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AC-LGAD readout and electronics meeting
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Description
https://riceuniversity.zoom.us/j/98405417492?pwd=YkZHSTBOOUMzQUxFMUlBa1hMUWhoZz09
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Meeting topics:
*Readout board updates and progress
*Updates on EICROC1 testing
*Far-forward module board/stave design updates
*AOB
Shipments from Omega
- Everything is here at BNL.
- ~ 60 EICROC1 (no metal fix)
- 2 EICROC1 testboards (no ASIC mounted)
- 3 EICROC0A testboards w/ ASICs mounted
Roman pots 1x3 ASIC module board/stave
- Discussion next week to look at the schematic/PCB layout with Jack --> Thursday morning (time TBD)
EICROC1 testing - Rachel Kovach-Fuentes (Rice)
- Initial ADC results look good - much less clock noise (if any) compared to EICROC0
- Acquisition window taken over fixed length of time (starts "randomly", stays open fixed amount of time, closes).
- Small structure seen (few DACu) at the same time bin in all pixels.
- Vref cannot be applied on a per-pixel basis, but when it is applied, it behaves as it should (shifts the ADC mean down, as expected).
- With Vref subtraction, the ADC tails look a little different.
- Alex: would be useful to look as a function of time bin, to see if there is a dependence on the time bin
- Laurent: Also look across the various pixels - see if the behavior is consistent.
Testing at BNL (verbal updates from Alex)
- Alex will get large AC-LGAD bonded (via IO - Don's group) to preamp board for testing.
- Still following up on issue of signal bipolarity with bump-bonded HPK sensor(s) with etching.
- Important to isolate the issue.
- Will begin initial testing with EICROC0A board this week.
- Tonko: Can you get EICROC1 bonded to the test boards?
- Yes, will coordinate with Don's group to add that to the list of tasks.
- Alex & Dominique: Alex tested the swapped resistors on the ZCU106-compatible EICROC0 (version 1) board and found them all to be fine, and the supplied voltages were correct. This excessive current draw does not appear to come from this.
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