Low noise, high radiation hardness front-end circuits based upon an upgraded JFET monolithic process

A second series of monolithic preamplifiers based on epitaxial channel JFETs (junction field effect transistors) and intended for calorimetry at hadron colliders has been realized. The employed buried layer process has been upgraded, resulting in a lower pinch-off voltage and a reduced power dissipation. The results obtained from the first two batches of the monolithic N-JFET preamplifier have demonstrated that the circuit has achieved very satisfactory performance in terms of noise, dynamic behavior and radiation hardness