TIGER, a 64 channel mixed-mode ASIC for the readout of the CGEM detector in the BESIII experiment

A mixed-mode ASIC, TIGER (Turin Integrated Gem Electronics for Readout), optimized for the readout of the cylindrical GEM detector of the BESIII experiment is presented. The chip consists of 64 analog front-ends, each featuring a charge-sensitive amplifier followed by a dual-shaper. A low-power TDC and a 10 bit Wilkinson ADC with de-randomizing buffers allow to measure both the time-of-arrival of the event and the energy deposited by the impinging particles. The ASIC is designed for input capacitance up to 100 pF, event rates of 60 kHz per channel and maximum power consumption of 10 mW/channel. The chip is fabricated in a 110 nm CMOS technology.