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Performance of the Beetle readout chip for LHCB

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Microsoft Word - Proceedings.doc Performance of the Beetle Readout Chip for LHCb Niels van Bakel, Martin van Beuzekom, Eddy Jans, Sander Klous, Hans Verkooijen (NIKHEF Amsterdam, Free University of Amsterdam) Daniel Baumeister, Werner Hofmann, Karl-Tasso Knöpfle, Sven Löchner, Michael Schmelling, Edgar Sexauer‡ (Max-Planck-Institute for Nuclear Physics, Heidelberg) Martin Feuerstack-Raible§, Ulrich Trunk (University of Heidelberg) Neville Harnew, Nigel Smale (University of Oxford) MPIK / ASIC, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany [email protected] ‡ now at Dialog Semiconductor GmbH, Kirchheim/Teck-Nabern, Germany § now at Fujitsu Mikroelektronik GmbH, Dreieich-Buchschlag, Germany Abstract This paper presents the design and first measurements on the version 1.2 of the Beetle chip. The Beetle is a 128 channel pipelined readout chip which is intended for the silicon vertex detector, the inner tracker and the pile-up veto trigger of LHCb. In case of multianode photomultiplier tubes being used for the RICH readout, it is foreseen also to use the Beetle. Section II. gives a short overview of the chip architecture whereas section III. shows first measurements on the Beetle 1.2. In section IV. the results from a Total Ionizing Dose (TID) irradiation test is summarized, while an outlook on further tests given in section V. I. INTRODUCTION The development of the Beetle readout chip started in late 1998. Since this time the Beetle chip family has grown up to 3 complete readout chips (Beetle 1.0, 1.1 and 1.2) and 8 chips with different test structures and prototype components. Caused by a layout error, Beetle 1.0 had to be patched with a focused ion beam to become functional. Beetle 1.1 fix this bug among others but still a few problems remain: • Peaking time of the front-end is too slow: tpeak > 27 ns • Signal remainder 25 ns after peak is to large • Maximum input charge rate is s

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