High-order low-distortion switched-current cascade 2–2–2 ΣΔ modulator

摘要

This paper presents the design and simulation results of a switched-current (SI) MASH 2-2-2 Sigma-Delta Modulator (ΣΔM). The modulator makes use of a low-distortion swing suppression topology which is highly suitable for wideband and high-order modulators. Simulation results reveal that peak signal to noise plus distortion ratio (SNDR) is 83.5 dB at 5 MHz sampling rate with 10 kHz bandwidth. The modulator was designed in a 0.6 μm CMOS technology and the power dissipation is about 45 mW.