A Capacitive Quenching Circuit for Use with Single Photon Avalanche Detectors

In this thesis a Capacitive Quenching Circuit (CQC) is modelled using Linear Technology's Simulation Program with Integrated Circuit Emphasis (LT SPICE). Key components are optimised and the entire circuit is modelled. Once satisfied with the simulation, Printed Circuit Board (PCB) design is considered. Computer programs Intelligent Schematic Input System (ISIS) and Advanced Routing and Editing Software (ARES) are used to produce a schematic and a virtual PCB which was submitted for fabrication. The circuit is then constructed and the results are compared to modelled and published data.