A Study of the Low Voltage Supply and High Order ΔΣA/D Convertor Using the MASH Structure and the Swing-suppression A/D Conversion Circuit

Abstract

In recent years, the lowing supply voltage and the precising accuracy are required for ΔΣA/D converters. The swing-suppression circuit is proposed to reduce the supply voltage to nearly 1 V. However, this circuit cannot realize the high order shaping characteristics over the second order, and it is difficult to improve the accuracy. In this report, we propose the accuracy improvement method using MASH structure. Using 2-1 MASH structure and the 2^nd order swing-suppression A/D converter. To realize the third order shaping characteristic by the proposed method, the SNR of 86 dB are realized.