Co-calibration of capacitor mismatch and comparator offset for 1-bit/stage pipelined ADC

Abstract

In this paper, we present a histogram-based two-phase calibration technique for capacitor mismatch and comparator offset of 1-bit/stage pipelined Analog-to-Digital Converters (ADCs). In the first phase, it calibrates the missing decision levels by capacitor resizing. Unlike previous works which require large capacitor arrays, only few switches are added to the circuit. The second phase performs missing code elimination. It achieves better calibrated linearity and provides better mismatch tolerance than the traditional digital calibration technique. Simulation results show that the proposed technique effectively improves both the static and dynamic performance.