The settling behavior of OTAs in CIFB and FIR-feedback Switched-Capacitor Δ Σ modulators is analyzed, focusing on the trade-offs between power consumption and resolution. A settling error model highlights the impact of slewing nonlinearities, with simulations showing that FIR filters reduce Slew Rate (SR) requirements and lower power consumption, making Gain-Bandwidth (GBW) the primary limiting factor. However, FIR benefits diminish at higher orders and increase design complexity. The study also identifies a promising design space for CIFB modulators with high SR and low GBW, where advanced techniques like Slew Rate Enhancers (SREs) or comparator-based OTAs offer significant power savings despite challenges in achieving high resolution.
Design of Single-Bit Switched-Capacitor ΔΣ Modulators Employing Fast-Settling Techniques
Catania A.;Gagliardi F.;Dei M.
2024-01-01
Abstract
The settling behavior of OTAs in CIFB and FIR-feedback Switched-Capacitor Δ Σ modulators is analyzed, focusing on the trade-offs between power consumption and resolution. A settling error model highlights the impact of slewing nonlinearities, with simulations showing that FIR filters reduce Slew Rate (SR) requirements and lower power consumption, making Gain-Bandwidth (GBW) the primary limiting factor. However, FIR benefits diminish at higher orders and increase design complexity. The study also identifies a promising design space for CIFB modulators with high SR and low GBW, where advanced techniques like Slew Rate Enhancers (SREs) or comparator-based OTAs offer significant power savings despite challenges in achieving high resolution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
