A Second-Order NS Pipelined SAR ADC With Quantization-Prediction-Unrolled Gain E

Abstract

This article presents a second-order noise shap- ing (NS) pipelined successive approximation register (SAR) analog-to-digital converter (ADC) with fully passive NS and a second-order gain error shaping (GES) based on a Quantization- Prediction-Unrolled scheme. The GES is enabled by subtracting the residue voltage with a predicted quantization error through a second-order digital GES filter. Utilizing an auxiliary SAR ADC for the prediction retains an outstanding GES ability and avoids deteriorat