Thanks Arpad for this = explanation. Actually we have run for all the corners. The data has been gi= ven below. Please let us know if our assumptions are ok.

Do we need to take the= worst case number across process corners for C_comp_max. And similarly the= lowest 'estcap' value for C_comp_min.

Simulation= type :=3D Corner :- typ-typ ; Temp = :- 27 ; Vcc=3D1.8V

outdcbias &= nbsp; estcap &nb= sp; &nbs= p; &nb= sp; =

0.0000 &= nbsp; 2.706e-12 =

0.2000 = ; 2.752e-12 (max)

0.4000 = ; 2.706e-12 = ;

0.6000 &= nbsp; 2.673e-12 =

0.8000 &= nbsp; 2.626e-12 =

1.0000 &= nbsp; 2.436e-12 =

1.2000 &= nbsp; 1.934e-12 =

1.4000 = ; 1.809e-12 (min)

1.6000 = 1.825e-12 = ;

1.8000 &= nbsp; 1.851e-12 =

C_comp (typ) = =3D ( 2.76 + 1.809 ) / 2 pF =3D 2.2805 pF

Simulation= type :=3D Corner : slow-slow ; Temp= : 125 ; Vcc=3D1.7V

outdcbias estcap = &n= bsp; &nbs= p;

0.0000 = 2.8= 77e-12 &n= bsp;

0.2000 = ; 2.939e-12 (max) &nbs= p;

0.4000 &= nbsp; 2.8= 77e-12 &n= bsp;

0.6000 &= nbsp; 2.8= 14e-12 &n= bsp;

0.8000 &= nbsp; 2.6= 80e-12 &n= bsp;

1.0000 &= nbsp; 2.4= 82e-12 &n= bsp;

1.2000 &= nbsp; 1.9= 39e-12 &n= bsp;

1.4000 = 1.9= 23e-12

1.6000 &= nbsp; 1.9= 55e-12 &n= bsp;

1.7000 &= nbsp; 1.9= 79e-12 &n= bsp;

C_comp (max) = =3D 2.939 pF

Simulation= type :=3D Corner : fast-fast ; Temp= : -40 ; Vcc=3D1.9V

outdcbias = estcap = &nb= sp;

0.0000 &= nbsp; 2.532e-12 =

0.2000 = 2.569e-12 =

0.4000 = 2.532e-12 =

0.6000 = 2.511e-12 =

0.8000 = 2.510e-12 =

1.0000 = 2.415e-12 =

1.2000 = 2.073e-12 =

1.4000 = ; 1.714e-12 (min)

1.6000 = ; 1.724e-12 = ;

1.8000 = 1.740e-12 =

1.9000 &= nbsp; 1.751e-12 =

C_comp (min) = =3D 1.714 pF

Regards,

Amitava

From: owner-= ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Muranyi, Arpad
Sent: Wednesday, July 03, 2013 8:26 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] RE: Query on Ccomp parameter for IBIS model

Girija/Amitava,

Attachments are usually not allowed on these= email discussion

forums, because they would overload the serv= ers too much…

From within the voltage range of your signal= swing, pick the

smallest value of those capacitances for C_c= omp-min and the

highest value for C_comp-max and put the ave= rage of those

two in C_comp-typ.

I hope this helps,

Arpad

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

From: owner-= ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Girija V Chougala
Sent: Wednesday, July 03, 2013 5:39 AM
To: ibis-users@eda.org
Cc: Amitava Banerjee
Subject: [IBIS-Users] RE: Query on Ccomp parameter for IBIS model

Hi All,

As attachment is huge,= sending data again which I have simulated for bias voltage versus capacita= nce.

param_dcbias = C_comp &n= bsp; temperature

&nbs= p; &= nbsp;

&nbs= p;0. = ; 2.880e-= 12 85.00= 00

0.2= 000 = ; 2.937e-12 &nb= sp; 85.0000

0.4= 000 = ; 2.880e-12 &nb= sp; 85.0000

0.6= 000 = ; 2.837e-12 &nb= sp; 85.0000

0.8= 000 = ; 2.768e-12 &nb= sp; 85.0000

1.0= 000 = ; 2.600e-12 &nb= sp; 85.0000

1.2= 000 = ; 2.343e-12 &nb= sp; 85.0000

1.4= 000 = ; 1.902e-12 &nb= sp; 85.0000

1.6= 000 = ; 1.922e-12 &nb= sp; 85.0000

1.8= 000 = ; 1.960e-12 &nb= sp; 85.0000

Please let me know whi= ch value I should use in my IBIS model.

Regards,

Girija/Amitava<= /p>

From: Girija= V Chougala
Sent: Wednesday, June 26, 2013 2:15 PM
To: ibis-users@eda.org
Cc: Amitava Banerjee
Subject: Query on Ccomp parameter for IBIS model

Hi,

I have worked on deriving C_comp value for an I/O buffer (used the same technique given in= IBIS cookbook - http://www.vh= dl.org/ibis/cookbook/cookbook-v4.pdf ). The Vcc of the device is 1.8V.<= /p>

I have simulated C_comp for different bias voltages (VDC) - 0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.= 2, 1.4, 1.6, 1.8.

The different C_comp values obtained are given in the attached bmp file. Please let me kno= w which value should I use in my IBIS model.

Thanks & Regards,

Amitava

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