Alternative topologies for sigma-delta modulators - a comparative study
Document Type
Article
Date of Original Version
12-1-1997
Abstract
This paper investigates four frequently used modulator topologies, namely two single-stage and two multistage architectures. Simple parametric expressions are derived which describe minimum amplifier gain and bandwidth requirements for all implementations as well as C-ratio matching conditions for the two multistage circuits. The cumulative effect of all amplifier nonidealities, including slewing, is revealed by a discrete-time simulator. This study not only presents accurate quantitative results that illustrate the negative impact of the most stringent amplifier nonidealities but also provides the necessary insight to circumvent or minimize these parasitic effects which ultimately limit performance. ©1997 IEEE.
Publication Title, e.g., Journal
IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing
Volume
44
Issue
10
Citation/Publisher Attribution
Fischer, Godi, and Alan J. Davis. "Alternative topologies for sigma-delta modulators - a comparative study." IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing 44, 10 (1997): 789-797. doi: 10.1109/82.633433.