The mixed-signal PRIMA-chip has been developed for sensitive-position silicon detector in proton imaging application. The chip is based upon the binary readout architecture which, providing fully parallel signal processing, is a good solution for high intensity radiation application. It includes 32-front-end channels with a charge preamplifier, a shaper and a comparator. In order to adjust the comparator thresholds, each channel contains a 8-bit DAC, programmed using an I2C like interface. The PRIMA-chip has been fabricated using the AMS 0.35 µm standard CMOS process and its performances have been tested coupling it to the detectors used in the tracker assembled for the pCT (proton Computed Tomography) apparatus.
The PRIMA chip contains 32 channels of front-end electronics to extract, shape and discriminate the signals from silicon strip detectors. The architecture consists in parallel signal processing chosen to obtain 1MHz acquisition rate, following the clinical requirement to reduce irradiation time.
The chip includes an analog part with 32 front-end channels and a digital part for DACs configuration by I2C protocol