Method for calibrating a multi-bit digital-to-analog converter, multi-bit digital-to-analog converter in with this method is applied and converter provided with such a multi-bit digital-to-analog converter

摘要

In a method for calibrating a multi-bit DAC intended, particularly, for application in high-speed and high-resolution ADCs, such as Σ Δ ADCs, and comprising a number of DAC cells, apart from the number of DAC cells applied in the multi-bit DAC for conversion, an additional DAC cell is provided, which can be interchanged with each of the other DAC cells in order to switch each DAC cell successively from the multi-bit DAC into a calibration circuit to calibrate said DAC cell without interrupting the conversion. The calibration circuit includes means for measuring errors in the DAC cell under calibration and means for correcting said DAC cell.