Speaker
Description
A new single photon-counting IC prototype called SPECTRUM1k with pixel matrix 40 × 24 and pixel pitch 75 µm is developed by the Microelectronics Group of the AGH University of Krakow as a solution for X-ray color imaging. The chip, produced in CMOS 40 nm technology, is made up of 960 individually configured pixels, each composed of an amplifier, an analog-to-digital converter, and 64 × 12-bit memory cells that allow one to perform in-pixel energy histogramming. Thanks to the proposed architecture working with the 200 MHz chip clock and 1 Gcps/mm2 multi energy photon intensities up-to about 23 ms exposition time is feasible (365 µs exposition time whenever monoenergetic photons are used only). In-pixel offset (Ϭ = 3.5%) and gain (Ϭ = 5.8%) spread, the amplifier performance (ENC = 95 e- rms) and the ADC resolution (ENOB = 5.4 b) allow to convert the incoming photons’ energy with FWHM = 3.7 ke @134.2 keV upon 45 µW (high-speed mode) or 12 µW (low-speed mode) per pixel power consumption.
| Workshop topics | Front-end electronics and readout |
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