Abstract

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 since the preliminary behavioral simulation phase, avoiding costly system parameters tuning in the transistor-level design phase. Behavioral simulations of a typical single-bit second-order SigmaDeltaM are performed to demonstrate the usefulness of the proposed study in the definition of proper circuit parameters.

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