Optimal design of opamps for oversampled converters

Feng Wang, Ramesh Harjani

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


The power consumption for various opamps used in ΣΔ modulators are considered. We first classify the different opamp topologies used in such modulators. We then develop a generalized integrator model that allows us to compare the power consumption for all these topologies. We also derive an expression for the minimum theoretical bound on the power dissipation. We illustrate our results with two design examples: a class A and a class AB opamp. It is shown that class A opamps are the best choice for ΣΔ modulators.

Original languageEnglish (US)
Pages (from-to)337-340
Number of pages4
JournalProceedings of the Custom Integrated Circuits Conference
StatePublished - 1996
EventProceedings of the 1996 IEEE Custom Integrated Circuits Conference - San Diego, CA, USA
Duration: May 5 1996May 8 1996


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