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VMM1 - An ASIC for micropattern detectors

We present VMM1, the first prototype of a family of front-end ASICs designed for the ATLAS muon upgrade. The ASIC will operate with MICRO MEG AS and TGC detectors providing charge and timing measurements along with a number of features including sub-hysteresis discrimination, address of the first event in real time, and digital output per channel for Time-over-Threshold measurements. The shaper, designed using the concept of Delayed Dissipative Feedback (DDF), allows analog dynamic ranges in excess of 10,000. With a capacitance of 200 pF and a nominal peaking time of 25 ns it can provide charge and timing resolution below 1 fC and Ins respectively, for input charges up to 2 pc. Designed in a commercial 130 nm technology it dissipates about 4.5 mW per channel.