dorsal/arxiv
View SchemaDirect reading of charge multipliers with a self-triggering CMOS analog chip with 105k pixels at 50 micron pitch
| Authors | R. Bellazzini, G. Spandre, M. Minuti, L. Baldini, A. Brez, F. Cavalca, L. Latronico, N. Omodei, M. M. Massai, C. Sgro, E. Costa, P. Soffitta F. Krummenacher, R. DeOliveira |
|---|---|
| Categories | |
| ArXiv ID | physics/0604114 |
| URL | https://arxiv.org/abs/physics/0604114 |
| DOI | 10.1016/j.nima.2006.07.036 |
| Journal | Nucl.Instrum.Meth.A566:552-562,2006 |
Abstract
We report on a large active area (15x15mm2), high channel density (470 pixels/mm2), self-triggering CMOS analog chip that we have developed as pixelized charge collecting electrode of a Micropattern Gas Detector. This device, which represents a big step forward both in terms of size and performance, is the last version of three generations of custom ASICs of increasing complexity. The CMOS pixel array has the top metal layer patterned in a matrix of 105600 hexagonal pixels at 50 micron pitch. Each pixel is directly connected to the underneath full electronics chain which has been realized in the remaining five metal and two poly-silicon layers of a 0.18 micron VLSI technology. The chip has customizable self-triggering capability and includes a signal pre-processing function for the automatic localization of the event coordinates. In this way it is possible to reduce significantly the readout time and the data volume by limiting the signal output only to those pixels belonging to the region of interest. The very small pixel area and the use of a deep sub-micron CMOS technology has brought the noise down to 50 electrons ENC. Results from in depth tests of this device when coupled to a fine pitch (50 micron on a triangular pattern) Gas Electron Multiplier are presented. The matching of readout and gas amplification pitch allows to get optimal results. The application of this detector for Astronomical X-Ray Polarimetry is discussed. The experimental detector response to polarized and unpolarized X-ray radiation when working with two gas mixtures and two different photon energies is shown. Results from a full MonteCarlo simulation for several galactic and extragalactic atronomical sources are also reported.
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"abstract": "We report on a large active area (15x15mm2), high channel density (470\npixels/mm2), self-triggering CMOS analog chip that we have developed as\npixelized charge collecting electrode of a Micropattern Gas Detector. This\ndevice, which represents a big step forward both in terms of size and\nperformance, is the last version of three generations of custom ASICs of\nincreasing complexity. The CMOS pixel array has the top metal layer patterned\nin a matrix of 105600 hexagonal pixels at 50 micron pitch. Each pixel is\ndirectly connected to the underneath full electronics chain which has been\nrealized in the remaining five metal and two poly-silicon layers of a 0.18\nmicron VLSI technology. The chip has customizable self-triggering capability\nand includes a signal pre-processing function for the automatic localization of\nthe event coordinates. In this way it is possible to reduce significantly the\nreadout time and the data volume by limiting the signal output only to those\npixels belonging to the region of interest. The very small pixel area and the\nuse of a deep sub-micron CMOS technology has brought the noise down to 50\nelectrons ENC. Results from in depth tests of this device when coupled to a\nfine pitch (50 micron on a triangular pattern) Gas Electron Multiplier are\npresented. The matching of readout and gas amplification pitch allows to get\noptimal results. The application of this detector for Astronomical X-Ray\nPolarimetry is discussed. The experimental detector response to polarized and\nunpolarized X-ray radiation when working with two gas mixtures and two\ndifferent photon energies is shown. Results from a full MonteCarlo simulation\nfor several galactic and extragalactic atronomical sources are also reported.",
"arxiv_id": "physics/0604114",
"authors": [
"R. Bellazzini",
"G. Spandre",
"M. Minuti",
"L. Baldini",
"A. Brez",
"F. Cavalca",
"L. Latronico",
"N. Omodei",
"M. M. Massai",
"C. Sgro",
"E. Costa",
"P. Soffitta F. Krummenacher",
"R. DeOliveira"
],
"categories": [
"physics.ins-det",
"astro-ph"
],
"doi": "10.1016/j.nima.2006.07.036",
"journal_ref": "Nucl.Instrum.Meth.A566:552-562,2006",
"title": "Direct reading of charge multipliers with a self-triggering CMOS analog chip with 105k pixels at 50 micron pitch",
"url": "https://arxiv.org/abs/physics/0604114"
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