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Alexander Chemeris alexander.chemeris at gmail.comAndrey, thanks. Please send me UmTRXv2_sch_all.pdf as well On Mon, Jul 30, 2012 at 4:22 PM, Andrey Sviyazov <andreysviyaz at gmail.com> wrote: > Here 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 >>> >>> >> > -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru