Development of a TDC to equip a Liquid Xenon PET prototype
  A Time to Digital Converter was designed (CMOS 0.35 $\mum) in order to be used in Liquid Xenon PET prototype. The circuit proved to be able to work at -120 degrees C, while showing a resolution of 250 ps. The circuit enables a low readout dead time (<90 ns) and provides a fully synchronous digital interface for easy data retrieval. 
O. Bourrion (LPSC), L. Gallin-Martel (LPSC)