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|dsmpaper.pdf||Design & Evaluation of a Metrology Class, Delta-Sigma Analogue to Digital Converter
for the LHC project at CERN.
Allan Belcher1, John Pett2 & John Pickering3
Signal Conversion Ltd, Swansea, UK 2SL Group, CERN, Geneva, Switzerland
Metron Designs Ltd, Norwich, UK
The new LHC (Large Hadron Collider) particle accelerator, currently under construction at CERN, Geneva, will
employ some 1700 converters powering cryogenic magnets to steer twin beams around the 27km ring. The
critical positioning of the beams is dynamically controlled by adjusting the magnet current from near zero to
some 13kAmps to track a pre-determined current profile to within a few parts per million (ppm).
The control is performed in a digital loop requiring A-D conversion capable of sub ppm performance at real
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