A 2.7Gb/s/mm 2 0.9pJ/b/chip 1coil/channel ThruChip interface with coupled-resonator-based CDR for NAND Flash memory stacking

This paper presents an inductive-coupling interface for NAND Flash memory stacking whose bandwidth per unit area is 2.7Gb/s/mm 2 and energy consumption per chip is 0.9pJ/b/chip. The bandwidth is increased by 10× (in other words, layout area is reduced to 1/10 for the same data rate), and the energy consumption is reduced by half, both compared to the latest research results [1]. A relayed transmission scheme using one coil is proposed to reduce the number of coils in a data link. Coupled resonation is utilized for clock and data recovery (CDR) for the first time in the world, resulting in elimination of a source synchronous clock link. As a result, total number of coils needed to form a channel is reduced from 6 to 1, yielding the significant improvement in data rate, layout area and energy consumption.