1 WP3 Bi-Weekly Meeting Activities at Liverpool 1.Evaluation of Compact DCDC converter Designed to match up to an ABC130 module 2.Status of FIB’d hybrid/module Used to evaluate ABC130 asics when coupled up to an ATLAS large area sensor

2 Compact DCDC Converter Provisional layout finished last year Primarily used to check whether it is possible to fit a converter within the allocated space on an ABC130 module Space available is 8mm x 45mm (STV10 converter comes in at 13mm x 28mm) Based on CERN STV10 circuit with sensor HV filtering added with 1-wire control retained Final layout finished by Sam Powell, submitted for manufacture first week of February Circuit geometry is 8mm x 44mm Height is still a challenge – target height for Stave integration (for any powering) is at best 5mm (worst case is 3.5mm) 16.5mm 8mm Thermo-Mechanical Module with compact DCDC converter Shield box height ~6.5mm

3 Compact DCDC Converter – first results Board Dimensions (L x W x H): 44 x 8 x Layer build using 1oz Cu Hand wound elliptical inductor (200nH/26mΩ) Tested with reduced sized components (mass reduction) Input Noise: 600e (598e) Input Noise: 602e (604e) Leakage from shield box (~15e increase) Reference measurement shown in brackets (CERN SM01C converter) Test on ABCN-25 module Tested with Buck regulator switching frequency increased from 2MHz to 4Mz In principle should allow smaller sized components to be used, making integration/packaging easier Inductor now ~110nH (was originally ~220nH) and DC resistance ~14mΩ (was ~26mΩ) – should improve efficiency Input noise is more or less identical to previous measurements using larger coil at 2MHz Input noise is 600e – 603e (compare to above) with clean DTN down to 0.5fC threshold Efficiency is coming in at ~77% at 2A (predicted ABC130 module current consumption) Was originally 70-72% operating at 2MHz DTN at 0.4fC Only see evidence of converter at 0.4fC, all other threshold settings show approx zero occupancy

4 FIB Hybrid Used as test vehicle to evaluate multiple ABC130s being readout Part of ongoing evaluation of ABC130 asics Checks data passing between multiple devices Coherent affects due to multiple devices being powered, clocked and triggered Ultimate goal is to hook up to an ATLAS large area sensor Check noise performance and stability Chip IDs Chips 5:9 are FIB’d versions The reality Circuit comes as a thin build FR4 3 layers of ~350µm build thickness Trying to emulate flex circuit build... Slightly oversize in length for handling Will overhang sensor Circuit will come with 10 ascis attached 5 off FIB’d and 5 off non-FIB’d Due to cost of FIB’d asics All 10 chips linked serially (for data readout) Only 5 FIB’d chips can ever be readout These devices have dedicated data paths as well Backup in case serial readout doesn’t work Should still be able to configure ALL chips Used to test power consumption etc.

5 FIB Module Test Frame Power Return Power In HVRet HV NTC monitor DCDC Plugin (rotated 180° compared to CERN type) Serial Power Monitor – leave open circuit Samtec connection to ABC130 Driver Board Sensor HV filter DCDC Pin1

6 FIB Hybrid - Status 2 Hybrids will go down to RAL beginning next week Both hybrids nearly ready to go Will be finished today/early tomorrow First hybrid with 10 off non-FIB’d asics attached Should still be able to power/clock and configure devices – but no data readout Used as sanity check when plugged into DAQ Paves the way for the real object Only then will second FIB’d hybrid be plugged into DAQ for evaluation Upon successful testing of hybrid at RAL bring back both circuits to Liverpool For construction into a module Then re-test as a module, at Liverpool. Aim is for results for Upgrade week at Freiburg...