Dinapoli, R,Campbell, M,Cantatore, E,Cencelli, V,Heijne, E,Jarron, P,Lamanna, P,O'Shea, V,Quiquempoix, V,Bello, DS,Snoeys, W,van Koningsveld, B,Wyllie, K,CERN,CERN

An analog front-end in standard 0.25 mu m CMOS for silicon pixel detectors in ALICE and LHCb

PROCEEDINGS OF THE SIXTH WORKSHOP ON ELECTRONICS FOR LHC EXPERIMENTS

2000

October

Published

1

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READOUT CHIP RADIATION TECHNOLOGIES

110

114

A new front-end has been implemented on a pixel detector readout chip developed in a commercial 0.25 mum CMOS technology for the ALICE and LHCb experiments. This technology proves to be radiation tolerant when special layout techniques are used,and provides sufficient density for these applications.A non-standard topology was used for the front-end, to achieve low noise and fast return to zero of the preamplifier to be immune to pile-up of subsequent input signals.The chip is a matrix of 32 columns each containing 256 readout cells. Each readout cell comprises this front-end and digital readout circuitry, and has a static power consumption of about 60 muW.The complete readout cell will be described, but the paper will be mainly focussed on the front-end section.