A 5mW 1.8V low over-sampling ratio ΣΔ modulator with 81 dB dynamic range

This work demonstrates that the ΣΔ modulator with a low oversampling ratio is a viable option for the high-resolution digitization in a low-voltage environment. Low power dissipation is achieved by design a low-OSR modulator based on differential cascade architecture, while large signal swing maintained to achieve a high dynamic range in the low-voltage environment. Operating from a voltage supply of 1.8 V, the sixth-order cascade modulator at a sampling frequency of 4-MHz with an OSR of 24 achieves a dynamic range of 81 dB for a 80-kHz test signal, while dissipating only 5 mW.