[IBIS] RE: question about the [Composite Current] table

Ryohei,

No, your understanding is not correct. Since the
sum of the currents though each branch is zero,
the tool can calculate the bounce either way.

Thanks,

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

From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Ryohei Kato
Sent: Tuesday, August 28, 2012 7:49 PM
To: ibis@eda.org; ibis-users@eda.org
Subject: [IBIS] FW: question about the [Composite Current] table

Hi IBIS experts,

How about this question ?

Regards,
Ryohei Kato

From: owner-ibis@eda.org<mailto:owner-ibis@eda.org> [mailto:owner-ibis@eda.org]<mailto:[mailto:owner-ibis@eda.org]> On Behalf Of Ryohei Kato
Sent: Tuesday, August 28, 2012 12:05 PM
To: ibis@eda.org<mailto:ibis@eda.org>
Subject: [IBIS] question about the [Composite Current] table

Hi IBIS experts,

I have the basic question about the [Composite Current] table of IBIS5 model.

The ibis5.1 syntax explains the [Composite Current] as follows.

Keyword: [Composite Current]

Required: No
Description: Describes the shape of the rising and falling edge current waveforms from the power reference terminal of the buffer.

And the circuit image is attached file.

So I understood as follows.

The ibis5 model can consider the Bounce of V(vdd,vss) because of the current "vdd -> pch -> R_fix -> gnd".
But the ibis5 model CAN'T consider the Bounce of V(vdd,vss) because of the current "V_fix -> R_fix -> nch -> gnd".

Is my understanding correct ?

Regards,
Ryohei Kato

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