From: owner-ibis-users@eda.org (ibis-users) To: ibis-users-digest@eda.org Subject: ibis-users V1 #254 Reply-To: Sender: owner-ibis-users@eda.org Errors-To: owner-ibis-users@eda.org Precedence: bulk ibis-users Thursday, December 4 2014 Volume 01 : Number 254 ---------------------------------------------------------------------- Date: Thu, 4 Dec 2014 16:12:36 -0800 From: "Tom Dagostino" Subject: RE: [IBIS-Users] Modeling of Capacitance in Differential Receiver This is a multipart message in MIME format. - ------=_NextPart_000_0053_01D00FDD.1ED7E9C0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0054_01D00FDD.1ED810D0" - ------=_NextPart_001_0054_01D00FDD.1ED810D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Manish I can think of a couple of ways of solving this. 1. Either generate a dummy pin or use an existing NC pin. Use a Series R model, 50 Ohms from the DP and DN to the dummy pin. Make the dummy pin a Terminator and put the Cmid in the terminator. 2. Make an equivalent Pi circuit of the Y circuit you have. 3. Have you thought of an External Model for this? Good luck Tom Dagostino Teraspeed Labs 9999 SW Wilshire Street Suite 102 Portland, OR 97225 tom@teraspeedlabs.com www.teraspeedlabs.com 971-279-5325 office 503-430-1065 cell From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Manish BANSAL Sent: Thursday, December 04, 2014 5:13 AM To: ibis-users@eda.org Subject: [IBIS-Users] Modeling of Capacitance in Differential Receiver Hello All, I have a differential receiver as following where there is capacitance (Cmid shown in Fig.) connected to the middle of the termination resistance with ground. CmidIs there any method to model this capacitance in IBIS ? Thanks & Regards, Manish - -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. - -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. - ------=_NextPart_001_0054_01D00FDD.1ED810D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Manish

= I can think of a couple of ways of solving th= is.

1. Either generate a dummy pin or use an= existing NC pin. Use a Series R model, 50 Ohms from the DP and DN to= the dummy pin. Make the dummy pin a Terminator and put the Cmid in t= he terminator.

2. <= /span>Make an equivalent Pi circuit= of the Y circuit you have.

3. Have you thought = of an External Model for this?

Good luck

Tom Dagostino

Teraspeed La= bs

= 9999 SW Wilshire Street

Suite 102

Portland, OR 97225

tom@teraspeedlabs.com <= o:p>

www.teras= peedlabs.com

971-279-5325 office

503-430-1065 cell

=

From: owner-ibis-users@e= da.org [mailto:owner-ibis-users@eda.org] On Behalf Of Manish BANSAL<= br>Sent: Thursday, December 04, 2014 5:13 AM
To: ibis-user= s@eda.org
Subject: [IBIS-Users] Modeling of Capacitance in Differ= ential Receiver

=

Hello All,

<= p class=3DMsoNormal>

<= span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";color:#0020= 52'>I have a differential receiver as following where there is capaci= tance (Cmid shown in Fig.) connected to the middle of the termination resis= tance with ground.

&nbs= p;

3DCmid Is there any m= ethod to model this capacitance in IBIS ?

&= nbsp;

=

<= /o:p>

=

Thanks & Regards,

Manish

--
This message has been scanned for viruses and
dangerous content= by MailScanner, and is=
believed to be clean.

--=20
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w= ant to model it in ibis? Simple discrete components would be way easier t= o implement and probably simulate faster.=20=20 Aubrey=20 Sent from my iPhone > On Dec 4, 2014, at 7:12 AM, Manish BANSAL wrot= e: >=20 > Hello All, >=20=20 > I have a differential receiver as following where there is capacitance (= Cmid shown in Fig.) connected to the middle of the termination resistance w= ith ground. >=20=20 > Is there any method to model this capacitance= in IBIS ? >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 >=20=20 > Thanks & Regards, > Manish >=20 > --=20 > This message has been scanned for viruses and=20 > dangerous content by MailScanner, and is=20 > believed to be clean. > - --=20 This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. - --Apple-Mail-E8B384C3-FF08-49D1-8748-497612311881 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable

Mannish,

= Since the circuit you've drawn is external to the receiver, why would you w= ant to model it in ibis? Simple discrete components would be way eas= ier to implement and probably simulate faster.

<= div>Aubrey

Sent from my iPhone

On Dec 4, 2014, a= t 7:12 AM, Manish BANSAL <ma= nish-ftm.bansal@st.com> wrote:

Hello All,

I have a differential receiver as = following where there is capacitance (Cmid shown in Fig.) connected t= o the middle of the termination resistance with ground.
<= /p>
<image002.png><image004.png>Is there any method to model this capacitance in IBIS ?

<= /o:p>
=
= ;
&nbs= p;
&nb= sp;
&n= bsp;
&= nbsp;
=

<= o:p>
=

Manish

--=20
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.

<Differential_Rx.png&g= t;

--=20
This message has been scanned for viruses and
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believed to be clean. - --Apple-Mail-E8B384C3-FF08-49D1-8748-497612311881-- - -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail mikelabonte@eda-stds.org |or ibis-request@eda-stds.org | |IBIS reflector archives exist under: | | http://www.eda-stds.org/ibis/email_archive/ Recent | http://www.eda-stds.org/ibis/users_archive/ Recent | http://www.eda-stds.org/ibis/email/ E-mail since 1993 ------------------------------ End of ibis-users V1 #254 *************************