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The Medipix4 chip is the latest member in the Medipix/Timepix family ofhybrid pixel detector chips aimed at high-rate spectroscopic X-ray imagingusing high-Z materials. It can be tiled on all 4 sides making it ideal forconstructing large-area detectors with minimal dead area. The chip is designedto read out a sensor of 320 x 320 pixels with dimensions of 75 {\mu}m x 75{\mu}m or 160 x 160 pixels with dimensions of 150 {\mu}m x 150 {\mu}m. Thereadout architecture features energy binning of the single photons, whichincludes charge sharing correction for hits with energy spread over adjacentpixels. This paper presents the specifications, architecture, and circuitimplementation of the chip, along with the first electrical measurements.

High-rate, high-resolution single photon X-ray imaging: Medipix4, a  large 4-side buttable pixel readout chip with high granularity and  spectroscopic capabilities