A 182.9-dB FoM 108.2-dB SFDR Power/Bandwidth Configurable Fully Dynamic Switched-Capacitor Zoom ADC With Interstage Leakage Shaping

This article presents a fully dynamic switched-capacitor zoom ADC with 1st-order interstage leakage shaping (ILS). Noise shaping capability is integrated into the coarse stage by a low-cost error-feedback (EF) path, effectively mitigating quantization noise leakage in the traditional zoom architecture due to the non-unity STF. In addition, a swing-enhanced floating inverter amplifier (FIA) architecture is proposed for improved linearity as well as fully dynamic operations. The prototype ADC is fabricated in a 65-nm CMOS process and occupies an active area of 0.22 mm2. With a 1.2-V supply, it achieves 98.1-dB peak SNDR over a 20-kHz bandwidth with 142.8
$\mu $
W power consumption, resulting in a DR-based Schreier FoM of 182.9 dB and an SNDR-based FoM of 179.5 dB, respectively. According to the measurement results, 8
$\times $
power/BW configurability can be achieved by the zoom ADC while maintaining SNDR above 98 dB.