The Medipix3 chips have been designed to permit
spectroscopic imaging in highly segmented hybrid pixel
detectors. Spectral degradation due to charge sharing in the sensor
has been addressed by means of an architecture in which adjacent
pixels communicate in the analog and digital domains on an
event-by-event basis to reconstruct the deposited charge in a
neighbourhood prior to the assignation of the hit to a single
pixel. The Medipix3RX chip architecture is presented. The first
results for the characterization of the chip with 300 μm thick
Si sensors are given. ∼ 72e− r.m.s. noise and ∼ 40e− r.m.s. of threshold dispersion after chip equalization have been measured
in Single Pixel Mode of
operation. The homogeneity of the image in Charge Summing mode is
comparable to the Single Pixel Mode image. This demonstrates both
modes are suitable for X-ray imaging applications.
ASIC, we demonstrate that the spectroscopic information contained in the incoming photon beam can be recovered by the implementation in hardware of an algorithm whereby the signal from a single photon is reconstructed and allocated to the pixel with the largest deposition.
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