[IBIS-Users] RE: Query on Ccomp parameter for IBIS model

Thanks Arpad for this explanation. Actually we have run for all the corners. The data has been given 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 := Corner :- typ-typ ;  Temp :- 27 ;  Vcc=1.8V

outdcbias          estcap

    0.0000             2.706e-12

    0.2000             2.752e-12     (max)

    0.4000             2.706e-12

    0.6000             2.673e-12

    0.8000             2.626e-12

    1.0000             2.436e-12

    1.2000             1.934e-12

    1.4000             1.809e-12     (min)

    1.6000             1.825e-12

    1.8000             1.851e-12



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



Simulation type := Corner : slow-slow ;  Temp : 125 ;  Vcc=1.7V

outdcbias  estcap

    0.0000                2.877e-12

    0.2000                2.939e-12 (max)

    0.4000                2.877e-12

    0.6000                2.814e-12

    0.8000                2.680e-12

    1.0000                2.482e-12

    1.2000                1.939e-12

    1.4000                1.923e-12

    1.6000                1.955e-12

    1.7000                1.979e-12



C_comp (max) = 2.939 pF



Simulation type := Corner : fast-fast ;  Temp : -40 ;  Vcc=1.9V

outdcbias         estcap

    0.0000            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            1.751e-12



C_comp (min) = 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 servers too much...

From within the voltage range of your signal swing, pick the
smallest value of those capacitances for C_comp-min and the
highest value for C_comp-max and put the average of those
two in C_comp-typ.

I hope this helps,

Arpad
===============================================================

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 capacitance.
param_dcbias    C_comp            temperature

    0.                        2.880e-12             85.0000
    0.2000               2.937e-12            85.0000
    0.4000               2.880e-12            85.0000
    0.6000               2.837e-12            85.0000
    0.8000               2.768e-12            85.0000
    1.0000               2.600e-12            85.0000
    1.2000               2.343e-12            85.0000
    1.4000               1.902e-12            85.0000
    1.6000               1.922e-12            85.0000
    1.8000               1.960e-12            85.0000
Please let me know which value I should use in my IBIS model.

Regards,
Girija/Amitava
From: Girija V Chougala
Sent: Wednesday, June 26, 2013 2:15 PM
To: ibis-users@eda.org<mailto: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.vhdl.org/ibis/cookbook/cookbook-v4.pdf ). The Vcc of the device is 1.8V.

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 know which value should I use in my IBIS model.

Thanks & Regards,
Amitava
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