Details

Autor(en) / Beteiligte

• Gadkari, D.
• Shanks, K.S.
• Philipp, H.T.
• Tate, M.W.
• Thom-Levy, J.
• Gruner, S.M.

Titel

Characterization of an architecture for front-end pixel binning in an integrating pixel array detector

Ist Teil von

• Journal of instrumentation, 2020-11, Vol.15 (11), p.T11002-T11002

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Optimization of an area detector involves compromises between various parameters like frame rate, read noise, dynamic range and pixel size. We have implemented and tested a novel front-end binning design in a photon-integrating hybrid pixel array detector using the MM-PAD-2.0 pixel architecture. In this architecture, the pixels can be optionally binned in a 2×2 pixel configuration using a network of switches to selectively direct the output of 4 sensor pixels to a single amplifier input. Doing this allows a trade-off between frame rate and spatial resolution. Tests show that the binned pixels perform well, but with some degradation on performance as compared to an un-binned pixel. The increased parasitic input capacitance does reduce the signal collected per x-ray as well as increases the noise of the pixel. The increase in noise is, however, less than the factor of 2 increase one would observe for binning in post-processing. Spatial scans across the binned pixels show that no measured signal intensity is lost at the inner binning unit boundaries. In the high flux regime, at a 2×2 pixel wide beam spot (FWHM) size, binned mode responds linearly up to a photon flux of 107 x-rays/s, and performs comparably with un-binned mode up to a photon flux of 108 x-rays/s. While this study demonstrates a proof of concept for front-end binning in integrating detectors, we also identify changes to this early-stage prototype which can further improve the performance of binning pixel structures.