王文松 | 15 Sep 01:42 2014
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Need a equation of inductance calculation for microstrip over the ground plane

Hello everyone,
Now I want to calculate a approximate value for inductance of microstrip
line over a ground plane.

Anyone have any references you can send my way? I know I've been able to
find this stuff in the past, but right now I'm coming up empty...

Thank you.

All the best,

Song

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王文松 | 14 Sep 23:59 2014
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How to add excitation for helix coil

Hello guys,

Now I buld up a hfss model for helix coil as the attached file, and plan to
get scattering parameters. But I donot know how to add excitation.

​

Thank you. Have a nice day.

Best regards,

Wen

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Wensong Wang (王文松 | 14 Sep 22:51 2014

How to add excitation for helix coil

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Z­©žµêìü­!Ú'¢Ù'£hÂÚu×±r+Z¶*'ý8ZžL¨»ñڽ槉ǝk/ÁzËkz«vÏÖ

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Wensong Wang (王文松 | 14 Sep 22:41 2014

How to add excitation for helix coil

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Z­©žµêìü­!Ú'¢Ù'£hÂÚu×±r+Z¶*'ý8ZžL¨»ñڽ槉ǝk/ÁzËkz«vÏÖ
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steve weir | 13 Sep 03:00 2014

Fwd: Re: Re: Ferrite Beads on Differential Signal Lines?


-------- Forwarded Message --------
Subject: 	Re: [SI-LIST] Re: Ferrite Beads on Differential Signal Lines?
Date: 	Fri, 12 Sep 2014 16:34:17 -0700
From: 	steve weir <weirsi@...>
To: 	Joel Brown <joel@...>

Joel, I am for doing what is needed. If the power rail is already quiet 
because it is very low Z then why add extra cost for no value?

If I need to insert loss without using a bunch of series impedance like 
a bead, then I bypass locally.  The capacitors that I really like for 
that are made by you know who and they excel at stripping off 
troublesome HF noise, without creating Z11 problems that beads do 
without load side bypassing.  If I have a need for more insertion loss 
than I can get with local bypass then I will manipulate etch first, and 
if that is not enough I will buy iron to supplant the bypass.  But the 
act of adding the iron often requires adding more bypass to take care of 
the Z11 inserted by the iron.

So:

Solve the problems that actually exist, and
Solve those problems by appropriate means.

If there isn't a problem to solve, it's time for a beer, not ferrite 
beads.  (Send them to little Gina.)
If there is a real problem to solve, and a ferrite bead is part of an 
appropriate solution then use it.

(Continue reading)

steve weir | 13 Sep 00:17 2014

Re: Ferrite Beads on Differential Signal Lines?

You might be surprised to learn how many times that mistake was made 
over the years especially in the 80's and 90's.  Lee saw it and had to 
fix it many times, usually by just removing the inappropriately applied 
beads.

Steve.
On 9/12/2014 3:13 PM, Lucci, Christopher wrote:
> Thanks!  Completely understood and agreed.   I wasn't thinking that anyone would omit decoupling caps and
hence the confusion.
>
> Thanks Again,
> C. S. Lucci
>
> -----Original Message-----
> From: steve weir [mailto:weirsi@...]
> Sent: Friday, September 12, 2014 6:10 PM
> To: Lucci, Christopher; si-list@...
> Subject: Re: [SI-LIST] Re: Ferrite Beads on Differential Signal Lines?
>
> In the first case the decoupling capacitors satisfy the load where the bead can't, whereas in the second
case they are absent and the load starves at medium to high frequency.
>
> Steve.
>
> On 9/12/2014 3:02 PM, Lucci, Christopher wrote:
>> Mr. Weir -
>>
>> Can you further explain what you mean by not using a ferrite in a power feed of a broadband amplifier (e.g.
digital IC)?  How is this different from #1 in the first list "As  part of a properly decoupled high insertion
loss filters."
(Continue reading)

steve weir | 13 Sep 00:09 2014

Re: Ferrite Beads on Differential Signal Lines?

In the first case the decoupling capacitors satisfy the load where the 
bead can't, whereas in the second case they are absent and the load 
starves at medium to high frequency.

Steve.

On 9/12/2014 3:02 PM, Lucci, Christopher wrote:
> Mr. Weir -
>
> Can you further explain what you mean by not using a ferrite in a power feed of a broadband amplifier (e.g.
digital IC)?  How is this different from #1 in the first list "As  part of a properly decoupled high insertion
loss filters."
>
> Not sure I caught what you meant?
>
> Respectfully,
> C. S. Lucci
>
> -----Original Message-----
> From: si-list-bounce@...
[mailto:si-list-bounce@...] On Behalf Of steve weir
> Sent: Friday, September 12, 2014 5:30 PM
> To: si-list@...
> Subject: [SI-LIST] Re: Ferrite Beads on Differential Signal Lines?
>
> While often abused, ferrite beads are a tool that have legitimate purposes.  What makes no sense is to either:
>
> 1) "Solve" a problem that doesn't exist, or
> 2) Solve a problem with inappropriate means.
>
(Continue reading)

Craig Francis | 12 Sep 01:11 2014
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Ferrite Beads on Differential Signal Lines?

SI-List,
I haven't seen any literature concerning using ferrite beads on each signal
line of a differential pair.
Usually only a common-mode choke is used to reduce common-mode EMI.

Can ferrite beads be used on a differential pair to increase the the rise
time of the signal and reduce unnecessary high-frequency content that may
radiate?

The two ferrite beads would be sized to allow the bandwidth necessary for
the differential signal's highest data rate.

Thanks,
Craig Francis

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Craig Francis | 12 Sep 01:13 2014
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Ferrite Beads on Differential Signal Lines?

SI-List,
I haven't seen any literature concerning using ferrite beads on each signal
line of a differential pair.
Usually only a common-mode choke is used to reduce common-mode EMI.

Can ferrite beads be used on a differential pair to increase the the rise
time of the signal and reduce unnecessary high-frequency content that may
radiate?

The two ferrite beads would be sized to allow the bandwidth necessary for
the differential signal's highest data rate.

Thanks,
Craig Francis

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David Vye | 10 Sep 22:49 2014

EM simulation for Waterloo, Ontario RF and SI engineers

there will be a free electronics simulation workshop at the ANSYS training
center in Waterloo Ontario next week. Two EM experts in RF antenna and PCB
signal integrity analysis will conduct the half day event. Go to the
following link for more details and to register. Looks like it will be a
good event for engineers in the area to attend.
http://www.ansys.com/About+ANSYS/Events/ANSYS+Electronics+Simulation+Workshop-waterloo-9-17-14

David

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heidi_barnes | 10 Sep 16:59 2014

free Keysight Technologies (formerly Agilent) Signal Integrity EDA Seminar in Santa Clara on 9/16 and 9/18

Not too late to register for a free Keysight Technologies seminar on some of the latest simulation
techniques for DDR.  Topics include traditional time domain DDR4 compliance test bench simulations and
new statistical channel simulator methods for low BER contour eye diagram analysis.  Also included in the
seminar is a discussion of EM simulation techniques for high speed digital EMI/EMC analysis.
The free seminar is next week in Santa Clara on the 16th and then repeated again on the 18th.

Details and registration can be found at:

http://www.keysight.com/main/eventDetail.jspx?cc=US&lc=eng&ckey$60654&nid=-35198.0.08&id$60654

Please be sure to register since space is limited.

See you there!
--Heidi

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Gmane