Second order dynamic element matching technique for low oversampling delta sigma ADC

There has been an increased interest in design of that it can give better performance, if a modified noise broadband (data rate >IMSPS) delta sigma ADCs with over- transfer function NTF is used. sampling ratios (OSR) as low as four. Most of these designs are switched capacitor based and use internal multi-bit DACs. Section II discusses the performance limitations of first With the widely used first order dynamic element matching, order DWA. Section III analyzes the second order DEM the SNDR of these converters is limited by the inherent techniques. Section IV proposes a modified second order capacitor matching. We propose a modified second order DEM which gives significantly improved SNDR dynamic element matching technique to alleviate this problem performance for low OSR ADCs. The architecture of the for broadband ADCs, which target a SNDR greater than ADC used in this paper is chosen so that the quantization 100dB. noise is well below 100dB, at an OSR of 8. DEM is incorporated in ...

• Type: Conference
• Year: 2006
• Where: ISCAS
• Authors: A. K. Gupta, E. Sanchez-Sinencio, S. Karthikeyan, Wern Ming Koe, Yong-In Park
• Keywords: Delta Sigma Adcs, ISCAS 2006, Low Osr Adcs, Order Dem