A low power front-end for GEM (Gas Electron Multiplier) detectors has been developed in 0.13 mu m CMOS node. The front-end sensitivity is 0.5mV/fC which remains almost unchanged up to a 15 pF detector parasitic capacitance. The input dynamic charge range varies from 30fC to 1pC including only a single (negative) polarity charge. The front-end provides as output signal two different time-domain square-wave signals. The first one indicates the charge detection event and the second one the amount of charge (providing a time-domain impulse, whose duty-cycle is proportional to the effective charge read by the front-end). Proper automatic calibration circuits are then implemented in order to optimize the front-end performance in case of CMOS process and temperature variations. The power consumption is 3.8mW, against 12mW in the existing market solutions[9]. A feed-forward opamp architecture has been exploited in analog part of read-out channel, in order to improve speed and time-response slope
Costantini, A., Pezzotta, A., Baschirotto, A., DE MATTEIS, M., D'Amico, S., Murtas, F., et al. (2012). A CMOS 0.13μm low power front-end for GEM detectors. In 2012 19th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2012 (pp.193-196) [10.1109/ICECS.2012.6463768].
A CMOS 0.13μm low power front-end for GEM detectors
COSTANTINI, ANDREA;PEZZOTTA, ALESSANDRO;BASCHIROTTO, ANDREA;DE MATTEIS, MARCELLO;GORINI, GIUSEPPE
2012
Abstract
A low power front-end for GEM (Gas Electron Multiplier) detectors has been developed in 0.13 mu m CMOS node. The front-end sensitivity is 0.5mV/fC which remains almost unchanged up to a 15 pF detector parasitic capacitance. The input dynamic charge range varies from 30fC to 1pC including only a single (negative) polarity charge. The front-end provides as output signal two different time-domain square-wave signals. The first one indicates the charge detection event and the second one the amount of charge (providing a time-domain impulse, whose duty-cycle is proportional to the effective charge read by the front-end). Proper automatic calibration circuits are then implemented in order to optimize the front-end performance in case of CMOS process and temperature variations. The power consumption is 3.8mW, against 12mW in the existing market solutions[9]. A feed-forward opamp architecture has been exploited in analog part of read-out channel, in order to improve speed and time-response slope
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