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4th International Conference on New Developments in Photodetection - BEAUNE 2005, Beaune : France
A large dynamic range integrated front-end for photomultiplier tubes
B. Genolini1, L. Raux2, C. de La Taille2, J. Pouthas1, V. Tocut2

A full custom analog CMOS circuit for obtaining a photomultiplier readout with a 16 bit resolution over 7 V has been developed. It is part of the R&D program for the photomultiplier tube front-end readout of the Pierre Auger Observatory northern site. It performs signal duplication and amplification with three gains: 0.15, 1 and 6. Each amplifier has a resolution of 10 bit and can measure signals with durations of several microseconds with a good baseline stability, for an input charge of up to tens of nano-Coulombs. The amplification is performed by current feedback amplifiers with a bandwidth of 60 MHz.The input impedance, adapted to the coaxial cables, is stable over the whole working range. A prototype was submitted in April 2004 and successfully tested. The linearity over the working range is less than 1%. It was also successfully tested on the Auger surface detector element installed at Orsay (comprised of a Cherenkov water tank equipped with Photonis XP1805 9” diameter photomultiplier tubes). The resolution over 7 V is 16.6 bit.This circuit is the first step towards a “system-on-a-chip” (SoC) solution for a photomultplier tube readout equipped with a fast ADC for signal digitization. A setup using a single cable for both the signal and the photomultiplier high voltage power supply was shown to be successful.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  LAL - Laboratoire de l'Accélérateur Linéaire
Physique/Physique/Instrumentations et Détecteurs

Sciences de l'ingénieur/Electromagnétisme
Front-end electronics – ASIC – Large dynamic range
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PI8_genolini.pdf(115 KB)