TY  - CONF
AU  - Reckleben, Christian
AU  - Hansen, Karsten
AU  - Mulyanto, Budi
AU  - Chauhan, Ankur
TI  - A front-end circuit for a Monolithic Active Pixel Sensor in 65-nm CMOS Technology
PB  - DESY
M1  - PUBDB-2024-07028
PY  - 2024
AB  - This work presents an analog front-end circuitry implemented in a monolithic active pixel sensor (MAPS) fabricated in a 65-nm CMOS imaging technology. It combines the low-capacitance collection electrode (< 2 fF) and an analog processor featuring a charge-sensitive amplifier (CSA) driving a fast continuous-time threshold comparator. The CSA features a gain stage along with a Krummenacher-type feedback network. Its gain approximately amounts to 130 µV/e- and provides a rise time of 5 ns. The negative feedback provides leakage current compensation of the sensor diode and a continuous linear discharge of the feedback capacitor. This implements a time-over-threshold (ToT) measurement in combination with the comparator. Threshold voltage and Krummenacher-bias current can be adjusted pixel wise by using a 4-bit and 3-bit DAC, respectively. The prototype shows an input referred noise charge smaller than 35 e-rms. It takes an overall area of 500 µm2, the power consumption is less than 4 µW at a power supply of 1.2 V. Beside design aspects electrical and spectral characterization of a small pixel matrix will be shown in this work.
T2  - IEEE Nuclear Science Symposium
CY  - 26 Oct 2024 - 2 Nov 2024, Tampa (FL)
Y2  - 26 Oct 2024 - 2 Nov 2024
M2  - Tampa, FL
LB  - PUB:(DE-HGF)24
DO  - DOI:10.1109/NSS/MIC/RTSD57108.2024.10657527
UR  - https://bib-pubdb1.desy.de/record/617750
ER  -