Abstract
This paper presents a front-end 16-channel readout chip to be coupled with PMs (photomultipliers) or APDs (avalanche photodiodes), which is designed in a BiCMOS process for a fast beam tagging system used in ion-therapy. Each channel consists of a current conveyor and two separate output stages: one is a current comparator for signal event detection, and the other is a charge sensitive amplifier (CSA) for signal charge measurement. The current conveyor employs super-common-base (SCB) transistor structure, which allows the input impedance to be as low as a few ohms. The current-mode architecture with current comparator also makes it possible to improve performances especially in speed and dynamic range.
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