Background Calibration of Time-Interleaved SAR A/D converters
Dusan Stepanovic and Borivoje Nikolic
The goal of this research is to build a power efficient A/D converter in gigahertz sampling frequency range and with moderate resolution of 7-8 bits. An attractive approach to tackle this challenging task is to use multiple time-interleaved converters with power efficient architecture such as successive approximation register converters (SAR). For ultimate power efficienty (thermal noise limited regime)the problem that needs to be solved, in addition to channel mismatch effects, is the linearity of the individual channels. We propose a novel deterministic calibration technique with rapid convergence that unifies the correction of channel mismatch effects and nonlinearities of individual SAR converters.