Paper Info
Title
Effect of OPAMP Input Offset on Continuous-Time $DeltaSigma$ Modulators With Current-Mode DACs
Abstract
This paper analyzes the effect of operational amplifier (OPAMP) input offset on continuous-time (CT) delta-sigma $(DeltaSigma)$ modulators with current-mode feedback digital-to-analog converters (DAC). Our analysis shows that the input offset leads to either increased harmonics or increased noise floor of the modulator, depending on whether a DAC shuffling scheme, such as data-weighted averaging (DWA), is applied or not. Analysis and mathematical derivation are given and verified by transistor-level simulations. An input-offset cancellation scheme is proposed and demonstrated by simulation results.
Year
DOI
Venue
2015
10.1109/TCSI.2015.2434098
Circuits and Systems I: Regular Papers, IEEE Transactions
Keywords
DocType
Volume
Continuous-time (CT),data-weighted averaging (DWA),delta-sigma $(DeltaSigma)$ modulator,input offset cancellation,operational amplifier (OPAMP)
Journal
62
Issue
ISSN
Citations 
7
1549-8328
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Wang, R.100.34
Dexiu Huang213813.48
Tingting He334861.04
Jingdong Chen41460128.79