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Test results of VA1 fabricated by sub-micron Masashi Yokoyama

Summary: Test results of VA1 fabricated by sub-micron
Masashi Yokoyama
University of Tokyo, Department of Physics
Hongo 7-3-1, Bunkyo-ku, Tokyo
We have developed VA1 VLSI chip with AMS 0.35 Ám process. DC current com-
pensation circuit is integrated. Preliminary measurement results indicate DC com-
pensation circuit works well up to 300 nA. Radiation hardness of the new chip is
measured and confirmed to be better than 20 Mrad.
1 Introduction
Due to a late-stage change of plans, the current BELLE SVD (SVD 1.0) was
constructed in a very short time (roughly one year from design to commission-
ing). Although its basic performance is satisfactory, its design[1] leaves room
for improvement. The most important limitation of SVD 1.0 is its limited radi-
ation tolerance. Although the frontend IC, the VA1, remains functional to 200
kRad, it exhibits a significant increase in noise at lower levels. Moreover, the
200-kRad level affords almost no margin for error in accelerator and detector
Failure of the integrated AC-coupling capacitors in the DSSDs is another


Source: Aihara, Hiroaki - Department of Physics, University of Tokyo


Collections: Physics