SMASH Delta-Sigma Modulator with Adderless Feed-forward Loop Filter

摘要

A novel cascade modulator, which combines the benefits of\udSMASH topology and feed-forward loop filter, is presented in this\udletter. The proposed architecture is based on moving the powerhungry\udadder block from the quantizer input to the first integrator\udoutput. The proposed architecture shows a better OTA linearity and\udrelaxed OTA DC-gain compared to conventional MASH and SMASH\udtopologies. This feature makes the modulator topology more suitable\udthan conventional MASH and SMASH topologies for low-voltage\udapplications.