PACIFIC: SiPM readout ASIC for LHCb upgrade

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 912; pp. 354 - 358
• Main Authors: de Cos, José Mazorra, Chanal, Hervé, Comerma Montells, Albert, Gascón Fora, David, Gómez Fernández, Sergio, Han, Xiaoxue, Pillet, Nicolas, Vandaelle, Richard
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21.12.2018
• Subjects: ASIC; LHCb; SiPM; Tracker; LHCb; Tracker; ASIC; SiPM
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2017.12.044

A new 64-channel mixed-signal ASIC is presented: PACIFIC. It was developed in TSMC 130 nm CMOS technology for the readout of the Scintillating Fibre Tracker, as a part of the LHCb upgrade. This detector is based on 250 μ m scintillating fibers readout by custom designed 128-channel silicon photomultiplier arrays. It will cover a total area of 340 m2, distributed over the 12 planes that compose it. The sensors are connected directly to PACIFIC without any interface components. The ASIC acquires the current pulses using a current conveyor. A fast double pole-zero cancellation shaper is used to minimize spillover. The charge is then collected using gated integrators, with a twofold interleaved scheme to minimize dead time. The resulting voltage level is digitized with a configurable 2 bit non-linear flash ADC. The output is a 320 Mbps differential signal produced by the serializers, which gather the results from four adjacent channels. •A new mix-signal silicon photomultiplier readout ASIC is presented.•Direct anode connection with voltage and impedance control at this node.•Fast shaping and integration with configurable 2-bit non-linear output.•It has demonstrated single photoelectron detection capability.