Designer’s Guide Community

legix

New Member

Offline

Posts: 1
Germany

HCI and BTI degration analyses in HSPICE using MOSRA
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

Back to top

IP Logged

Geoffrey_Coram Senior Fellow Offline Posts: 1998 Massachusetts, USA	Re: HCI and BTI degration analyses in HSPICE using MOSRA Reply #1 - 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.
Back to top	If at first you do succeed, STOP, raise your standards, and stop wasting your time. IP Logged

osman

New Member

Offline

Posts: 2

Re: HCI and BTI degration analyses in HSPICE using MOSRA
Reply #2 - 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

...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

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.

Back to top

IP Logged