학술논문
Radiation-hard ASICs for optical data transmission in the ATLAS pixel detector
Document Type
Conference
Author
Source
2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515) Nuclear science symposium Nuclear Science Symposium Conference Record, 2003 IEEE. 2:1233-1237 Vol.2 2003
Subject
Language
ISSN
1082-3654
Abstract
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. During ten years of operation at the LHC, the ATLAS optical link circuitry will be exposed to a maximum total fluence of 10/sup 15/ 1-MeV-equivalent neutrons per cm/sup 2/. We have successfully implemented both ASICs in a commercial 0.25 /spl mu/m 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. We present results from final prototype circuits and from irradiation studies of both circuits with 24 GeV protons up to a total dose of 57 Mrad.