,cold,normal) in same deck as listed below (File1.scs) ( i have just embedded deck and MDL code in same file for simplicity) but for slow and strong i observed there is difference of getting value if i use standalone SpectreMDL deck as shown by File2.scs.

Can anybody let me know is there any declaration error in the File1.scs

Best Regards
Kiran Kumar

/-----------------------------------------------------------------------------------------------------------------------------
/----------------------------------- File1.scs -------------------------------------------------------------------------
/-----------------------------------------------------------------------------------------------------------------------------
simulator lang=spectre
global 0

include "Models_tt.scs"

include "INV.scs"

parameters VA=1.2
parameters VH=3.3
parameters Temp=25
OP_TT options temp=Temp

vvdds (VDDS VSS) vsource type=dc dc=VH
vvss (VSS 0 ) vsource type=dc dc=0
va (IN 0 ) vsource type=dc dc=0

X1 ( OUT VDDS VSS IN ) INV

dc_sweep dc print=yes

save IN OUT VDDS VSS Isour:currents Vsour:currents

ff_for altergroup {
parameters Temp=-40
include "Models_ff.scs"
parameters VA =1.32
parameters VH =3.6
}
//dc_sweep_FF dc print=yes

ss_for altergroup {
parameters Temp=125
include "Models_ss.scs"
parameters VA =1.08
parameters VH =3.0
}

//dc_sweep_SS dc print=yes

////******************** ************************///////
////**************** MDL File *****************///////
////******************** **********************///////

alias measurement VOH {
export real Voh

run dc_sweep
Voh = max(V(OUT))
}

run dc_sweep
run VOH as VOH_TYP

run ss_for
run VOH as VOH_SLOW

run ff_for
run VOH as VOH_FAST
/************************************* END ***********************************/

/-----------------------------------------------------------------------------------------------------------------------------
/----------------------------------- File2.scs -------------------------------------------------------------------------
/-----------------------------------------------------------------------------------------------------------------------------

simulator lang=spectre
global 0

include "Models_ss.scs"

include "INV.scs"

parameters VA=1.08
parameters VH=3.0
parameters Temp=125
OP_TT options temp=Temp

vvdds (VDDS VSS) vsource type=dc dc=VH
vvss (VSS 0 ) vsource type=dc dc=0
va (IN 0 ) vsource type=dc dc=0

X1 ( OUT VDDS VSS IN ) INV

dc_sweep dc print=yes

save IN OUT VDDS VSS Isour:currents Vsour:currents

////******************** ************************///////
////**************** MDL File *****************///////
////******************** **********************///////

alias measurement VOH {
export real Voh

run dc_sweep
Voh = max(V(OUT))
}

run VOH

Title: Re: Need help on PTV mebedded single deck
Post by ywguo on Jun 4^th, 2007, 8:12pm

Hi, Kiran,

That is interesting. What is the difference?

Thanks
Yawei

Title: Re: Need help on PTV mebedded single deck
Post by kiran123 on Jun 5^th, 2007, 1:06am

ywguo wrote on Jun 4^th, 2007, 8:12pm:

Hi, Kiran,

That is interesting. What is the difference?

Thanks
Yawei

Hi Yawei,

It nice to see one response after a long time since i posted this , here i have pasted the data

using "File1.scs" ( 3 corner simulations in same deck )
Measurement Name : VOH_TYP
Voh = 2.93726

Measurement Name : VOH_SLOW
Voh = 2.54443

Measurement Name : VOH_FAST
Voh = 3.29538

using "File2.scs" the weak corner simulations results
Measurement Name : VOH
Voh = 2.40291

you can see the difference of values of Slow corner is significant , so i am just expecting what is the currect way of declaration of corner simulations (if want to define coner to corner PTV)

Thanks & Regards
Kiran