Mainz 2004 – scientific programme

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T: Teilchenphysik

T 203: Halbleiterdetektoren III

T 203.6: Talk

Tuesday, March 30, 2004, 15:15–15:30, HS I

Radiation-Hard ASICs for Optical Data Transmission in the Atlas Pixel Detector — •Michael Ziolkowski, Peter Buchholz, Martin Holder, and Simon Nderitu — Universitaet Siegen, Fachbereich Physik, 57068 Siegen

We have developed two radiation-hard ASICs for optical data transmission in the ATLAS pixel detector at the CERN Large Hadron Collider (LHC). The first circuit is a driver chip for a Vertical Cavity Surface Emitting Laser (VCSEL) diode to be used for 80 Mbit/s data transmission from the detector. The second circuit is a Bi-Phase Mark decoder chip to recover the control data and 40 MHz clock received optically by a PIN diode on the detector side. We have successfully implemented both ASICs in a commercial 0.25 mm CMOS technology using standard layout techniques to enhance the radiation tolerance. Both chips are four-channel devices compatible with common cathode PIN and VCSEL arrays. Results from final prototype circuits and from irradiation studies of both circuits with 24 GeV protons up to a total dose of 57 Mrad are presented.