Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-04-19
Abstract： In order to meet the demand for elementary particle detection and analysis in high-energy physics experiments, modern pixel detector increasingly tends to pursue the performance requirements of low power consumption, high resolution, and high readout efficiency.This paper describes a silicon pixel detector digital-analogue hybrid readout chip named IMPix-N1. The pixel array consists of 16 rows × 16 columns of pixel units, each with an area of 100 μm × 100 μm, and the pixel array part is controlled by a 1-row × 8-column pixel unit as a superpixel, which has a common logic circuit. The chip has a pixel configuration mode and three pixel address readout modes of operation, which realises the measurement, storage and readout of the time, energy and position information of the hitting particles. The time-to-digital conversion circuit (TDC) can simultaneously measure and record the arrival time TOA and the over-threshold time TOT of the particles, with a time measurement accuracy of 5 ns. The IMPix-N1 is suitable for particle detection experiments requiring high temporal and spatial resolution as well as fast data acquisition capabilities.The chip as a whole is designed using the digital-on-top methodology in TSMC 180nm process. The design is simulated to verify the digital circuit of the pixel unit, the super pixel control circuit and the peripheral digital circuits, and the before and after simulation results are consistent and meet the design requirements.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-01-22
Abstract： Based on a UMC 55 nm CMOS process, this paper implements a 10 GHz high-performance charge pump phase-locked loop with high-speed output and low power consumption, which can provide a high-frequency differential clock for the data transmission system in particle physics experiments. A dual-branch charge pump with an operational amplifier and dummy MOSFETs is designed to reduce the influence of non-ideal factors on the circuit. A high-speed, low-power 64-divider circuit is designed to convert the 10 GHz differential clock output by the phase-locked loop into a 156.25MHz single-ended clock. An LC voltage-controlled oscillator is designed with a complementary cross-coupled structure, which enables fast start-up with low phase noise. The simulation results show that under the typical process corner, the phase noise of the VCO at 1 MHz frequency offset is -104.14 dBc/Hz. The PLL lock time is about 500ns, the power consumption is 22.34mW, and the peak-to-peak jitter is 6.59ps.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2023-06-15
Abstract： In nuclear physics and particle physics experiments, vertex and track detectors are mainly used to obtain the position, energy and time information of colliding particles. In recent years, MAPS (Monolithic Active Pixel sensors) have attracted wide attention in the field of detectors. Based on MAPS, a chip named Nupix-H2 will be designed using the domestic 130 nm CMOS process. The pixel array is 128 rows × 128 columns, and the individual pixel area is 22 μm × 22 μm. The readout mode is in Rolling Shutter row-by-row scanning mode, and the information of the pixel unit is output by column, and the scanning frequency is 40 MHz. In order to verify the feasibility of this chip, a test array of 1 row × 16 columns named is Nupix-H2- designed, and the energy information of this pixel array is read through a charge-sensitive amplifier, and the time information is measured by a counter, the system can achieve automatic reset. Simulation results show that the chip test array has an ENC of 30 e- or less, an energy resolution of ~5%, and a time resolution of 25 ns.
Subjects: Astronomy >> Astronomical Instruments and Techniques submitted time 2022-03-15
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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