Design of a prototype ASIC for the MRPC front-end readout

Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-04-08

Zhuang Li Jiajun Qin Han Chen Jiaming Li Lei Zhao

Abstract： The Time of Flight (TOF) detector is an important component of nuclear and particle physics experiments, and Multi-gap Resistive Plate Chamber (MRPC) is widely used in TOF measurement systems due to its high time precision. The mainstream technique for the readout of the MRPC detector involves amplification and discrimination, combined with a Time-to-Digital Converter (TDC). To meet the requirements of high time precision, low power consumption, and high integration in MRPC readout electronics, a high-speed amplification and discrimination prototype chip has been designed. The chip integrates 8 channels, each of which includes a preamplifier, a discriminator, and an output driver circuit. The preamplifier adopts a common gate structure, facilitating impedance matching with low input impedance. The discriminator uses multiple cascaded amplifiers to provide enough gain, and achieves discrimination function by saturating amplification. After discrimination, the pulse signal is conveyed outside the chip via a Low-Voltage Differential Signaling (LVDS) driver, and its front edge and pulse width can characterize the time of arrival (TOA) and charge information of the MRPC signal. Based on 180 nm CMOS process, the circuit design, simulation and fabrication have been completed, and the performance test has been conducted in the laboratory environment. The test results indicate that the time precision is better than 10 ps (rms) with 100 fC ~ 2 pC injected charge and the single channel power consumption is approximately 24 mW.

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Very Large Area Gamma-ray Space Telescope (VLAST)

Subjects: Astronomy >> Astronomical Instruments and Techniques submitted time 2022-03-15

范一中 常进 郭建华 袁强 胡一鸣 李翔 岳川 黄光顺 刘树彬 封常青 张云龙 魏逸丰 孙志宇 余玉洪 孔洁 赵承心 藏京京 蒋维 潘旭 韦家驹

Abstract：

High energy gamma-rays carry the fundamental information  of the astrophysical sources in extreme conditions. The space detection of gamma-rays is distinguished by the wide energy range, the observation continuity as well as the high energy resolution.  With the experience in constructing and running the DArk Matter Particle Explorer (DAMPE), we propose a new satellite mission——Very Large Area gamma-ray Space Telescope (VLAST). VLAST has an acceptance of ~10 m²·sr at GeV energies and ~ 1 m²·sr at MeV energies. Together with a much better energy resolution, VLAST is expected to increase the sensitivity of Fermi Large Area Telescope by a factor of 10. In this work, the main scientific objectives, the detection principle, the payload and the expected performance of VLAST are introduced.

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Peer Review Status:Awaiting Review

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