A Pipelined A/D Conversion Technique with Low INL and DNL

A capacitor switching technique for 1.5-bit/stage pipeline A/D converters is presented. This technique improves both integral nonlinearity (INL) and differential nonlinearity (DNL) performance due to capacitor mismatch. Monte Carlo simulation is carried out with all components´ mismatches considered. The results show that the INL can be improved by 2.5 times and the DNL can be improved by 5 times. Comparing with the conventional capacitor mismatch calibration techniques, the proposed technique has the characteristics such as simple calibration circuits, undegraded conversion rate, and insensitive to the operation environment.