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Andrey Sviyazov andreysviyaz at gmail.comHi 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 >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120730/be97a0a4/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: UmTRXv2_300712.zi_ Type: application/octet-stream Size: 2091450 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120730/be97a0a4/attachment.obj>