Analysis of the Impact of High-Order Integrator Dynamics on SC Sigma-Delta Modulator Performances

作者：Pugliese Andrea^*; Amoroso Francesco Antonio; Cappuccino Gregorio; Cocorullo Giuseppe

来源：IEEE Transactions on Circuits and Systems I-Regular Papers, 2010, 57(3): 618-630.

DOI：10.1109/TCSI.2009.2023946

• Behavioral modeling
• operational amplifier (opamp)
• settling time
• sigma-delta modulator (Sigma Delta Ms)
• switched-capacitor (SC) integrator
• transient response

The impact of high-order integrator dynamics on switched-capacitor sigma-delta modulator (Sigma Delta M) performances is investigated in this paper. An advanced generic integrator-settling model to take into account high-order dynamic effects is presented and validated by means of transistor-level simulations of circuits implemented in a commercial 0.35 mu m CMOS technology. The model is used through the paper to carry out an exhaustive behavioral analysis for second-order single-bit Sigma Delta Ms characterized by first-, second-, and third-order integrator dynamics, showing how high-order poles and zeros can affect the Sigma Delta M characteristics remarkably. The proposed analysis provides useful guidelines to fix a convenient integrator poles/zeros placement in order to achieve an effective Sigma Delta M design flow.

• 出版日期2010-3