The new PETsys TOFPET3 ASIC

A new PETsys ASIC in the TOFPET series, named TOFPET3, has been developed aiming at high performance PET applications. The new chip has a 64-channel analog front-end with baseline stabilization, pulse tail cancelation, dark noise rejection and gain configuration. In each channel, three 10-bit digitization of pulses above a configurable threshold are performed (2 TDC, 1 QDC). The maximum event rate per channel is 500 kHz, and the output bandwidth is $3.8 \mathrm{~Gb} / \mathrm{s}$ matching the input rate. The new timing and energy circuits have outstanding performance: 1) the TOFPET3 contribution to CTR is 26 ps FWHM, implying that a CTR =80(120) ps due to crystal and SiPM, increases to 84(123) ps with TOFPET3; 2) the contribution to 511 keV photopeak resolution is 1.1% and the deviation to linearity is $\pm 1 \%$ in the range 300-3000 p.e for SiPM gain $3.5 \times 10^{6}$. Charge integration of single photons is possible with $\mathrm{S} / \mathrm{N}\gt10$. The chip includes four additional channels with sums of 16,32 or 64 cannels (configurable) suitable for light sharing applications, as well as advanced triggering features allowing the selective readout of a group of channels triggered by the energy of one channel. The power consumption is 8 mW per channel. In this summary we present simulation results of the chip performance. At the conference, measurements with the prototype chip will be presented.