  TIGER (Turin Integrated Gem Electronics for Readout) is a mixed-mode
front-end ASIC developed to readout the new inner tracking detector of the
BESIII experiment, carried out at BEPCII in Beijing. The detector is planned to
be installed during the 2018 upgrade and features an innovative three-layer
triple-CGEM (Cylindrical Gas Electron Multiplier) with analog readout. The ASIC
comprises 64 channels, each of which features a dual-branch architecture to
extract and digitize the timestamp and charge of the input signal. The
time-of-arrival is provided by a set of low-power TDCs, based on analog
interpolation techniques, while the charge measurement is obtained either from
the time-over-threshold information or the 10-bit digitization of the signal
peak amplitude. Fabricated in a 110 nm CMOS technology, the ASIC has been
designed to operate with an input capacitance of about 100 pF, an input dynamic
range between 1 and 50 fC, a power consumption of 10 mW/channel and a sustained
event rate of 60 kHz/channel.
