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A new solution to implement efficient switched-capacitor (SC) ΣΔ modulators is presented. The proposed modulator scheme employs an improved SC integrator topology in which voltage buffers are properly introduced. This allows the desired modulator sampling frequency to be obtained by significantly reducing the power consumption with respect to other existing schemes. Design examples of a ΣΔ modulator...
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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