1. DCDC for 250nm Stave and ABC130 Hybrid - Revisited

2. Current DCDC Stavelet with DCDC tape added Converter and module power connections One-wire control Vin Gnd V+ Gnd V+ Gnd Detail

3. Proposed Topology with Star Point Converter retains original topology and orientation Converter mirrored 27.75 Star Point Power Feed to Converters (equidistant to power entry to hybrids and converters) 27.75 7.5 All dimensions in mm FILTERFILTER REG COIL FILTERFILTER REG COIL Input O/P Ideal “Balanced” topology (as a single board?) COIL /REG FILTERFILTER FILTERFILTER

4. ABC130 Left & Right Handed Hybrid - Modules 15mm 48.75mm 63.75mm 15mm 33.75mm 48.75mm Original proposal – same flavour hybrids Hybrid-module topology is asymmetrical Revised proposal – Left & Right handed hybrids Hybrid-module topology is symmetrical Sensor outline shown in blue

5. Left-Handed Hybrid “New” Right-Handed Hybrid Capacitor arrays used throughout for power supply decoupling and AC-coupling of stave-side signalling Supply decoupling 0508 100nF,10V Stave-side signalling 0508 & 0504 220pF, 50V HCC Bond pad detail revisited to accommodate different flavoured hybrids Results in a very linear layout in both instances Would still like HCC hybrid side bond pad I/O to be configurable i.e. Match the pads to differing hybrid topologies ABC130 common bus routing for the right-handed hybrid not so easy – but possible ABC130 Left & Right Handed Hybrid - Detail

6. ABC130 Common Bus Routing ABC130 Bus End Termination embedded within final ABC130 Left-Handed Hybrid Right-Handed Hybrid ABC130s rotated 180° on right-handed hybrid Bus connection is ‘locked’ to one side of ABC130 “Final” ABC130 is now adjacent to HCC Preferred direction of signal flow shown in blue Ease of routing with linear layout Minimises stub length connection to asics Results in ‘long’ trace length (~200mm) Increased capacitive load to HCC drivers ~40pF from trace alone (cf ~2pF/cm) Left-Handed hybrid has half the load Issue for HCC (fast data clock)? Or Route as an asymmetric T (shown red) End termination now moved to opposite end Consider Have receivers available on both sides of ABC130 Bus topology becomes as left-handed hybrid Need to understand more the implications of locking the ABC130 bus connection to one side of the device How does this impact the Endcap/Petals? End Termination embedded within final ABC130 ABC130 Bus End Termination for T bus