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The effect of operational amplifier (op-amp) phase margin on the performances of switched-capacitor (SC) sigma-delta modulators (SigmaDeltaMs) is analyzed. The investigation is carried out by performing behavioral simulations based on a second-order settling description for the SC integrator implemented by the op-amp. The analysis allows well-founded specifications for the amplifier to be defined...
The Slewing behavior of two-stage operational amplifiers (op-amps) with current-buffer Miller compensation (CBMC) is examined. It is shown that the current buffer used in the compensation network significantly affects the Slewing characteristics of the amplifier in typical switched-capacitor (SC) applications. On the basis of the amplifier behavior investigation, improved early-design rules are suggested...
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