[gta02-core] gta02-core Digest, Vol 4, Issue 19

Ron K. Jeffries rjeffries at gmail.com
Thu Sep 17 23:46:22 CEST 2009


PCB Fabrication Sources
~~~~~~~~~~~~~~~~~~~~
John Baggs,  long time colleague and  trusted engineer friend
has his own VDSL2 design (8 layer PCB, 21/2 x 3 inc board , ~very~ dense).

Baggs says:

"We used ION Design for PCB design, and the manager Hoa Huynh hoa at iondsn.com
is the only way to go.  He was the manager at Palpilot, now has his
own branch service shop.
He can get you PCBs built in China cheaper than here [USA], faster,
and higher quality
(don't ask me how, but some companies have found that the bench mark
for PCB fab is in China,
some of these people are on the AVL for Cisco and other large companies).
And if you want turn key assembly, he can set you up for that."

Hoa Sum Huynh
President
ION Design
Cell - (714)823-5682
Office - (714)855-2688 x101
Fax - (408)689-9625

I am cc'ing Mr Hunh as well as Mr Baggs.

Werner, if you would like me to work some of the details,
I'll gladly do so. I am in same time zone as Hoa Sum Hunh

---
Ron K. Jeffries
rjeffries at gmail.com
805-343-1106


---
Ron K. Jeffries
http://blog.eronj.com









On Thu, Sep 17, 2009 at 03:00,  <gta02-core-request at lists.openmoko.org> wrote:
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> Today's Topics:
>
>   1. Re: Modem schematic / RF help needed (Werner Almesberger)
>   2. Re: Modem schematic / RF help needed (Werner Almesberger)
>   3. Re: Modem schematic / RF help needed (Dave Ball)
>   4. Re: Modem schematic / RF help needed (Dave Ball)
>   5. Re: Modem schematic / RF help needed (Werner Almesberger)
>   6. Good news from Sao Paulo (Werner Almesberger)
>   7. Re: Good news from Sao Paulo (Evgeniy Ginzburg)
>   8. Re: Good news from Sao Paulo (?lvaro Lopes)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 16 Sep 2009 10:35:47 -0300
> From: Werner Almesberger <werner at openmoko.org>
> Subject: Re: [gta02-core] Modem schematic / RF help needed
> To: Dave Ball <openmoko at underhand.org>
> Cc: gta02-core at lists.openmoko.org
> Message-ID: <20090916133547.GA5415 at u1010>
> Content-Type: text/plain; charset=us-ascii
>
> Dave Ball wrote:
>> From a brief look, the si1040x wouldn't supply enough current - the modem
>> can draw peaks of 2A, but the SI1040X can only drive loads up to 0.43A
>> (less at 3.7v).
>
> Oh, I meant the symbol, not the part. I'm not worried about
> sourcing - there's a whole family of these switches with very
> similar characteristics, and Rask even found a second source
> that's a direct replacement. Who could ask for more ? :-)
>
> - Werner
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 16 Sep 2009 10:40:01 -0300
> From: Werner Almesberger <werner at openmoko.org>
> Subject: Re: [gta02-core] Modem schematic / RF help needed
> To: Rask Ingemann Lambertsen <ccc94453 at vip.cybercity.dk>
> Cc: gta02-core at lists.openmoko.org
> Message-ID: <20090916134001.GB5415 at u1010>
> Content-Type: text/plain; charset=us-ascii
>
> Rask Ingemann Lambertsen wrote:
>>    Can we rename the switched supply from VBAT to something like VBAT_GSM or
>> perhaps GSM_VBAT for consistency with the GSM_2V8 net? When looking at just
>> modem.sch, I think it too easily causes confusion to call it just VBAT. If
>> we include GSM in the name, it looks less like a connection straight to the
>> battery.
>
> Yes, that's horribly confusing. It's a legacy from GTA01, where
> this connection did indeed exist. Either new name sounds good to
> me.
>
> - Werner
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 16 Sep 2009 15:02:31 +0100
> From: Dave Ball <openmoko at underhand.org>
> Subject: Re: [gta02-core] Modem schematic / RF help needed
> To: Werner Almesberger <werner at openmoko.org>
> Cc: gta02-core at lists.openmoko.org
> Message-ID: <4AB0EFF7.3090203 at underhand.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Werner Almesberger wrote:
>> Dave Ball wrote:
>>
>>> From a brief look, the si1040x wouldn't supply enough current - the modem
>>> can draw peaks of 2A, but the SI1040X can only drive loads up to 0.43A
>>> (less at 3.7v).
>>>
>>
>> Oh, I meant the symbol, not the part. I'm not worried about
>> sourcing - there's a whole family of these switches with very
>> similar characteristics, and Rask even found a second source
>> that's a direct replacement. Who could ask for more ? :-)
>>
>
>
> Ahh - great.  I have updated the symbol, so it's now as pretty as the
> SI1040X, and corrected the pin names too.
>
> I hope S?o Paulo's treating you well!
>
>
> Dave
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 16 Sep 2009 15:11:44 +0100
> From: Dave Ball <openmoko at underhand.org>
> Subject: Re: [gta02-core] Modem schematic / RF help needed
> To: Werner Almesberger <werner at openmoko.org>
> Cc: gta02-core at lists.openmoko.org
> Message-ID: <4AB0F220.9040203 at underhand.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Werner Almesberger wrote:
>> Rask Ingemann Lambertsen wrote:
>>
>>>    Can we rename the switched supply from VBAT to something like VBAT_GSM or
>>> perhaps GSM_VBAT for consistency with the GSM_2V8 net? When looking at just
>>> modem.sch, I think it too easily causes confusion to call it just VBAT. If
>>> we include GSM in the name, it looks less like a connection straight to the
>>> battery.
>>>
>>
>> Yes, that's horribly confusing. It's a legacy from GTA01, where
>> this connection did indeed exist. Either new name sounds good to
>> me.
>>
>
> Yup, VBAT is confusing, and isn't used for anything other than the GSM,
> so i've used VBAT_GSM instead.
>
> All the best,
> Dave
>
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 16 Sep 2009 14:39:20 -0300
> From: Werner Almesberger <werner at openmoko.org>
> Subject: Re: [gta02-core] Modem schematic / RF help needed
> To: Dave Ball <openmoko at underhand.org>
> Cc: gta02-core at lists.openmoko.org
> Message-ID: <20090916173920.GC5415 at u1010>
> Content-Type: text/plain; charset=us-ascii
>
> Dave Ball wrote:
>> I hope S?o Paulo's treating you well!
>
> Very. I'll take pictures of the facilities in a bit.
>
> - Werner
>
>
>
> ------------------------------
>
> Message: 6
> Date: Thu, 17 Sep 2009 00:20:21 -0700
> From: Werner Almesberger <werner at openmoko.org>
> Subject: [gta02-core] Good news from Sao Paulo
> To: gta02-core at lists.openmoko.org
> Message-ID: <20090917072020.GA17981 at almesberger.net>
> Content-Type: text/plain; charset=us-ascii
>
> Good news ! Prof. Marcelo Knoerich Zuffo of the University of Sao
> Paulo (USP) has offered gta02-core the use of his SMT facility. As if
> this wasn't generous enough, all he asks for in return are a few of
> our prototypes for his team to play with.
>
> Here's a picture I took:
> http://people.openmoko.org/werner/smt.jpg
>
> Just kidding :-) This is just a manual rework station. Here's the real
> thing:
> http://people.openmoko.org/werner/smt-line-usp.jpg
>
> There are three pick-and-place units with a total of about 200 feeders.
> The long white thing at the end is a 12 zone lead-free nitrogen oven.
>
> I'll upload some more pictures later today, when I'm back home.
>
> Regarding PCBs, there are no PCB houses that are good at making this
> kind of board in small quantities in Brazil, so the production team at
> USP recommended that we look for a PCB maker elsewhere. If anyone has
> a recommendation, please post it.
>
> As a reminder, our PCB design parameters are 6 layers, 1 mm board
> thickness, 5 mil track width and clearance, and ENIG coating. (USP had
> some nasty experiences with cheaper coatings, and we wouldn't want to
> lose half our boards to SMT problems.) 1 mm for six layers is a thin
> board, which may drive the price up. 5 mil is also more demanding than
> the 6 mil many mainstream PCB houses offer.
>
> I also asked about whether we could use micro-vias under pads and
> the production team promised me a response in a few days. Oh, and I
> forgot to ask for a recommendation for a place that makes stencils.
> I'll do so by mail.
>
> We also owe a lot of gratitude to Jon "Maddog" Hall who brought me
> in touch with Prof. Zuffo and who convinced him to support our
> project.
>
> - Werner
>
>
>
> ------------------------------
>
> Message: 7
> Date: Thu, 17 Sep 2009 12:22:58 +0400
> From: Evgeniy Ginzburg <nad.oby at gmail.com>
> Subject: Re: [gta02-core] Good news from Sao Paulo
> To: Werner Almesberger <werner at openmoko.org>
> Cc: gta02-core at lists.openmoko.org
> Message-ID:
>        <46f27d5a0909170122h18a4132vf228aa2bf40b0c8b at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> On Thu, Sep 17, 2009 at 11:20 AM, Werner Almesberger
> <werner at openmoko.org> wrote:
>> Good news ! Prof. Marcelo Knoerich Zuffo of the University of Sao
>> Paulo (USP) has offered gta02-core the use of his SMT facility. As if
>> this wasn't generous enough, all he asks for in return are a few of
>> our prototypes for his team to play with.
> Fantastic news!
> Werner you and all the guys in gta02-core are doing very fascinating job.
> And of course special thanks to Prof. Marcelo Knoerich Zuffo for
> generous offer and Jon "Maddog" Hall for all he do.
> [snip loooong quote]
>
> --
> So long, and thanks for all the fish.
>
>
>
> ------------------------------
>
> Message: 8
> Date: Thu, 17 Sep 2009 09:27:46 +0100
> From: ?lvaro Lopes <alvieboy at alvie.com>
> Subject: Re: [gta02-core] Good news from Sao Paulo
> To: Werner Almesberger <werner at openmoko.org>
> Cc: gta02-core at lists.openmoko.org
> Message-ID: <4AB1F302.1000708 at alvie.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Werner Almesberger wrote:
>> Good news ! Prof. Marcelo Knoerich Zuffo of the University of Sao
>> Paulo (USP) has offered gta02-core the use of his SMT facility. As if
>> this wasn't generous enough, all he asks for in return are a few of
>> our prototypes for his team to play with.
>
> Indeed good news! Good work Werner.
>
>> Regarding PCBs, there are no PCB houses that are good at making this
>> kind of board in small quantities in Brazil, so the production team at
>> USP recommended that we look for a PCB maker elsewhere. If anyone has
>> a recommendation, please post it.
>
> We have that one here in pt, not sure if Ruben requested a quote already.
>
>> We also owe a lot of gratitude to Jon "Maddog" Hall who brought me
>> in touch with Prof. Zuffo and who convinced him to support our
>> project.
>
> Kudos to Jon and Prof. Zuffo :)
>
> ?lvaro
>
>
>
> ------------------------------
>
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> End of gta02-core Digest, Vol 4, Issue 19
> *****************************************
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