Analog to digital converter having dynamically controlled non-linear output

摘要

The output of an analog to digital converter is selectively controlled to provide a non-linear response by addition or removal of current from resistors in the ADC reference level resistor ladder so that voltage drops are reduced or increased across selected resistors. In one embodiment a current mirror is employed to remove current at selected nodes of the resistor ladder. Span current and current mirror current can be controlled so that span and the desired non-linearity will track when span is altered.