WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 11, 2012
Switched-Current Techniques: An Overview of Cumulative SI-Related Errors on Dynamic and Static Performances of 2nd Order LP-ΣΔMs
Authors: ,
Abstract: We present in this work a systematic analysis to identify Sigma Delta Modulators (ΣΔMs) nonidealities, such as charge injection error, I/O conductance ratio error and settling time error. A physical mechanism behind Switched Current (SI) errors is proposed. In the first time, errors mentioned above are treated separately and a behavioural model of SI cell is derived for each non-ideality. In the second time, we propose a behavioural model of Non-inverting Lossless Integrator. For typical variations of SI-related errors, simulations have been made using Matlab/Simulink. Finally we present their influences on both dynamic and static performances of the 2nd order SI Low Pass ΣΔMs (SI-LPΣΔMs).
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Keywords: ADC converter, Switched Current technique, Sigma-Delta Modulator, error mechanisms, Dynamic and Static Performances