Abstract
High-Voltage CMOS (HVCMOS) pixel sensors are depleted active pixel sensors implemented in standard commercial CMOS processes. HVCMOS pixel sensors will be used, or are proposed, for several experiments: Mu3e, ATLAS, CLIC. Thanks to charge collection with a high electric field, HVCMOS sensors have potentially a very high time resolution. The time resolution is limited by the rise time of the amplifier. In this article, means for enhancement of time resolution are described: A compensation method shifting the detection time depending on the signal height, an enhanced comparator — the time walk compensating comparator — and the sampling of the signal.
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