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

Modeling of Rf Interference Caused by Solid-State Drive Noise

In this paper, modeling of RFI problem caused by a solid-state drive (SSD) in a laptop is proposed. Two noise sources (one outside and one inside a cavity) in the SSD are reconstructed as dipole moments with magnitude-only near-field scanning data. The dipole moment inside a cavity is then replaced by a Huygens\u27 box covering four side surfaces of the cavity using a numerical simulation. The noise voltage at an RF antenna port is calculated by combining the two reconstructed noise sources with measured transfer functions. The model is successfully validated through a comparison of the calculation with measurement results

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

Field Coupling Mechanism Investigation of mm-Wave Magnetic Near-Field Probe based on a Generalized Equivalent Circuit

A field-response-equivalent circuit is advantageous for explaining the field coupling mechanism of H-field probes. Previous works have primarily explained the coupling between a field probe and the calibration kit. In this paper, a field coupling circuit model is proposed in a generalized form to directly predict the voltage induced by the H-field and the unwanted E-field in the probe for the mm-wave range. The field response circuit model is based on the loop impedance model and incident field response of a loop antenna in the form of a series expansion. This paper reveals that the zero-mode response corresponds to H-field coupling, whereas the first mode corresponds to E-field coupling and is validated through the numerical simulation based on the circular loop antenna. The coupling of the fabricated H-field probe is predicted based on the equivalent circuit model and the prediction matches numerical simulation and measurement results from 1 GHz to 40 GHz. The equivalent circuit can be used to predict the probe field coupling with an error of less than 4 dB. Finally, this paper provides a generalized equivalent circuit as a tool to analyze and understand the probe field coupling quantitively. This paper reuses some content from thesis in sections I, II and III with permission