UmTRXv2 final project

Andrey Sviyazov andreysviyaz at gmail.com
Mon Jul 30 12:20:06 UTC 2012


Hi Jean-Samuel.

Here are attached last versions of interactive PDF for assembly and schema,
and BOM (rename zi_ to zip first).
List of components which are changed:
L6-1, L6-2 = R0603 0 Ohm instead of choke
C45-1, C45-2 = Do Not Install
C82-1, C82-2, C98-1, C98-2 = 100pF instead of 470pF
C83-1, C83-2, C99-1, C99-2 = 1500pF instead of 8.2nF
C84-1, C84-2, C97-1, C97-2 = 33pF instead of 150pF
R106-1, R106-2, R121-1, R121-2 = 2k2 instead of 820 Ohm
R109-1, R109-2, R119-1, R119-2 = 3k3 instead of 1.2 kOhm

Best regards,
Andrey Sviyazov.



2012/7/25 Andrey Sviyazov <andreysviyaz at gmail.com>

> Hi Jean-Samuel.
>
> First of all you're right, we can't delay production.
> So, I am sure it is better if PCB production will continue as you suggest.
>
> There are only three hardware issues which have to be solved before
> assembling:
> 1) Improving LMS phase noise.
> It is almost done and Alexander wrote you which component need to order.
>
> 2) Digital noise which born in GPS module 230.
> In ver.2 we will use GPS module 570, but I am afraid that we can get the
> same problems.
> So, I need 1-2 days to workaround this issue.
> And also we have to understand either it important or it doesn't because
> this noises  hided under modulation.
>
> 3) LMS engineers suggested us to use PLL loop filter 100kHz instead 50kHz.
> In case of 100kHz we have to decrease charge-pump current from 1.2-1.9mA
> down to 0.4mA, but I am afraid about integral phase noise of LO because
> (possible)  it can affect modulation phase error (in degrees).
> I think, required 1-2 days (the same days) to understand this also.
>
> So, at Thirsday I will send you final BOM and assembly files.
> Hope it doesn't delay production, otherwise tell me and we'll hurry up.
>
> Best regards,
> Andrey Sviyazov.
>
>
>
> 2012/7/24 Alexander Chemeris <alexander.chemeris at gmail.com>
>
>> Hi Jean-Samuel,
>>
>> We're sitting together with Andrey Sviyazov now and he says that it's
>> fine to continue with this PCB.
>>
>> You will need 40pcs of this 0 Ohm jumpers (2pcs per board):
>>
>> http://fr.farnell.com/bourns/cr0603-j-000elf/resistor-0603-0r-5-0-1w/dp/2008343
>>
>> Andrey will update the schematics and BoM later today.
>>
>> On Tue, Jul 24, 2012 at 2:13 PM, Jean-Samuel Najnudel - BJT PARTNERS
>> SARL <jsn at bjtpartners.com> wrote:
>> > 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
>> >>>> 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
>> >>>>>> and  MLB-160808-0600PL.
>> >>>>>> 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
>> >>>>>>>> catalogue in the 0603 and 0805 SMD cases respectively, datasheet
>> here 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
>> >>>>>>>>>
>> >>>>>>>>>
>> >>>>>>>>
>> >>>>>>>
>> >>>>>>
>> >>>>>
>> >>>>
>> >>>
>> >
>>
>>
>>
>> --
>> Regards,
>> Alexander Chemeris.
>> CEO, Fairwaves LLC / ООО УмРадио
>> http://fairwaves.ru
>>
>
>
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