A Low Power Continuous-Time Zoom ADC for Audio Applications

This paper presents a continuous-time (CT) zoom ADC for use in audio applications. Compared to previous zoom ADCs, its input impedance is mainly resistive, making it much easier to drive while still maintaining high energy efficiency. The prototype is fabricated in a 0.16 μm CMOS process, occupies 0.27 mm ² and achieves 108.5 dB DR, 108.1 dB SNR, 106.4 dB SNDR in a 20 kHz BW, while consuming 618 μW. This results in a state-of-the-art Schreier FoM of 183.6 dB.