A 24-OSR to Simplify Anti-Aliasing Filter 2MHz-BW 83dB-DR 3rd-order DT-DSM using FIA-Based Integrator and Noise-Shaping SAR Combined Digital Noise-Coupling Quantizer

This paper proposes a dynamic circuits-based discrete-time (DT) delta-sigma modulator (DSM) with 2MHz bandwidth (BW) at an oversampling ratio (OSR) of 24 to simplify anti-alias filter (AAF), flexible operating frequency, and power scalability. The proposed DSM consists of floating inverter amplifier (FIA) based integrators and an asynchronous SAR quantizer that combines passive noise shaping (PNS) and digital noise coupling (DNC) to enhance total noise shaping effect equal to the 3rd-order DSM. This DT-DSM achieves 83.1dB dynamic range (DR) while consuming 1.04mW, resulting in 175.9dB DR-based Schreier FoM.