ANALOG-DIGITAL CONVERTER

摘要

An analog-digital converter with successive approximation includes a capacitor array for being loaded by applying a given input signal potential and for providing a sampling potential, wherein capacitors of the capacitor array are serially coupled with switches. A decision latch is included for evaluating the sampling potential in a number of consecutive decision steps. The analog-digital converter also includes a logic unit for selectively changing the sampling potential by selectively switching switches associated to the capacitors of the capacitor array for each decision step based on an evaluation result of a previous decision step, wherein the switches are respectively coupled with a calibration switch.

主权项

1. An analog-digital converter with successive approximation, comprising:
a capacitor array configured to be loaded by applying a given input signal potential and configured to provide a sampling potential, wherein capacitors of the capacitor array are serially coupled with switches; at least one decision latch configured to evaluate the sampling potential in a number of consecutive decision steps; and a logic unit configured to selectively change the sampling potential by selectively switching switches associated to capacitors of the capacitor array for each decision step based on an evaluation result of a previous decision step; wherein at least one of the switches is coupled with at least one calibration switch; wherein the switches are configured to selectively connect the capacitors to a first reference potential for loading the given input signal potential and to a second reference potential depending on the evaluation result; and wherein the capacitors of the capacitor array are partitioned in capacitor groups related to a resolution bit of the analog-digital converter, wherein at least a part of the switches associated to the capacitors of the capacitor array of at least one of the capacitor groups is coupled with a respective one of the at least one calibration switch.