CALORIC: A Readout Chip for High Granularity Calorimeter

International audienceA very-front-end electronics has been developed to fulfil requirements for the next generation of electromagnetic calorimeters. The compactness of this kind of detector and its large number of channels (up to several millions) impose a drastic limitation of the power consumption and a high level of integration. The electronic channel proposed is first of all composed of a low-noise Charge Sensitive Amplifier (CSA) able to amplify the charge delivered by a silicon diode up to 10 pC. Next, a two-gain shaping, based on a Gated Integration (G.I.), is implemented to cover the 15 bits dynamic range required: a high gain shaper processes signals from 4 fC (charge corresponding to the MIP) up to 1 pC, and a low gain filter handles charges up to 10 pC. The G.I. performs also the analog memorization of the signal until it is digitalized. Hence, the analog-to-digital conversion is carried out through a low-power 12-bit cyclic ADC. If the signal overloads the high-gain channel dynamic range, a comparator selects the low-gain channel instead. Moreover, an auto-trigger channel has been implemented in order to select and store a valid event over the noise. The timing sequence of the channel is managed by a digital IP. It controls the G.I. switches, generates all needed clocks, drives the ADC and delivers the final result over 12 bits. The whole readout channel is power controlled, which permits to reduce the consumption according to the duty cycle of the beam collider. Simulations have been performed with Spectre simulator on the prototype chip designed with the 0.35 µm CMOS technology from Austriamicrosystems. Results show a non-linearity better than 0.1 % for the high-gain channel, and a non-linearity limited to 1 % for the low-gain channel. The Equivalent Noise Charge referred to the input of the channel is evaluated to 0.4 fC complying with the MIP/10 limit. With the timing sequence of the International Linear Collider, which presents a duty cycle of 1 %, the power consumption of the complete channel is limited to 43 µW thanks to the power pulsing. The total area of the channel is 1.2 mm2 with an analog memory depth of 16

The CaloRIC ASIC: Signal Processing for High Granularity Calorimeter

International audienceA readout ASIC called CaloRIC, has been developed to fulfil the signal processing requirements for the Silicon-Tungsten (Si-W) electromagnetic calorimeter of the International Linear Collider (ILC). This ASIC performs the complete processing of the signal delivered by the Si-PIN diode of the detector: charge sensitive amplification, shaping, analog memorization and digitization. Measurements show a global integral non-linearity better than 0.2% for low energy particles, and limited to 2% for high energy particles. The measured Equivalent Noise Charge (ENC) is evaluated at 0.6 fC, which corresponds to 1/6 times the signal released by a Minimum Ionizing Particle (MIP). With the timing sequence of the ILC, the power consumption of the complete channel is evaluated at 43 mu W using a power pulsing. A new ASIC (CaloRIC 4ch) with four improved readout channels has been designed and is ready for manufacturing

FATALIC, a wide dynamic range integrated circuit for the tilecal VFE Atlas upgrade

MICRHAU, Pôle de microélectronique Rhône-AuvergneThe ATLAS upgrade will require more efficient electronics to fulfil the new performances expected by the experiment. Concerning the readout electronics of the Tile Calorimeter, the replacement of the 3in1 board by an integrated circuit is under study. The proposed circuit is composed of a multi-gain current conveyor, followed by shapers, an integrator for the calibration and an analog-to-digital converter. This solution presents better performances, concerning the noise, and the power consumption. Two prototype chips have been submitted using the IBM 130nm CMOS technology: one with a three gains current conveyor, another with an enhanced current conveyor associated with shapers

Calorimetry for Lepton Collider Experiments - CALICE results and activities

see paper for full list of authorsThe CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed

Calorimetry for Lepton Collider Experiments – CALICE results and activities

The CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed