A Stub Equalizer for Bidirectional and Single-Ended Channels in NAND Memory Storage Device Systems
In memory devices, such as solid-state drive, multitopology is used for interfaces where multiple memory packages are connected to a controller using a branched transmission line. Impedance mismatching caused by the branches and unwanted reflection from deactivated packages inevitably degrades signal quality, limiting the data rate of the interface. In this article, a simple stub equalizer is proposed to improve the data rate of the memory interface. An open-ended stub is placed between a transmitter and a receiver, and the length, impedance, and location of the stub line are determined to properly cancel the reflection from other branches. Parameters are optimized based on the peak distortion analysis and an exhaustive search considering both read and write modes. The improvements are validated through eye-diagram simulations.
T. Song et al., "A Stub Equalizer for Bidirectional and Single-Ended Channels in NAND Memory Storage Device Systems," IEEE Transactions on Electromagnetic Compatibility, vol. 64, no. 1, pp. 172 - 181, Institute of Electrical and Electronics Engineers (IEEE), Feb 2022.
The definitive version is available at https://doi.org/10.1109/TEMC.2021.3098481
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Equalizer; Peak Distortion Analysis (PDA); Signal Integrity (SI); Solid-State Drive (SSD); Stub Equalizer
International Standard Serial Number (ISSN)
Article - Journal
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01 Feb 2022