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Michalka, Tim | 2 Dec 2010 22:51

SI position at Qualcomm Incorporated in San Diego, CA

The Power & Signal Integrity Group at Qualcomm in San Diego, CA has a position for a hardware engineer with
substantial experience in SI & PI. The requisition number is E1879856. Please direct all inquiries
through the Qualcomm Careers web site<https://jobs.qualcomm.com/public/jobSearch.xhtml>.
Regards,

Timothy Michalka
Principal Eng/Mgr

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Bryan Ackerly | 2 Dec 2010 23:27
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EMC book

Some time ago I remember a comment on "The ugly Yellow book" when 
referring to EMC texts.

I have recently got hold of a book "EMC for product designers - Meeting 
the European directive" by Tim Williams. It appears to be pretty good 
but it has a yellow cover. Not that the color of the cover is anything 
to go by but it did have me asking the question what "the Ugly Yellow 
book" on EMC actually was?

Any advice or observations or recommendations appreciated...

Thanks,
Bryan Ackerly.

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Ramesh N | 3 Dec 2010 07:40
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Re: Ferrite Bead for power decoupling systems

Hi Alvaro,
your questions are too generic to answer. there are numerous texts written
on these topics. May be you can start reading with Istvan
Novak<http://www.amazon.com/s/ref=ntt_athr_dp_sr_1?_encoding=UTF8&sort=relevancerank&search-alias=books&field-author=Istvan%20Novak>'s
web page : http://www.electrical-integrity.com/
There are few good application notes regarding PDN in Xilinx web page also.
Start reading!
Best of luck!!!
Regards,
Ramesh
On Fri, Nov 26, 2010 at 8:07 PM, Alvaro alkschbirs <
alvaro.alkschbirs@...> wrote:

> Hi gurus,
> Looking for Signal Integrity and EMI/EMC, What is the best design rule for
> power supply topology?
> Should I use ferrite beads in digital power supply pins (PHYs, digital
> clock
> oscillators, clock multipliers, microcontrollers)?
> Should I use different capacitor values for digital supply pins or it will
> increase the EMI (by anti-ressonant effects)?
>
> Thank you,
> Álvaro
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@... with 'unsubscribe' in the Subject field
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qantrix | 3 Dec 2010 11:43
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Re: DDR3 Vref and Vtt plane

How you would place decoup caps in double sided scenario?
2010/10/19 Jia Liu <liujia.scu@...>

> Hi Deepak,
> I think your plan is good.
> Maybe you can employ the double-side mount ddr chips for the 4 chips 800Mhz
> and 2 chips 667MHz to save PCB space.
>
> Br/Jia
>
> 2010/10/18 deepak Engineer <deepaksiengg@...>
>
> > Hello Experts,
> > In my design we have three processor with 3 DDR3 interface.
> > This DDR3 interface are working on 800MHz and 667Mhz.
> >
> > upto now, i was using a voltage divider for Vref and independant Vtt
> plane.
> >
> > but now I am planning to do some changes to get a robust results.
> >
> > 1. planning to use a regulator for Vref
> > 2. may be a common Vtt plane for all three memory interface.
> >
> > would you suggest on how can I reduce the PCB space and components ??
> > memory #device  speed
> > DDR3   4       800MHz
> > DDR3   2       667MH
> > DDR3   1       667MHZ
> >
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Lee Ritchey | 3 Dec 2010 17:10
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Re: EMC book

Brian,

That is not the "Ugly Yellow Book"  The ugly yellow book is more reddish 
brown.

--------------------------------------------------
From: "Bryan Ackerly" <backerly@...>
Sent: Thursday, December 02, 2010 2:27 PM
To: <si-list@...>
Subject: [SI-LIST] EMC book

> Some time ago I remember a comment on "The ugly Yellow book" when
> referring to EMC texts.
>
> I have recently got hold of a book "EMC for product designers - Meeting
> the European directive" by Tim Williams. It appears to be pretty good
> but it has a yellow cover. Not that the color of the cover is anything
> to go by but it did have me asking the question what "the Ugly Yellow
> book" on EMC actually was?
>
> Any advice or observations or recommendations appreciated...
>
> Thanks,
> Bryan Ackerly.
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@... with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
(Continue reading)

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Anand-forum | 3 Dec 2010 17:58
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(no subject)

Hi 
I am using USB type b v2 in full speed using  microcontroller pic18f4550  I will be designing double sided pcb I
have following query 

1 are there any layout guidelines for USB v2 full speed ? 
2 will the USB trace d+ d- needs to be impedance controlled ?
3 if yes then what should be the impedance for double sided pcb and how to calculate it. ?

I read about guidelines for high speed but not sure if that's same for full speed ?
Thanks for the help...

Best regard
Andy------------------------------------------------------------------
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Traa, Boris | 3 Dec 2010 18:06
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Re: EMC book

The most recent edition is green the first was more or less yellow

Kind regards
Boris Traa
System design engineer EMC

It's the currents that make circuits work or fail.

Philips Applied Technologies/EMC center
Room 2.020
High Tech Campus 26
5656AE Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail:  boris.traa@...

-----Original Message-----
From: si-list-bounce@...
[mailto:si-list-bounce@...] On Behalf Of Lee Ritchey
Sent: 2010 Dec 03 5:10 PM
To: Bryan Ackerly; si-list@...
Subject: [SI-LIST] Re: EMC book

Brian,

That is not the "Ugly Yellow Book"  The ugly yellow book is more reddish
brown.

--------------------------------------------------
From: "Bryan Ackerly" <backerly@...>
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Paul Levin | 3 Dec 2010 23:00
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Favicon

Re: EMC book

If "EMC for Product Designers - Meeting the European Directive"
is not 'the ugly yellow book,' would somebody please say what
the title of 'the ugly yellow book' is or was?

Thanks in advance.

Regards,

Paul Levin
consultant
________________

On 12/3/2010 9:06 AM, Traa, Boris wrote:
> The most recent edition is green the first was more or less yellow
>
> Kind regards
> Boris Traa
> System design engineer EMC
>
> It's the currents that make circuits work or fail.
>
> Philips Applied Technologies/EMC center
> Room 2.020
> High Tech Campus 26
> 5656AE Eindhoven, The Netherlands
> Tel: ++ 31 40 27 43766
> Fax: ++ 31 40 27 42224
> E-mail:  boris.traa@...
>
> -----Original Message-----
(Continue reading)

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Ramesh N | 4 Dec 2010 05:10
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Re: (no subject)

Hi,
1. There are numerous application notes on USB section layout guidelines...
Once i have used Cypress device.... I found their app notes and reference
designs very useful during development...
2. Yes.It should be impedance controlled... D+/- are differential signals
thus follow it accordingly.
3. We do impedance control - 50 E for single ended and 100 E differential
impedance for diff signals.There are good no of online impedance
calculators. check this one...
http://www.sunmantechnology.com/resources_ec.html
Normally what i do is that, i will do stack design using this one and
allegro calculator and give it to my fav fab house to fine tune it..
otherwise you ask for recommended stack-up from your fab house.. they should
be able to support you on this impedance requirement.
Good luck!!

Regards,
Ramesh N

On Fri, Dec 3, 2010 at 10:28 PM, Anand-forum <scholar1808@...> wrote:

> Hi
> I am using USB type b v2 in full speed using  microcontroller pic18f4550  I
> will be designing double sided pcb I have following query
>
> 1 are there any layout guidelines for USB v2 full speed ?
> 2 will the USB trace d+ d- needs to be impedance controlled ?
> 3 if yes then what should be the impedance for double sided pcb and how to
> calculate it. ?
>
(Continue reading)

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陶冶 | 4 Dec 2010 18:20
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Re: EMC book

this is a good book. it's very important to me.
2010/12/4 Paul Levin <levinpa@...>

> If "EMC for Product Designers - Meeting the European Directive"
> is not 'the ugly yellow book,' would somebody please say what
> the title of 'the ugly yellow book' is or was?
>
> Thanks in advance.
>
> Regards,
>
> Paul Levin
> consultant
> ________________
>
> On 12/3/2010 9:06 AM, Traa, Boris wrote:
> > The most recent edition is green the first was more or less yellow
> >
> > Kind regards
> > Boris Traa
> > System design engineer EMC
> >
> > It's the currents that make circuits work or fail.
> >
> > Philips Applied Technologies/EMC center
> > Room 2.020
> > High Tech Campus 26
> > 5656AE Eindhoven, The Netherlands
> > Tel: ++ 31 40 27 43766
> > Fax: ++ 31 40 27 42224
(Continue reading)

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