This paper presents a dynamic zoom analog-todigital converter for use in low-bandwidth (<1 kHz) instrumentation applications. It employs a high-speed asynchronous successive approximation register (SAR) ADC that dynamically updates the references of a fully differential ADC. Compared to previous zoom ADCs, faster reference updates relax the loop filter requirements, thus allowing the adoption of energy-efficient amplifiers. Fabricated in a 0.16-μm CMOS process, the prototype occupies 0.26 mm 2

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... nd achieves 119.1-dB peak signal-to-noise ratio (SNR), 118.1-dB peak signal-to-noise-and-distortion-ratio (SNDR), and 120.3-dB dynamic range (DR) in a 1-kHz bandwidth while consuming 280 μW. This results in a Schreier figure of merit (FoM) of 185.8 dB. Index Terms-A/D conversion, asynchronous successive approximation register analog-to-digital converter, batterypowered applications, delta-sigma ADC, dynamic zoom ADC , inverter-based operational transconductance amplifier (OTA), low-power circuits. Mr. Gönen was a recipient of the First Prize of the IEEE SSCS Benelux Chapter Student Chip Design Contest in 2017. Fabio Sebastiano (S'09-M'10-SM'17) was born in Teramo, Italy, in 1981. He received the B.Sc. and M.Sc. degrees (cum laude) in electrical engineering from