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 language||English (US)|
|Number of pages||4|
|Journal||Proceedings of the Custom Integrated Circuits Conference|
|State||Published - 1996|
|Event||Proceedings of the 1996 IEEE Custom Integrated Circuits Conference - San Diego, CA, USA|
Duration: May 5 1996 → May 8 1996