IOP : Time resolution of a SiGe BiCMOS monolithic silicon pixel detector without internal gain layer with a femtosecond laser

Milanesio, M.; Magliocca, C.; Ferrere, D.; Moretti, T.; Iodice, L.; Saidi, J.; Gonzalez-Sevilla, S.; Nessi, M.; Cecconi, L.; Pinto, M. Vicente Barreto; Cardarelli, R.; Paolozzi, L.; Cardella, R.; Fenoglio, C.A.; Zambito, S.; Kugathasan, T.; Picardi, A.; Kotitsa, R.; Iacobucci, G.; Semendyaev, I.; Pizarro-Medina, A.; Elviretti, M.; Latshaw, A.; Iglesias, J. Sabater; Bonacina, L.; Rücker, H.

doi:10.1088/1748-0221/19/04/P04029

Article
Report number	arXiv:2401.01229
Title	Time resolution of a SiGe BiCMOS monolithic silicon pixel detector without internal gain layer with a femtosecond laser
Author(s)	Milanesio, M. (Geneva U.) ; Paolozzi, L. (Geneva U. ; CERN) ; Moretti, T. (Geneva U.) ; Latshaw, A. (Geneva U.) ; Bonacina, L. (Geneva U.) ; Cardella, R. (Geneva U.) ; Kugathasan, T. (Geneva U.) ; Picardi, A. (Geneva U. ; CERN) ; Elviretti, M. (IHP, Frankfurt) ; Rücker, H. (IHP, Frankfurt) ; Cardarelli, R. (Geneva U.) ; Cecconi, L. (Geneva U.) ; Fenoglio, C.A. (Geneva U.) ; Ferrere, D. (Geneva U.) ; Gonzalez-Sevilla, S. (Geneva U.) ; Iodice, L. (Geneva U.) ; Kotitsa, R. (Geneva U. ; CERN) ; Magliocca, C. (Geneva U.) ; Nessi, M. (Geneva U. ; CERN) ; Pizarro-Medina, A. (Geneva U.) ; Iglesias, J. Sabater (Geneva U.) ; Semendyaev, I. (Geneva U.) ; Saidi, J. (Geneva U.) ; Pinto, M. Vicente Barreto (Geneva U.) ; Zambito, S. (Geneva U.) ; Iacobucci, G. (Geneva U.)
Publication	2024-04-24
Imprint	2024-01-02
Number of pages	11
In:	JINST 19 (2024) P04029
DOI	10.1088/1748-0221/19/04/P04029
Subject category	physics.ins-det ; Detectors and Experimental Techniques
Abstract	The time resolution of the second monolithic silicon pixel prototype produced for the MONOLITH H2020 ERC Advanced project was studied using a femtosecond laser. The ASIC contains a matrix of hexagonal pixels with 100 μm pitch, readout by low-noise and very fast SiGe HBT frontend electronics. Silicon wafers with 50 μm thick epilayer with a resistivity of 350 Ωcm were used to produce a fully depleted sensor. At the highest frontend power density tested of 2.7 W/cm2, the time resolution with the femtosecond laser pulses was found to be 45 ps for signals generated by 1200 electrons, and 3 ps in the case of 11k electrons, which corresponds approximately to 0.4 and 3.5 times the most probable value of the charge generated by a minimum-ionizing particle. The results were compared with testbeam data taken with the same prototype to evaluate the time jitter produced by the fluctuations of the charge collection.
Copyright/License	publication: © 2024 The Author(s) (License: CC-BY-4.0) preprint: (License: CC BY 4.0)

$The layout of the monolithic pixel ASIC prototype. The pixel matrix consists of 144 hexagonal pixels of 65 $\mu$m side. Four analog pixels, highlighted in blue, have the preamplification stage directly connected to an analog driver with differential output. The yellow color of the bottom-left 6$\times$6 pixels is due to the more dense top-metal lines of this sub-matrix.$