Electronics for Silicon Photomultipliers

Silicon Photomultipliers (SiPMs) are solid-state photodetectors based on densely packed matrices of Geiger-mode avalanche photodiodes (microcells) connected in parallel on a common silicon substrate. Each microcell operates above breakdown voltage and delivers a quantized current pulse when triggered by a single photon, enabling single-photon sensitivity, fast timing response and high gain comparable to traditional PMTs. The summed output current is proportional to the number of fired cells and therefore to the incident photon flux, making SiPMs ideal for applications requiring compactness, magnetic-field immunity and high photon detection efficiency.

CAEN electronics for SiPM systems are engineered to provide both ultra-stable bias distribution and low-noise, high-bandwidth signal processing tailored to the specific requirements of Geiger-mode photodetectors. These solutions integrate precision bias control (with temperature compensation and per-channel trimming), wideband front-end amplification, fast discrimination and digitization stages, ensuring optimal charge, timing and pulse-shape extraction even in high-rate environments. The portfolio supports scalable architectures ranging from single-detector laboratory setups to large multi-channel arrays used in nuclear and particle physics, medical imaging and photon-counting instrumentation, delivering deterministic performance, low jitter and full system integration flexibility.