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Alexander Chemeris alexander.chemeris at gmail.comHi 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