A CMOS analog-digital integrated circuit for charged particle spectrum measurements

The authors present a CMOS analog-digital integrated circuit implemented using metal oxide semiconductor implementation system (MOSIS) fabrication to be used for nuclear radiation measurements. They have implemented a charge sensitive preamplifier, operational amplifiers, RC filters, a peak detector, low-voltage comparators, a low-voltage analog switch, logic and control circuits, flip-flops, and counter cells. On the system level they have built an analog-digital block, suitable for charged particle spectrum measurements, using an external solid-state detector. The particle energy spectrum is measured in 10 channels and stored in equinumber 11-b registers, which can then be selectively addressed, read out, and reset. The overall noise performance with no detector connected is equivalent to 10-keV proton energy. The whole system can resolve particle counting rates as high as 1.5*10/sup 5/ counts/s, and as high as 10/sup 6/ in the pulse height analyzer (PHA) mode.<>