Year: 2024
Type: conference-paper
Abstract: This article presents a cryogenic 8-bit successive approximation register (SAR) analog-to-digital converter (ADC) using Nexchip 110 nm 1P6M CMOS technology for the readout of qubits. To mitigate the base freeze-out effect of bipolar junction transistors at cryogenic temperature and the resulting unavailable BJT-based bandgap voltage reference circuits, a VCM -based switching procedure through a capacitive DAC with top-plate sampling split capacitor array was employed. By the adoption of compact cryo-CMOS SPICE model and asynchronous control logic, the ADC achieves an SNDR of 41.56 dB and consumes 2.1 mW while maintaining the Walden FoM of 646 fJ/conv.-step at 4.2 K and 32 MS/s. The converter occupies an active area of 0.106 mm2.
Authors: Yajie Huang, Changchun Zhou, Guoping Guo, Chao Luo
Institution: University of Science and Technology of China
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4408854469