RE: [IBIS-Users] C_comp

From: Muranyi, Arpad <arpad.muranyi_at_.....>
Date: Mon Jul 11 2005 - 08:56:13 PDT
Radovan,
 
IBIS simulators have a special algorithm which doesn't
allow the C_comp to load the Vt curves or ramp in the
model, but allows it to be visible for signals which
arrive at the model.  IN other words it is not visible
from the inside out, but it is visible from the outside
in.
 
Correct, when there is not Vt data in a model, Ramps
are used.
 
Arpad
======================================================

________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Radovan.Vuletic@infineon.com
Sent: Monday, July 11, 2005 8:28 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] C_comp



Hi IBIS experts (once again), 

Now about C_comp: in IBIS specification is written that the C_comp defines the silicon die capacitance and that influences [Ramp] parameters. Question would be how (is it used as capacitive load)?

Is the [Ramp] the only parameter that is influenced by C_comp influences, or there are some other things too? 

I mean, when I generate [Rising Waveform] and [Falling Waveform] intrinsic capacitances of  drivers and receivers, ESD structures and wiring are already accounted (in netlist), so I assume that taking into the account C_comp too would be kind of double counting. 

Later, when simulation tool is using IBIS model, if there are [Rising Waveform] and [Falling Waveform] this waveforms will be taken, so the information about driver/receiver, ESD and wiring capacitances will be "extracted" out of this curves, C_comp is not used - true or not?

If there are no [Rising Waveform] or [Falling Waveform] the [Ramp] parameter will be taken (true or not?). In this case simulation tool is using only [Ramp] data (this data intrinsically contain C_comp), so the C_comp is not used (true or not?)

Once again, many thanks for any help! 
Regards, 
Radovan 

Best regards / Mit freundlichen Grüßen / S po¹tovanjem 
Radovan Vuletiæ 

Infineon Technologies AG 
MP PD PDE 
Room 03.911 
Balanstraße 73 
D-81541 München 

Phone:          +49 (0)89 234 20108 
Fax:            +49 (0)89 234 27705 
Fax (PC):       +49 (0)89 234 955 5305 

E-mail: radovan.vuletic@infineon.com 


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Received on Mon Jul 11 08:56:18 2005

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