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arXiv · 2301.03232

Spin-Orbit Torque Flash Analog-to-Digital Converter

Hamdam Ghanatian·Luana Benetti·Pedro Anacleto·Tim Bohnert·Hooman Farkhani·Ricardo Ferreira·Farshad Moradi
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Abstract

Although Analog-to-digital converters (ADCs) are critical components in mixed-signal integrated circuits (IC), their performance has not been improved significantly over the last decade. To achieve a radical improvement (compact, low power and reliable ADCs), spintronics can be considered as a proper candidate due to its compatibility with CMOS and wide applications in storage, neuromorphic computing, and so on. In this paper, a proof-of-concept of a 3-bit spin-CMOS Flash ADC using in-plane-anisotropy magnetic tunnel junctions (i-MTJs) with spin-orbit torque (SOT) switching mechanism is designed, fabricated and characterized. The proposed ADC replaces the current mirrors and power-hungry comparators in the conventional Flash ADC with seven parallel i-MTJs with different heavy metal (HM) widths. Monte-Carlo simulations based on the experimental measurements show the process variations/mismatch limits the accuracy of the proposed ADC to 2 bits. Moreover, the maximum differential nonlinearity (DNL) and integral nonlinearity (INL) are 0.739 LSB (least significant bit) and 0.7319 LSB, respectively.

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Hamdam Ghanatian, Luana Benetti, Pedro Anacleto, Tim Bohnert, Hooman Farkhani, Ricardo Ferreira, Farshad Moradi. 2023-01-09. Spin-Orbit Torque Flash Analog-to-Digital Converter. https://arxiv.org/abs/2301.03232

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