Characterization of the photon counting CHASE Jr., chip built in a 40-nm CMOS process with a charge sharing correction algorithm using a collimated X-Ray beam
PBN-AR
Instytucja
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
IEEE Transactions on Nuclear Science (35pkt w roku publikacji)
ISSN
0018-9499
EISSN
1558-1578
Wydawca
Institute of Electrical and Electronics Engineers
DOI
Rok publikacji
2017
Numer zeszytu
9
Strony od-do
2561--2568
Numer tomu
64
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.6
Słowa kluczowe
EN
charge sharing
C8P1
X-ray detectors
hybrid pixel detectors
photon counting readout chip
Streszczenia
Język
EN
Treść
This paper presents the detailed characterization of a single photon counting chip, named CHASE Jr., built in a CMOS 40-nm process, operating with synchrotron radiation. The chip utilizes an on-chip implementation of the C8P1 algorithm. The algorithm eliminates the charge sharing related uncertainties, namely, the dependence of the number of registered photons on the discriminator’s threshold, set for monochromatic irradiation, and errors in the assignment of an event to a certain pixel. The article presents a short description of the algorithm as well as the architecture of the CHASE Jr., chip. The analog and digital functionalities, allowing for proper operation of the C8P1 algorithm are described, namely, an offset correction for two discriminators independently, two-stage gain correction, and different operation modes of the digital blocks. The results of tests of the C8P1 operation are presented for the chip bump bonded to a silicon sensor and exposed to the 3.5- μm -wide pencil beam of 8-keV photons of synchrotron radiation. It was studied how sensitive the algorithm performance is to the chip settings, as well as the uniformity of parameters of the analog front-end blocks. Presented results prove that the C8P1 algorithm enables counting all photons hitting the detector in between readout channels and retrieving the actual photon energy.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:109117
CrossrefMetadata from Crossref logo
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