The ASDQ ASIC [Central Outer Tracker CDF upgrade application]

The ASDQ ASIC provides eight channels of complete signal processing for the Central Outer Tracker (COT) being built for the CDF upgrade. The ASDQ has been fabricated using the well-characterized and radiation tolerant MAXIM SHPi analog bipolar process. It optimizes competing requirements of short measurement time (/spl ap/7 ns), good double pulse resolution (/spl sim/20 ns), low power (/spl ap/35 mW/ch) and low operational threshold (/spl sim/2-3 fC). It contains a low noise pseudo-differential preamplifier, ion tail compensation and multipole shaper, baseline restorer, comparator with an optional linear width encoded charge measurement and an on-chip calibration circuit. The design of the circuit is based on GARFIELD simulations of COT tracks and the response of a prototype chamber to cosmic rays and Fe/sup 55/ sources.