A Continuous-Time Zoom ADC for Low-Power Audio Applications
B. Gonen (Ethernovia, TU Delft - Electronic Instrumentation)
S. Karmakar (TU Delft - Electronic Instrumentation)
Robert Van Van Veldhoven (NXP Semiconductors)
Kofi A. Makinwa (TU Delft - Microelectronics)
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Abstract
This article presents a continuous-Time zoom analog to digital converter (ADC) for audio applications. It employs a high-speed asynchronous SAR ADC that dynamically updates the references of a continuous-Time delta-sigma modulator (CTDSM). Compared to previous switched-capacitor (SC) zoom ADCs, its input impedance is essentially resistive, which relaxes the power dissipation of its reference and input buffers. Fabricated in a 160-nm CMOS process, the ADC occupies 0.27 mm
2 and achieves 108.1-dB peak SNR, 106.4-dB peak signal to noise and distortion ratio (SNDR), and 108.5-dB dynamic range in a 20-kHz bandwidth while consuming 618 \mu \text{W}. This results in a Schreier figure of merit (FoM) of 183.6 dB.