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Andrey Sviyazov andreysviyaz at gmail.comHere project, sch and pcb files. Best regards, Andrey Sviyazov. 2012/7/30 Andrey Sviyazov <andreysviyaz at gmail.com> > 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 >>> >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120730/9299bed6/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... 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