CLARO docs page

What is CLARO

The CLARO is a chip designed for fast single photon counting with photomultipliers.
Its primary application is in the upgrade of the RICH detectors of the LHCb experiment at CERN.
LHCb PID Upgrade Technical Design Report

The main features of the CLARO are:


Paolo Carniti, Lorenzo Cassina, Claudio Gotti, Matteo Maino, Gianluigi Pessina
INFN and University of Milano Bicocca, Italy

Angelo Cotta Ramusino, Massimiliano Fiorini, Roberto Malaguti
INFN and University of Ferrara, Italy

Mateusz Baszczyk, Piotr Dorosz, Wojciech Kucewicz
AGH-University of Science and Technology, Krakow, Poland


The first version of the CLARO was the CLARO-CMOS, the first 4-channel prototype. It was designed in ams 0.35 um CMOS technology in 2011.
Tests with SiPMs
Radiation tolerance tests

A 2-channels prototype named CLARO-SiGe was also designed in 2011 in ams 0.35 um SiGe BiCMOS technology. It will not be considered here.


The CLARO8 is the latest version of the CLARO. It has 8 channels. The main improvements with respect to the CLARO-CMOS are:

Two prototypes were designed in 2014: the CLARO8v0 and the CLARO8v1.
The two designs are very similar and can be almost considered as the same chip.
CLARO8 manual v0.1

Burn-in board

The Burn-in board is a test board for the CLARO8 equipped with a socket that allows to quickly test the chips.
Here is a report describing the board design and the first tests on 35 CLARO8v0 samples:
Burn-in report v0.1


The CLARO FEB is the board hosting 8 CLARO8 chips designed for the elementary cell of the LHCb RICH upgrade.
FEB manual v0.1
FEB schematic v2.3
Pin map from PMT pixels to FEB outputs

This page was last updated on 1 October 2014