Performance of the AMT-3 based TDC system at Belle

The KEKB storage ring for a B-factory experiment at KEK, Japan, has been breaking the luminosity record of e
⁺
e
^-
colliders. Now the luminosity reaches 1.6 times larger than the designed luminosity. The Belle detector at KEKB uses a traditional readout method based on the trigger and delay: almost all of the digitizer is the same FASTBUS TDC whose intrinsic deadtime is not negligible in a recent high luminosity condition. To accommodate more higher luminosity, we developed new pipelined TDC module and its intrinsic deadtime is smaller than 10% of the current TDC. We report the performance of this TDC module.