Browsing by Author "Dragone, A."

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    BeamCal Instrumentation IC: Design, implementation and test results
    (IEEE, 2011) Abusleme Hoffman, Ángel Christian; Dragone, A.; Haller, G.; Wooley, B. A.
    The BeamCal detector, one of the calorimeters in the forward region of the International Linear Collider detector, will serve three purposes: ensure hermeticity of the detector for small polar angles, reduce the backscattering from pairs into the detector center, and provide a low-latency signal for beam diagnostics. The BeamCal specifications in terms of noise suppression, signal charge, pulse rate and occupancy pose unique challenges in the front-end and readout electronics design. The Bean - BeamCal Instrumentation IC - is a 32-channel front-end and readout IC that will address the BeamCal instrumentation requirements. By employing switched-capacitor filters and a slow reset-release technique, the Bean will process the signal charge at the International Linear Collider pulse rate. Each channel will have a 10-bit successive approximation analog-to-digital converter and digital memory for readout purposes. The Bean will also feature a fast feedback adder, capable of providing an 8-bit, low-latency output for beam diagnostic purposes. This work presents the design and characterization of the Bean prototype, a 3-channel IC that proves the principle of operation described.
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    ECFA Detector R&D Panel, Review Report
    Abramowicz, H.; Abusleme Hoffman, Angel Christian; Afanaciev, K.; Aguilar, J.; Álvarez, E.; Bambade, P.; Bortko, L.; Bozovic-Jelisavcic, I.; Castro, E.; Chelkov, G.; Coca, C.; Daniluk, W.; Dragone, A.; Dumitru, L.; Elsener, K.; Emeliantchik, I.; Firu, E.; Fischer, J.; Fiutowski, T.; Ghenescu, V.; Gostkin, M.; Grzelak, G.; Haller, G.; Henschel, H.; Ignatenko, A.; Idzik, M.; Ito, K.; Kananov, S.; Kielar, E.; Kollowa, S.; Kotula, J.; Krumstein, Z.; Krupa, B.; Kulis, S.; Lange, W.; Levy, A.; Levy, I.; Linssen, L.; Lohmann, W.; Lukic, S.; Moron, J.; Moszczynski, A.; Nauenberg, U.; Neagu, A.; Novgorodova, O.; Nuiry, F.X.; Ohlerich, M.; Orlandea, M.; Oleinik, G.; Oliwa, K.; Olshevski, A.; Pandurovic, M.; Pawlik, B.; Preda, T.; Przyborowski, D.; Sato, Y.; Sadeh, I.; Sailer, A.; Schumm, B.; Schuwalow, S.; Schwartz, R.; Smiljanic, I.; Swientek, K.; Takubo, Y.; Teodorescu, E.; Wierba, W.; Yamamoto, H.; Zawiejski, L.; Zgura, T.S.; Zhang, J.
    Two special calorimeters are foreseen for the instrumentation of the very forward region of an ILC orCLIC detector; a luminometer (LumiCal) designed to measure the rate of low angle Bhabha scatteringevents with a precision better than 10−3 at the ILC and 10−2 at CLIC, and a low polar-angle calorimeter (BeamCal). The latter will be hit by a large amount of beamstrahlung remnants. The intensity and the spatial shape of these depositions will provide a fast luminosity estimate, as well as determination of beam parameters. The sensors of this calorimeter must be radiation-hard. Both devices will improve the e.m. hermeticity of the detector in the search for new particles. Finely segmented and very compact electromagnetic calorimeters will match these requirements. Due to the high occupancy, fast front-end electronics will be needed. Monte Carlo studies were performed to investigate the impact of beam-beam interactions and physics background processes on the luminosity measurement, and of beamstrahlung on the performance of BeamCal, as well as to optimise the design of both calorimeters. Dedicated sensors, front-end and ADC ASICs have been designed for the ILC and prototypes are available. Prototypes of sensor planes fully assembled with readout electronics have been studied in electron beams.
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    Mismatch of lateral field metal-oxide-metal capacitors in 180 nm CMOS process
    (INST ENGINEERING TECHNOLOGY-IET, 2012) Abusleme, A.; Dragone, A.; Haller, G.; Murmann, B.
    Metal-oxide-metal (MOM) capacitors represent an attractive alternative to metal-insulator-metal (MIM) capacitors in mixed-signal integrated circuits. Since they are made of metal lines, they can be integrated in standard CMOS processes, and tailored over a wide range of sizes. Mismatch data of MOM capacitors, however, is scarce and typically conservative. Presented is the design and the test results of a custom ADC that employs an array of 1024 MOM capacitors sized at 2 fF. Static performance metrics are presented and compared with those for an ADC based on MIM capacitors. Mismatch data is computed from the results.
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    Noise in Charge Amplifiers—A gm/ID Approach
    (2012) Alvarez Fontecilla, Enrique; Ávila Gárate, Diego; Campillo Mecklenburg, Hernan; Dragone, A.; Abusleme Hoffman, Ángel Christian
    Charge amplifiers represent the standard solution to amplify signals from capacitive detectors in high energy physics experiments. In a typical front-end, the noise due to the charge amplifier, and particularly from its input transistor, limits the achievable resolution. The classic approach to attenuate noise effects in MOSFET charge amplifiers is to use the maximum power available, to use a minimum-length input device, and to establish the input transistor width in order to achieve the optimal capacitive matching at the input node. These conclusions, reached by analysis based on simple noise models, lead to sub-optimal results. In this work, a new approach on noise analysis for charge amplifiers based on an extension of the gm/ID methodology is presented. This method combines circuit equations and results from SPICE simulations, both valid for all operation regions and including all noise sources. The method, which allows to find the optimal operation point of the charge amplifier input device for maximum resolution, shows that the minimum device length is not necessarily the optimal, that flicker noise is responsible for the non-monotonic noise versus current function, and provides a deeper insight on the noise limits mechanism from an alternative and more design-oriented point of view.