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[董家宁 <jndong AT sdu.edu.cn>]

Hi Gerard,
  Thanks for the careful checking.
  The schematic for the outer hybrid and inner hybrid are updated and upload 
to the WIKI. (https://wiki.bnl.gov/star/index.php/Hybrid_and_T-board)
  For the layout, please let me know if you see any inconsistency.

Best,
Jianing


> -----原始邮件-----
> 发件人: "Zhenyu Ye" <yezhenyu2003 AT gmail.com>
> 发送时间: 2019-11-10 14:45:08 (星期日)
> 收件人: "Gerard Visser" <gvisser AT indiana.edu>
> 抄送: "董家宁" <jndong AT sdu.edu.cn>, star-fst-l AT lists.bnl.gov
> 主题: Re: [Star-fst-l] Weekly FST meeting - 10/31/2019
> 
> Gerard, thanks for looking into this.
> 
> > On Nov 7, 2019, at 11:48 PM, Gerard Visser <gvisser AT indiana.edu> wrote:
> > 
> > hi Jianing,
> >     I checked the schematics
> > 
> > outer hybrid
> > https://drupal.star.bnl.gov/STAR/system/files/hybrid_outer_v2_3-schematic_0.pdf
> > 
> > inner hybrid
> > https://drupal.star.bnl.gov/STAR/system/files/hybrid_inner_v2_1-schematic.pdf
> > 
> > T-board
> > https://drupal.star.bnl.gov/STAR/system/files/T-Board_v3-schematic.pdf
> > 
> >     I think everything looks correct in these. One minor point is that we 
> > probably have to change the resistor values (on T-board and on hybrids) 
> > to have less reflection on the CLK and TRG lines. The cable has a 
> > characteristic impedance (differential) of around 100 to 110 Ohms. (It 
> > isn't very precisely controlled, we should measure it when we have the 
> > cable, but it will be around that value. So we should make the input 
> > impedance of T-board and hybrids assembly around 100-110 Ohms. I suggest 
> > changing the resistors R1, R2 on outer hybrid and on inner hybrid from 
> > 49.9 to 78.7 Ohm,
> 
> Jianing, if the proposed changes are fine to you. can you please update the 
> hybrids schematics accordingly? 
> 
> Yi, I understand that a company has assembled 6 inner hybrids w/o obvious 
> issue, but with the 49.9 Oh for R1/R2. Can they change them?
> 
> > and the leaving the resistors R9, R10, R11, R12 on the T-board at 33.2 
> > Ohm. Final values have to be confirmed after all the boards and cable are 
> > available for a scope measurement. At that time we _might_ decide to 
> > change the value on T-board; the 78.7 Ohm on hybrids is very likely to be 
> > fine (and is of course a lot more trouble to modify on existing boards, 
> > so we won't want to do that).
> >     [FYI in IST from the documents at 
> > https://drupal.star.bnl.gov/STAR/blog/yezhenyu/forward-silicon-tracker-ist
> >  the naively calculated input impedance 166 Ohms which is not right. I am 
> > not sure why, perhaps the documents are not really all correct. I think 
> > Ben did look at CLK & TRG waveforms with a scope and optimize these, 
> > although I don't have any record of it.]
> >     I will have a look at new outer hybrid layout for electrical / layout 
> > issues only -- not for mechanical interface issues -- but I expect no 
> > problems, it will look nice as the prior version did.
> 
> Gerard, it will be great if you can look at the new outer hybrid layout for 
> electrical / layout issues asap, so that we can move forward with the new 
> hybrid production. This has now become the bottleneck of the project. 
> 
> Best,
> Zhenyu
> 
> 
> >     Thanks,
> > 
> >             Gerard
> > 
> > 
> > On 10/31/2019 10:22 PM, 董家宁 wrote:
> >> Hi Gerard,
> >>   Thanks for your help.
> >>   There are no changes on the connector part.
> >>   Please let me know if you need any other files.
> >>   Thanks!
> >> Best,
> >> Jianing
> >>> -----原始邮件-----
> >>> 发件人: "Gerard Visser" <gvisser AT indiana.edu>
> >>> 发送时间: 2019-11-01 10:14:39 (星期五)
> >>> 收件人: star-fst-l AT lists.bnl.gov
> >>> 抄送:
> >>> 主题: Re: [Star-fst-l] Weekly FST meeting - 10/31/2019
> >>> 
> >>> hi Jianing, Zhenyu,
> >>>   Somebody was going to document (simply with a picture or two) how 
> >>> that the
> >>> connector tab of outer (particularly) hybrid fits well to the T-board on
> >>> mechanical structure. I think we should see this before the new outer 
> >>> hybrid is
> >>> ordered. (Is there any change in this aspect of the new outer hybrid? I
> >>> understood no change.)
> >>>   Meanwhile, yes it is in my inbox to check the electrical aspects, I 
> >>> will try to
> >>> have that done by early next week.
> >>>   Thanks,
> >>> 
> >>>           Gerard
> >>> 
> >>> 
> >>> On 10/31/2019 10:04 PM, 董家宁 wrote:
> >>>> Dear All,
> >>>> 
> >>>>    2.Hybrid, T-board:
> >>>> 
> >>>>    With the help of Mike and Gerard,  the address connection for the 
> >>>> temperature
> >>>> sensor chip on outer hybrid is modified and updated.
> >>>> 
> >>>>    And the schematic for T-board v3.0 is also updated (keep one set of
> >>>> temperature sensor and reset circuit).
> >>>> 
> >>>>    I think they are all waiting for the double check.
> >>>> 
> >>>>    If there are no other mistakes for outer hybrid layout, it will 
> >>>> take about 3
> >>>> weeks for the production.
> >>>> 
> >>>>    All the detailed status are listed on the WIKI
> >>>> (https://wiki.bnl.gov/star/index.php/Hybrid_and_T-board).
> >>>> 
> >>>> 
> >>>> Best,
> >>>> 
> >>>> Jianing
> >>>> 
> >>>> 
> >>>>     -----原始邮件-----
> >>>>     *发件人:*"Capotosto, Michael" <capotosto AT bnl.gov>
> >>>>     *发送时间:*2019-11-01 05:43:15 (星期五)
> >>>>     *收件人:* "Ye, Zhenyu" <yezhenyu AT uic.edu>, "star-fst-l AT lists.bnl.gov"
> >>>>     <star-fst-l AT lists.bnl.gov>
> >>>>     *抄送:*
> >>>>     *主题:* Re: [Star-fst-l] Weekly FST meeting - 10/31/2019
> >>>> 
> >>>>     All,
> >>>> 
> >>>>     As discussed last meeting, I’ve compiled the documentation and 
> >>>> posted it to
> >>>>     the wiki: https://wiki.bnl.gov/star/index.php/Cables
> >>>> 
> >>>>     T-Board/Inner Signal Cable:
> >>>> 
> >>>>     Last meeting we agreed we would use the IST-type of cables, due to 
> >>>> cost. It
> >>>>     turns out I misinterpreted the quote – we were quoted for 400ft of 
> >>>> cable but
> >>>>     they had a minimum 1,000ft order. It is cheaper as Gerard expected 
> >>>> to use
> >>>>     the Polypropylene/PVC/PVC cable. I’m waiting to hear back from 
> >>>> Gerard on how
> >>>>     he’d like to proceed. The updated quotes binder mentioned can be 
> >>>> found here:
> >>>>     
> >>>> https://drupal.star.bnl.gov/STAR/system/files/Cable%20Quotes%20Binder%2010-28-2019.pdf
> >>>>     
> >>>> <https://drupal.star.bnl.gov/STAR/system/files/Cable%20Quotes%20Binder%2010-28-2019.pdf>
> >>>>     The quotes binder also includes new updated (non-expired) quotes, 
> >>>> so once we
> >>>>     have a decision we can order the cables. (Elke/Gerard/Zhenyu, will 
> >>>> this be
> >>>>     on one of the BNL accounts, or will I be sending this to someone 
> >>>> else? If it
> >>>>     will be on a BNL account I can start drafting the PO so it will be 
> >>>> ready to
> >>>>     send when we make a final decision).
> >>>> 
> >>>>     Regarding the V2.1 T-Board modifications, I believe we just need 
> >>>> to remove a
> >>>>     handful of parts to in order to make it work, I’ve discussed this 
> >>>> in an
> >>>>     email with Jianing and Gerard, and am waiting to hear back from 
> >>>> Gerard. I
> >>>>     will have the cables re-labeled tonight before I leave (to match 
> >>>> the VIA REF
> >>>>     DES used in V2.1 T-Boards we are assembling). Once Gerard gives me 
> >>>> the O.K.
> >>>>     I’ll pull the parts off the boards, and we should be able to give 
> >>>> them to
> >>>>     the assembler within a working day or two. If there are no 
> >>>> objections, I
> >>>>     will extend the due date for the vendor to November 29.
> >>>> 
> >>>>     If I’ve missed any points please let me know.
> >>>> 
> >>>>     Best,
> >>>> 
> >>>>           Mike Capotosto
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