Resonation-based Cascade ΣΔ Modulators for High-Linearity Broadband A/D Conversion

Abstract- This paper presents two new architec-tures of cascade ΣΔ modulators that, based on the use of resonation, allow to increase the effective resolution com-pared to previously reported topologies whereas keeping relaxed output swing and high robustness to non-lineari-ties of the amplifiers. In addition, the use of loop filters based on Forward-Euler integrators, instead of Back-ward-Euler integrators as proposed in earlier approaches, simplifies the switched-capacitor implemen-tation and makes the proposed architectures very suited for the implementation of highly-linear broadband A/D conversion†. I