| Y.Degerli, A.Besson, G.Claus, M.Combet, A.Dorokhov, W.Dulinski, M.Goffe, A.Himmi, Y.Li, and F.Orsini |
Recently, CMOS Monolithic Active Pixels Sensors (MAPS) have become
strong candidates for pixel detectors used in high energy physics
experiments. A very good spatial resolution can be obtained with
these detectors (lower than 5 microns). A recent fast MAPS chip,
designed on AMS CMOS 0.35 µm Opto process and called MIMOSA16 (HiMAPS2),
was submitted to foundry in June 2006. The pixel array is addressed row-wise.
The chip is a 128 x 32 pixels array where 8 columns have analog test
outputs and 24 have their outputs connected to offset compensated
discriminator stages. The array is divided in four blocks of pixels with
different conversion factors and is controlled by a serially programmable
sequencer. Discriminators have a common adjustable threshold. The
sequencer operates as a pattern generator which delivers control signals
both to the pixels and to the column-level discriminators. This chip is the
basis of the final sensor of the EUDET-JRA1 beam telescope which will be
installed at DESY in 2009. In this paper, laboratory tests results using a
55Fe source together with beam tests results made at CERN using
Minimum Ionizing Particles (MIPs) are presented. |
