Power-efficient amplifier frequency compensation for continuous-time delta-sigma modulators

In this paper, we present a hybrid operational amplifier (opamp) frequency compensation topology to maximize a unity-gain bandwidth (UGBW) particularly for use in continuous-time delta-sigma modulators (CT ΔΣMs). Unlike well-known existing compensation topologies [1], the proposed compensation technique provides both a maximum UGBW and an adequate phase margin (PM) by appropriate non-dominant pole and zero positions. The proposed topology performance is validated by SPICE simulation using 28nm CMOS device models.