DESIGNERCOUNCIL Archives

February 1999

DesignerCouncil@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Patrick Jabbaz <[log in to unmask]>
Reply To:
DesignerCouncil E-Mail Forum.
Date:
Thu, 18 Feb 1999 17:22:01 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (97 lines)
There are several mistakes (or  typos) in the formulas published in IPC 317A
you may find correct formulas in the calculators by Mr Brooks
http://www.ultracad.com/calc.htm
these calculators are provided by Douglas G. Brooks
and are windows based, and very easy to used

ATI Technologies Inc.,
Patrick Jabbaz
Sr. PCB Designer
33 Commerce Valley Drive East,
Thornhill, Ontario, Canada, L3T 7N6
Phone:(905) 882-2600 ext: 8254,   Fax: (905) 882-9339
Email: [log in to unmask]

> -----Original Message-----
> From: Cole, Jeff R [SMTP:[log in to unmask]]
> Sent: Thursday, February 18, 1999 4:59 PM
> To:   [log in to unmask]
> Subject:      Re: [DC] Embedded Microstrip
>
> Try this
>
> http://indy2.automata.com/tools/imped/imped-ems.unsafe.html
>
> Jeff Cole
> Battelle PNNL
> Scientific Engineering Associate
> (509) 375 - 2758 PH
> (509) 372 - 4725 Fax
> [log in to unmask]
>
>         -----Original Message-----
>         From:   Daniel A. Doherty [SMTP:[log in to unmask]]
>         Sent:   Thursday, February 18, 1999 11:27 AM
>         To:     [log in to unmask]
>         Subject:        [DC] Embedded Microstrip
>
>         Does anyone happen to know the CORRECT formula for the capacitance
> of an
>         embedded micstrip?  The one contained in -D-317A pg. 23 cannot be
> right
>         as the natural log of a negative number is not defined...
>
>         317A states:  C=(1/(H+t))*ln(1-(.6987*(E+1.41)/sqrtE))
>
>
>         Daniel A. Doherty
>         North Coast Design
>         6341 Applewood Ln.
>         Williamsburg, MI 49690-9725
>         V 616.267.9717
>         F 616.267.9718
>
>         ################################################################
>         DesignerCouncil E-Mail Forum provided as a free service by IPC
> using
> LISTSERV 1.8c
>         ################################################################
>         To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
>         To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
>         To unsubscribe:   SIGNOFF DesignerCouncil
>         ################################################################
>         Please visit IPC's web site (http://www.ipc.org) "On-Line
> Services"
> section for additional information.
>         For technical support contact Hugo Scaramuzza at [log in to unmask] or
> 847-509-9700 ext.312
>         ################################################################
>
> ################################################################
> DesignerCouncil E-Mail Forum provided as a free service by IPC using
> LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
> To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
> To unsubscribe:   SIGNOFF DesignerCouncil
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
> section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or
> 847-509-9700 ext.312
> ################################################################

################################################################
DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE DesignerCouncil <your full name>
To unsubscribe:   SIGNOFF DesignerCouncil 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################


ATOM RSS1 RSS2