LAUSR

In the readout of silicon photomultipliers (SiPMs), the original current signals are usually divided into different channels — fast timing channels, slow energy channels, position encoding channels, facilitating the formation of different trigger types. This paper proposes a modified dynamic time over threshold (DTOT) method to obtain the energy information in the slow energy channel using the fast timing trigger of a 6 mm SiPM coupled to a 10 mm cubic GAGG scintillator. The dynamic threshold generator is triggered by a fast timing signal instead of the energy signal itself. The feasibility of this method was verified using a prototype circuit, wherein the integral nonlinearity was measured to be 1.5%. This method can easily introduce external triggers to the DTOT system, such as a coincident signal with a specific trigger logic, which can extend the application of the DTOT method.