[SI-LIST] Re: MicroStrip capacitance

For different loading conditions (as a first pass) you could view 
the detailed section of our report as referenced in previous email. 
In this section you will find Impedance under various loading 
scenarios which will inform you whether or not there is different 
coupling between neighbor lines. This report gives you:

Zg (Zgrounded) -all other conductors are grounded
Z(effective) -all conductors are loaded signals
Zf (Zfloated) -all other conductors are floated (or stubbed)

As a second pass (if these values significantly differ) is to run 
the model in SPICE (you can control all loading scenarios), and from 
the SPICE results deduce the capacitive coupling directly.

Brian


--- In si-list@xxxxxxxxxxxxxxx, yoni tzafrir <imyonitz@xxxx> wrote:
> o.k.
> after using this web calculator, i got capacitance of 
1.557pf/inch, i also got Tpd 0.1382 ns/inch. my line length is 
1.7inch.  relaying on previous discussions from the Si-list, i 
assume that just multiplying the 1.7 in capacitance (1.557pf/inch) 
would be wrong, because it is based on the wrong assumption that all 
the line will be loaded at the same time.
> what should it be, then?
> Michel Perez <michel.perez@xxxx> wrote:
> Try this
> 
> http://www.emclab.umr.edu/pcbtlc/index.html
> 
> -----Original Message-----
> From: yoni tzafrir [mailto:imyonitz@xxxx]
> Sent: Tuesday, November 23, 2004 11:00 AM
> To: si-list@xxxx
> Subject: [SI-LIST] MicroStrip capacitance
> 
> 
> hi all,
> how do i caluculate the capacitance of a MicroStrip on a PCB?
> 
> 
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