UmTRXv2 final project

Jean-Samuel Najnudel - BJT PARTNERS SARL jsn at bjtpartners.com
Tue Jul 24 12:13:14 UTC 2012


Hi Andrey,

PCB copper is ready yet. We will lose 560 Euros and 3 weeks delay if we
change the copper. It is not impossible, we can decide to do that but I
would suggest we change the PCB for the next batch. After testing the v2
board, you may found more changes we need on the copper.

The board itself is not ready. We can change some passives. This will not
cost anything (or almost) and extra delay will be just one or two days at
most.

Please let me know what you want to do about the PCB.

Please let me know the exact passives modifications. I will purchase the
components asap and send the modifications list to the fab.

Best regards.

Jean-Samuel.
:-)
 Le 23 juil. 2012 22:47, "Andrey Sviyazov" <andreysviyaz at gmail.com> a
écrit :

> Hi Jean-Samuel.
>
> Please let me know fabrication progress, a specially PCB.
> I ask you because of few changes required to improve LMS phase noises.
> BOM required changes in passive components only.
> If PCB doesn't yet ordered, then possible I'll make changes too.
>
> Best regards,
> Andrey Sviyazov.
> (Sent from my mobile client)
> 04.07.2012 20:01 пользователь "Jean-Samuel Najnudel - BJT PARTNERS SARL" <
> jsn at bjtpartners.com> написал:
>
>> Hi Andrey,
>>
>> Thank you very much for your help.
>>
>> I will forward this to the fab.
>> Yes, you are all right, the FBMH2012HM121-T price is much better than the
>> MLB-201209-0120PU. However, availability on Farnell France is not as good
>> as the MLB-201209-0120PU. Price difference is quite big but we only use 5
>> beads per boards. Difference makes only about 1 euro per board. I will let
>> the fab decide between these 2 references.
>>
>> Best regards.
>>
>> Jean-Samuel.
>> :-)
>>
>>
>> On Wed, Jul 4, 2012 at 4:30 PM, Andrey Sviyazov <andreysviyaz at gmail.com>wrote:
>>
>>> Hi Jean-Samuel.
>>>
>>> Yes, you are all right and you can order TDK - MPZ1608S601A instead of
>>> MLB-160808-0600PL.
>>> And also possible to use 3 times cheaper FBMH2012HM121-T, 0805, 2.5A<http://ru.farnell.com/taiyo-yuden/fbmh2012hm121-t/ferrite-bead-0805-32mohm-2-5a/dp/8186421> instead
>>> of MLB-201209-0120PU.
>>>
>>> Best regards,
>>> Andrey Sviyazov.
>>>
>>>
>>>
>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com>
>>>
>>>> Hi Andrey,
>>>>
>>>> Thank you very much for your reply.
>>>> Now, I better understand.
>>>>
>>>> You are all right. I do not have anything as high current as
>>>> MLB-201209-0120PU at a lower price.
>>>>
>>>> However, I have a 0603 600 ohm 1A bead, as MLB-160808-0600PL, at a much
>>>> lower price.
>>>>
>>>> http://ru.farnell.com/tdk/mpz1608s601a/ferrite-bead-0603-600-ohm/dp/1669747RL
>>>> What do you think about this component (TDK MPZ1608S601A)?
>>>>
>>>> Best regards.
>>>>
>>>> Jean-Samuel.
>>>> :-)
>>>>
>>>>
>>>>
>>>> On Wed, Jul 4, 2012 at 3:22 PM, Andrey Sviyazov <andreysviyaz at gmail.com
>>>> > wrote:
>>>>
>>>>> Hi Jean-Samuel.
>>>>>
>>>>> If Farnell better for you, then please order exactly MLB-201209-0120PU<http://ru.farnell.com/mec-marcom/mlb-201209-0120pu/ferrite-bead-0805-case-120ohm-5a/dp/1308778RL>
>>>>> and  MLB-160808-0600PL<http://ru.farnell.com/mec-marcom/mlb-160808-0600pl/ferrite-bead-0603-case-600ohm-1a/dp/1308770RL>
>>>>> .
>>>>> They are HI_CURRENT beads and it is really required.
>>>>>
>>>>> Please find attached here new SCH and BOM files with new part numbers
>>>>> and links.
>>>>>
>>>>> Best regards,
>>>>> Andrey Sviyazov.
>>>>>
>>>>>
>>>>>
>>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com
>>>>> >
>>>>>
>>>>>> Hi Andrey,
>>>>>>
>>>>>> Thank you very much for your reply.
>>>>>>
>>>>>> Could you please confirm the components bellow are fine ?
>>>>>>
>>>>>> http://fr.farnell.com/murata/blm18tg601tn1d/ferrite-600ohm/dp/1115050RL
>>>>>>
>>>>>> http://fr.farnell.com/tdk/mmz2012121b/perle-de-ferrite-0805-120-ohm/dp/1669728RL
>>>>>>
>>>>>> Please let me know if this is fine.
>>>>>> If not, which would you suggest ?
>>>>>> http://ru.farnell.com/ferrite-beads
>>>>>>
>>>>>>
>>>>>> Thanks a lot for your help.
>>>>>>
>>>>>> Best regards.
>>>>>>
>>>>>> Jean-Samuel.
>>>>>> :-)
>>>>>>
>>>>>>
>>>>>> On Wed, Jul 4, 2012 at 2:02 PM, Andrey Sviyazov <
>>>>>> andreysviyaz at gmail.com> wrote:
>>>>>>
>>>>>>> Hi Jean-Samuel.
>>>>>>>
>>>>>>> For the TI160808U601 and TI201209U121 you can use any high current
>>>>>>> ferrite chip bead with 600 Ohm and 120 Ohm impedance respectively.
>>>>>>> For example you could order similar partnumbers from the ELFA<https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?init=1&shop=ELFA_EU-EN>catalogue in the
>>>>>>> 0603<https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-37&toc=20387>and
>>>>>>> 0805<https://www.elfa.se/elfa3%7Eeu_en/elfa/init.do?item=65-500-43&toc=0> SMD
>>>>>>> cases respectively, datasheet here pdf<https://www1.elfa.se/data1/wwwroot/assets/datasheets/jqMLB-HighCurrent_e.pdf>
>>>>>>> .
>>>>>>>
>>>>>>> Best regards,
>>>>>>> Andrey Sviyazov.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 2012/7/4 Jean-Samuel Najnudel - BJT PARTNERS SARL <
>>>>>>> jsn at bjtpartners.com>
>>>>>>>
>>>>>>>> Hi Andrey,
>>>>>>>>
>>>>>>>> Thank you very much for your reply.
>>>>>>>>
>>>>>>>> I try to find where to buy the TI160808U601 and TI201209-121
>>>>>>>> chokes. I do not know where I should find these. Would you know where I
>>>>>>>> should order these components ?
>>>>>>>>
>>>>>>>> By the way, do you confirm the ISSI SRAM is pin compatible with the
>>>>>>>> Cypress chip ?
>>>>>>>>
>>>>>>>> http://www.digikey.com/product-detail/en/IS61NLP51236-200TQLI/706-1103-ND/1557418
>>>>>>>>
>>>>>>>> Is this ISSI chip fine for our application ? Is 18 MBit enough ?
>>>>>>>> Do you confirm this ISSI chip is the best value for what we need ?
>>>>>>>> Are you sure we cannot find a lower cost chip with similar performances
>>>>>>>> and/or a better performances chip with similar cost ?
>>>>>>>> Are you sure we will not need to reroute the PCB ?
>>>>>>>>
>>>>>>>> We really need to be sure before starting the PCB production. If
>>>>>>>> both you and Alexander confirm everything is fine, I will ask the fab to
>>>>>>>> start the PCB.
>>>>>>>>
>>>>>>>> Please let me know.
>>>>>>>>
>>>>>>>> Again, thanks a lot for your help.
>>>>>>>>
>>>>>>>> Best regards.
>>>>>>>>
>>>>>>>> Jean-Samuel.
>>>>>>>> :-)
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Jul 3, 2012 at 11:40 PM, Andrey Sviyazov <
>>>>>>>> andreysviyaz at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Jean-Samuel.
>>>>>>>>>
>>>>>>>>> Please inform me what actually rf chockes partnumbers are problem
>>>>>>>>> to order.
>>>>>>>>> Unfortunately MuRata produce few billion pcs and then stopped for
>>>>>>>>> a few years.
>>>>>>>>> So, possible we have to find some Chinese fab partnumbers to order.
>>>>>>>>>
>>>>>>>>> Best regards,
>>>>>>>>> Andrey Sviyazov.
>>>>>>>>> (Sent from my mobile client)
>>>>>>>>> 04.07.2012 1:22 пользователь "Andrey Sviyazov" <
>>>>>>>>> andreysviyaz at gmail.com> написал:
>>>>>>>>>
>>>>>>>>>  Hi Jean-Samuel.
>>>>>>>>>> Unfortunately I have no internet connection now.
>>>>>>>>>> Tomorrow I'll check flash and others.
>>>>>>>>>>
>>>>>>>>>> Best regards,
>>>>>>>>>> Andrey Sviyazov.
>>>>>>>>>> (Sent from my mobile client)
>>>>>>>>>>
>>>>>>>>>> 04.07.2012 1:10 пользователь "Alexander Chemeris" <
>>>>>>>>>> alexander.chemeris at gmail.com> написал:
>>>>>>>>>> >
>>>>>>>>>> > On Mon, Jul 2, 2012 at 10:16 PM, Jean-Samuel Najnudel - BJT
>>>>>>>>>> PARTNERS
>>>>>>>>>> > SARL <jsn at bjtpartners.com> wrote:
>>>>>>>>>> > > 1/ Would you know a distributor for the Murata chokes ? The
>>>>>>>>>> fab them to have
>>>>>>>>>> > > some issue to source these.
>>>>>>>>>> >
>>>>>>>>>> > Andrey is looking into this.
>>>>>>>>>> >
>>>>>>>>>> > > 2/ Would you suggest a distributor for the GPS chip ?
>>>>>>>>>> >
>>>>>>>>>> > Try contacting manufacturer directly:
>>>>>>>>>> >
>>>>>>>>>> http://www.transystem.com.tw/product.php?b=g&m=pe&cid=4&sid=&id=66
>>>>>>>>>> >
>>>>>>>>>> > They have a distributor in UK, but I think it might be easier
>>>>>>>>>> to buy
>>>>>>>>>> > from the manufacturer directly:
>>>>>>>>>> > http://www.castlemicrowave.com/castle-contact.asp
>>>>>>>>>> >
>>>>>>>>>> > This chip is popular in Russia, so it is easy to source them
>>>>>>>>>> here,
>>>>>>>>>> > shipping them to EU might be a pain in big batches, but I think
>>>>>>>>>> we
>>>>>>>>>> > could send few chips for this prototyping batch if
>>>>>>>>>> manufacturer's lead
>>>>>>>>>> > time is too long. Here it costs $14.50/chip for more then 16
>>>>>>>>>> chips:
>>>>>>>>>> > http://www.compel.ru/infosheet/TSI/EB-570/
>>>>>>>>>> >
>>>>>>>>>> > --
>>>>>>>>>> > Regards,
>>>>>>>>>> > Alexander Chemeris.
>>>>>>>>>> > CEO, Fairwaves LLC / ООО УмРадио
>>>>>>>>>> > http://fairwaves.ru
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
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