A Method to Correct Differential Nonlinearities in Subranging Analog-to-digital Converters Used for Digital γ-ray Spectroscopy
The influence on gamma-ray spectra of differential nonlinearities (DNL) in subranging, pipelined analog-to- digital converters (ADCs) used for digital gamma-ray spectroscopy was investigated. The influence of the DNL error on the gamma-ray spectra, depending on the input count-rate and the dynamic range has been investigated systematically. It turned out that the DNL becomes more significant in gamma-ray spectra with larger dynamic range of the spectroscopy system. An event-by-event offline correction algorithm was developed and tested extensively. This correction algorithm works especially well for high dynamic ranges.
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