The APV25 0.25 μm CMOS readout chip for the CMS tracker

The APV25 is a chip designed for readout of silicon microstrips in the CMS tracker at the CERN Large Hadron Collider. It is the first major chip for a high energy physics experiment to exploit a modern commercial 0.25 /spl mu/m CMOS technology. Experimental characterisation of the circuit shows excellent performance before and after irradiation. Automated probe testing of many chips has demonstrated a very high yield. A summary of the design, detailed results from measurements, and probe testing results are presented.