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Simulators >> Circuit Simulators >> HCI and BTI degration analyses in HSPICE using MOSRA
https://designers-guide.org/forum/YaBB.pl?num=1403100490

Message started by legix on Jun 18^th, 2014, 7:08am

Title: HCI and BTI degration analyses in HSPICE using MOSRA
Post by legix on Jun 18^th, 2014, 7:08am

Hi, i'm trying to do a reliability analysis using the MOSRA feature of HSPICE. The documentation about that topic is very limited. The only example is a BTI analysis of a ring oscillator (taken from the user manual):

Code:

* MOSRA TEST
vdd 1 0 2
mp1 3 2 1 1 p1 l=0.1u w=10u ad=5p pd=6u as=5p ps=6u
mn1 3 2 0 0 n1 l=0.1u w=5u ad=5p pd=6u as=5p ps=6u
mp2 4 3 1 1 p1 l=0.1u w=10u ad=5p pd=6u as=5p ps=6u
mn2 4 3 0 0 n1 l=0.1u w=5u ad=5p pd=6u as=5p ps=6u
mp3 2 4 1 1 p1 l=0.1u w=10u ad=5p pd=6u as=5p ps=6u
mn3 2 4 0 0 n1 l=0.1u w=5u ad=5p pd=6u as=5p ps=6u
c1 2 0 .1p
.model p1 pmos level=54 version=4.5
.model n1 nmos level=54 version=4.5
.model p1_ra mosra level=1
+tit0 = 5e-8 titfd = 7.5e-10 tittd = 1.45e-20
+tn = 0.25
.appendmodel p1_ra mosra p1 pmos
.mosra reltotaltime=1e8
.ic v(2)=2
.tran .1ps 5ns
.options post
.end

When I want to do an HCI simulation, i changed the mosra model to...:

Code:

.model n1_ra mosra level=1
+thci0 = 5e-8 tdce = 7.5e-10 tdii = 1.45e-20
+hn = 0.5
.appendmodel n1_ra mosra n1 nmos

...and added a print statement to measure the vth over time. The results don't show a change in vth between fresh and post stress simulation, even if a change the parameters (thci, tdce, tdii, hn) and the stress time signaficantly (time = aprox. 3000 years).

Does anyone know what I am doing wrong or are there tutorials for MOSRA? I didn't find anything in the net.

Thanks in advance!

P.S.: I'm using a 2013 version of HSPICE

Title: Re: HCI and BTI degration analyses in HSPICE using MOSRA
Post by Geoffrey_Coram on Jul 8^th, 2014, 8:02am

I haven't used MOSRA, but I have used a different aging simulation; in the one I use, I run one simulation to compute the degradation, but the devices don't change during the simulation -- the simulator computes their updated vth at the start of the second simulation.

Title: Re: HCI and BTI degration analyses in HSPICE using MOSRA
Post by osman on Sep 2^nd, 2014, 10:39am

legix wrote on Jun 18^th, 2014, 7:08am:

When I want to do an HCI simulation, i changed the mosra model to...:

Code:

.model n1_ra mosra level=1
+thci0 = 5e-8 tdce = 7.5e-10 tdii = 1.45e-20
+hn = 0.5
.appendmodel n1_ra mosra n1 nmos

I have the same problem, please let me know if you guys have fixed this. Probably there is something missing in HCI case, e.g. I have also tried by using simmode=1 which only used for post-stress analysis. I am also using HSPICE 2013 which shows following degraded parameters (unlike the values you have used above) but anyways I have also varied the values but no change in RADEG0 output file in DELVTH0 values.

.model p1_ra mosra level=1
+thci0=0 thci1=0 uhci0=0 uhci1=0 tdii=0 tdii=0 tdle=1 tdce=0 tea=0 tdlt=0 thcvd=0 tdvd=0 tdid=1

Kindly share if you find the solution.
Thank you.