 
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0vsysS-0000ZvC; Fri, 7 Feb 97 16:34 CST |
| Content-Type: |
text/plain; charset=us-ascii |
| CC: |
|
| Old-Return-Path: |
|
| Date: |
Fri, 07 Feb 1997 17:42:12 -0500 |
| Precedence: |
list |
| Reply-To: |
|
| Resent-Sender: |
|
| MIME-Version: |
1.0 |
| Status: |
O |
| From [log in to unmask] Mon Feb 10 16: |
29:05 1997 |
| TO: |
|
| X-Status: |
|
| Return-Path: |
<TechNet-request> |
| X-Loop: |
|
| X-Mailing-List: |
|
| Resent-From: |
|
| Content-Transfer-Encoding: |
7bit |
| Resent-Message-ID: |
<"ViadQ1.0.S2J._tw-o"@ipc> |
| Subject: |
|
| From: |
|
| References: |
|
| X-Mailer: |
Mozilla 3.01 (Win95; I) |
| Organization: |
Paragon Networks Int'l |
| Message-ID: |
|
| Parts/Attachments: |
|
|
Doug Brooks wrote:
>
> Various sources (e.g. IPC) have formulas for propagation
> delay for microstrip and stripline configurations. Does
> anyone know of a formula for propagation time in a
> DUAL stripline configuration? Or is the stripline
> configuration close enough?
Hi Doug,
I have calculated prop delay in a round about manner.
I'll reference you to a Motorola ECL Design Apps book
they published a while ago.
In it prop delay is given as pd = (L*C)^0.5
L = inductance of the trace/inch (or whatever)
C = capacitance of the trace/inch ( " )
I use *any* calculation I can get my hands on to
get the C. L is a function of the trace itself.
Typically about 20 nH/inch.
I then drop these values into pd = (L*C)^0.5
for a prop/inch number, then simply multiply
by the length of the trace for total delay.
If this all sounds like flying by the seat of
my pants, I agree. But, I would challange
anyone to give me a reasonably accurate
measure of trace inductance to 3 decimal places.
I could be well wrong, so I would appreciate any ideas.
Regards,
Doug
************************************************************
------------------------------------------------------------
The comments and opinions stated herein are mine alone,
and do not reflect those of my employer.
------------------------------------------------------------
************************************************************
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|
