EMI Issues in Pseudo-Differential Signaling for SDRAM Interface

Jang, Young-Jae; Yi, Il-Min; Kim, Byungsub; Sim, Jae‐Yoon; Park, Hong-June

doi:10.5573/jsts.2015.15.5.455

Cited by 1 publication

(2 citation statements)

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“…15(b), the image wires that are symmetrical to the top wires w.r.t. [19]; it has three components that are proportional to 1/r, 1/r 2 and 1/r 3 , respectively. In this work, H θ is approximated to an empirical equation for simplicity, as follows.…”

Section: Measurement Resultsmentioning

confidence: 99%

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A Single-Ended Parallel Transceiver With Four-Bit Four-Wire Four-Level Balanced Coding for the Point-to-Point DRAM Interface

Lee

Lim

et al. 2016

IEEE J. Solid-State Circuits

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A four-bit four-wire four-level (4B4W4L) singleended parallel transceiver for the point-to-point DRAM interface achieved a peak reduction of ∼10 dB in the electromagnetic interference (EMI) H-field power, compared to a conventional 4-bit parallel binary transceiver with the same output driver power of transmitter (TX) and the same input voltage margin of receiver (RX). A four-level balanced coding is used in this work to minimize the simultaneous switching noise at TX, to utilize a differential sensing without a reference voltage at RX, to maintain the pin efficiency of 100%, and also to reduce EMI by setting the sum of currents through the four wires to be zero. A capacitive pre-emphasis scheme modified for four-level signaling is also used at TX to compensate for inter-symbol interference. The transmitted four-level signals are recovered by six differential comparators with an offset compensation and a decoder at RX. The proposed transceiver chip fabricated in a 65 nm CMOS process consumes 2.39 pJ/bit with a 1.2 V supply and a 2 inch FR4 channel at 8 Gb/s. Index Terms-Balanced coding, DRAM interface, electromagnetic interference (EMI), H-field measurement, parallel links, single-ended, transceiver, 4-bit 4-wire 4-level signaling.

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Section: Measurement Resultsmentioning

confidence: 99%

“…An H-field probe [19] was used for the EMI measurement in this work since E-field measurements were too noisy to determine height dependence. The H-field was measured at different heights from the printed circuit board (PCB) (Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%