Title :
0.9 V 58 μW 92 dB SNDR audio ΔΣ modulator with high efficiency low noise switched-opamp and novel DWA technique
Author :
Wang, Huifang ; Zhao, Mengying ; Wu, Xiaojie ; Liu, B.
Author_Institution :
Inst. of VLSI Design, Zhejiang Univ., Hangzhou, China
Abstract :
A 0.9 V 58 μW 92 dB SNDR audio ΔΣ modulator is presented. Through combining the featured architecture with elaborately designed circuits, ultra-low-power operation is achieved. A power-efficient switched opamp (SO) with a new chopper stabilisation circuit for SO application is exploited to reduce power and minimise flicker noise. A novel data-weighted-averaging (DWA) technique is applied to sup press the harmonic distortion effectively.
Keywords :
delta-sigma modulation; operational amplifiers; DWA technique; audio ΔΣ modulator; chopper stabilisation circuit; data-weighted-averaging technique; harmonic distortion; high efficiency low noise switched-opamp; noise figure 92 dB; power 58 muW; voltage 0.9 V;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.7409
