SliT: A Strip-sensor Readout Chip with Subnanosecond Time-walk for the J-PARC Muon $g-2$/EDM Experiment
TetsuichiKishishita, YutaroSato, YoichiFujita
Jun 15, 2020
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arXiv: Instrumentation and Detectors
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Key Takeaway Key Takeaway: The SliT128C silicon-strip readout chip offers subnanosecond time-walk for muon anomalous magnetic moment and electric dipole moment measurements in the J-PARC muon $g-2$/EDM experiment.
Abstract
A new silicon-strip readout chip named ``SliT'' has been developed for the measurement of the muon anomalous magnetic moment and electric dipole moment at J-PARC. The SliT is designed in the Silterra 180~nm CMOS technology with mixed-signal integrated circuits. An analog circuit incorporates a conventional charge-sensitive amplifier, shaping amplifiers, and two distinct discriminators for each of 128~identical channels. A digital part includes storage memories, an event building block, a serializer, and LVDS drivers. A distinct feature of the SliT is utilization of the zero-cross architecture, which consists of a CR-RC filter followed by a CR circuit as a voltage differentiator. This architecture enables to generate hit signals with subnanosecond amplitude-independent time walk, which is the primary requirement for the experiment. The test results show the time walk of $\boldsymbol{0.38 \pm 0.16}$~ns between 0.5 and 3~MIP signals. The equivalent noise charge is $\boldsymbol{1547 \pm 75~e^{-}}$~(rms) at $\boldsymbol{C_{\rm det} =33}$~pF as a strip-sensor capacitance. Other functionalities such as a strip-sensor readout chip have also been proven in the tests. The SliT128C satisfies all requirements of the J-PARC muon $\boldsymbol{g-2}$/EDM experiment.