Methods to eliminate dynamic errors in high-performance SAR A/D converter

The DNL performance of the last generation of Analog-to-Digital Converter (A/D Converter, ADC) based on the principle of SAR (successive-approximation register) was limited by a small amount of spikes at particular codes that changed with varying conversion rate, so that these errors were called ´dynamic errors´. These errors always appeared in pairs: a long code followed by a short code at very particular transitions. This paper is discussing the root source and techniques that fix the problem. These techniques were implemented and verified on silicon.