14-bit DR, 20 kHz BW, 2-2 MASH SI-Σ㪔 modulator using low-distortion feedforward topology

This paper presents the design and simulation results of a switched-current (SI) 2-2 MASH Sigma-Delta Modulator (ΣΔM). The modulator is composed by a low-distortion swing suppression topology which is highly suitable for wideband applications. It was realized using fully-differential circuitry with common-mode feedback. The circuit performs 14-bit dynamic range (DR) up to 5 MHz clock frequency and 20 kHz bandwidth. The modulator was designed in 0.6 μm CMOS technology and was sent to the foundry to prototype.