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Silicon detectors with precision timing capabilities are playing an increasingly vital role in particle physics instrumentation. Among their many applications, pileup rejection and time-of-flight measurements at the Large Hadron Collider (LHC) stand out as prominent examples.
This presentation explores various silicon-based timing sensors, including silicon pad and pixel sensors, Low-Gain Avalanche Detectors (LGADs), Single-Photon Avalanche Diodes (SPADs), and Silicon Photomultipliers (SiPMs). We examine the primary factors that influence time resolution—such as Landau fluctuations, electronic noise, variations in signal shape due to the pad response function, and gain fluctuations. The fundamental limits to timing precision imposed by these effects, along with practical considerations and constraints in real-world applications, will be discussed.