ADC correction
The ADC correction applied to 2015 released data is described in paper A08: Planck 2015 results. High Frequency Instrument Data Processing 1 - Time-Ordered Information and Beam processing
This first step in ADC correction proved to improve data quality, in particular regarding low ell polarization. A second step correction is currently under study and it will be applied to further releases and described in more details.
analog to digital converter