KIP-Veröffentlichungen

Silicon photomultipliers (SiPMs) are a novel type of solid state photon detector,which have similar internal gain factors as Photomultiplier Tubes (PMT). Due to their low operation bias voltage, magnetic field immunity and small size, this new silicon photon detector can be used in a wide range of applications, such as Positron Emission Tomography (PET). The special features of SiPM such as large pixel number and high gain lead to a large current output in detection of 511keV photon in the PET application. Hence, a novel current-mode monolithic readout scheme can be implemented. As an important time pick-up unit, constant fraction discriminators are generally used in PET for coincidence measurement. Here, we report on a current mode constant fraction discriminator using a current mode non-delay-line method to generate the bipolar shape for the zero-crossing timing. One analog channel using this scheme has been designed and simulated in AMS 0.35μm CMOS technology. Both the design and simulation results will be presented.