FPIX2: a radiation-hard pixel readout chip for BTeV

A radiation-hard pixel readout chip, FPIX2, is being developed at Fermilab for the recently approved BTeV experiment [A. Kulyavtsev, et al., Proposal for an Experiment to Measure Mixing, CP Violation and Rare Decays in Charm and Beauty Particle Decays at the Fermilab Collider (2000), http://www-btev.fnal.gov/public_documents/btev_proposal/]. Although designed for BTeV, this chip should also be appropriate for use by CDF and DZero. A short review of this development effort is presented. Particular attention is given to the circuit redesign which was made necessary by the decision to implement FPIX2 using a standard deep-submicron CMOS process rather than an explicitly radiation-hard CMOS technology, as originally planned. The results (including the effects of irradiation to ∼33 Mrad) of initial tests of prototype 0.25 μm CMOS devices are presented, as are plans for the balance of the development effort.