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Liverpool Status Update: Power Protection Replacement Board & Module Preparation

Check the latest Liverpool status on power protection replacement boards and module preparation for DCDC stavelets, including issues and solutions found during testing and updates. Stay informed and up-to-date with the progress.

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Liverpool Status Update: Power Protection Replacement Board & Module Preparation

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  1. Liverpool Status • Since last time • Power Protection Replacement Board done • Check if it recovers DTnoise • Quick submission – proof of principle • Provides for serial powering of modules (not hybrids) • Simple drop-in replacement for existing PPBs • 93.5mm x 5mm • Received in RAL this week • Module/Hybrid Twiki being set up: https://twiki.cern.ch/twiki/bin/viewauth/Atlas/ShortStripsHybridLiverpool • Provides information regarding hybrids – layout files (gerbers), BOM, schematics, etc. • Module frames and their connections (Power, data I/O, …) • Miscellaneous information (LVDS buffer board) • Hooking up to HSIO • Updated regularly... • 2 Modules delivered to RAL last week • For DCDC stavelet • Made with FZ2 sensors (Modules: M13 & M15) • 2 more modules, M16 & M17 (nearly) ready in Liverpool (see later), again made with FZ2 sensors • M16 now tested ok, M17 to be tested soon • 1 module, M14, made with FZ1 sensor. Retain as spare • HSIO now hooked up to hybrid(s) for readout • Identified problem with DCLK – BCO timing, modification of start up script solved the problem • Using CLKmode80 set to logic 1 (simple wire bond change on hybrid) • Now testing with 80MHz DCLK (as presently used on Stavelets) and not 40MHz • L1Delay in the hybrid configuration revised to 129 (was 132 due to BCC latency) – otherwise calibration out of time

  2. Liverpool Status • Continued... • Started preparing 2 outstanding modules for DCDC stavelet • Initially identified a problem with a single BCCV2 on module M16 (non working DCLK) • Replaced early this week (BCC courtesy of RAL) • Full electrical test performed (3pt Gain, Trim, etc.) • Minor issue identified with low gain on 2 ABCN25s (≥100mV/fCinstead of 110mV/fC) – DAQ issue • Revisited module but unable to readout – identified problem with a BCC • Same BCC location as before - non working DCLK (again) • Further investigation revealed hybrid voltage not being regulated properly • Starts up ok with hybrid voltage at 2.52V (at power entry of hybrid) • Revisit a bit later now measuring >2.8V • Problem identified with Mshunt control circuit – one end of resistor not soldered • Open circuit connection forces control circuit to (erroneously) over compensate hybrid voltage • Reflowing solder joint fixes the problem – circuit now regulates properly and module fully functioning • Recommendation gone out that all sites, with hybrids, visually inspect Mshunt circuit for quality of soldering

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