Silicon photomultipliers(SiPMs)have obtained a growing attention as an alternative to the traditional photomultiplier tubes in application on the fast detection of scintillation light thanks to their compactness,low cost,low operating voltage,high gain,high photon detection efficiency,excellent resolution for single photon detection,and insensitivity to magnetic fields[1].In considering larger detector sizes,however,the main drawback of the SiPM readout is their small active area.Devices with an active area in the range between 1 and 36 mm2 are now widely available.Usually,the small size of SiPMs can be compensated by using several SiPMs connected in parallel or in series,which is equivalent to a single large SiPM from the circuit viewpoint.In this report the effect of different connections on the shapes of output signals will be discussed.
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