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Author

Jun Fan

Bio: Jun Fan is an academic researcher from Missouri University of Science and Technology. The author has contributed to research in topics: Equivalent circuit & Printed circuit board. The author has an hindex of 36, co-authored 482 publications receiving 5641 citations. Previous affiliations of Jun Fan include Ulsan National Institute of Science and Technology & University of Missouri.


Papers
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Proceedings ArticleDOI
26 May 2015
TL;DR: In this article, the impact of considering exact or approximated values for the nonlinear depletion capacitance in a TSV equivalent circuit for transient analysis is discussed, and the effects of the time variant and nonlinear behavior of the doped bulk silicon substrate on signal propagation and crosstalk are also studied.
Abstract: This paper looksat the impact of consideringthe exact or approximated values for the nonlinear depletion capacitance in a TSV equivalent circuit for transient analysis. Furthermore, the effects of the time variant and nonlinear behavior of the doped bulk silicon substrate on signal propagation and crosstalk are also studied.

1 citations

Proceedings ArticleDOI
18 Aug 2016
TL;DR: In this article, the authors proposed a periodic-aperiodicity-based topology for printed circuit board (PCB) layout that reuses the unitcell from periodic routing that have same lengths but only vary the spacing between each unitcell to create the aperiodicity.
Abstract: Reducing cost in printed circuit board (PCB) layout has pushed designers to use broadside coupled layers to reduce the layer count. The traces are generally routed at an angle in zig-zag fashion to eliminate fiber-weave impact on the insertion loss (THRU) of the channel. If the zig-zag routing is periodic, then it can increase the crosstalk due to Floquet mode resonances. The Floquet resonances aggravate near-end crosstalk (NEXT) and degrade the insertion loss (THRU) profiles. Creating any random structure will not mitigate the Floquet mode resonance. The aperiodic topology created by making the each unitcell different in length did not mitigate the resonances observed in periodic structure but instead created additional resonances in the frequency range of interest. The other challenge for the layout engineers is to route the aperiodic topology that contains different unit cell blocks with different lengths and angles on a real board. In this paper, the proposed solution relies on "periodic-aperiodicity" to eliminate these resonances. The topology reuses the unitcell from periodic routing that have same lengths but only vary the spacing between each unitcell to create the aperiodicity. The proposed topology is easy to route as layout engineers can reuse the periodic routing and space them with aperiodic uncoupled segments.

1 citations

Proceedings ArticleDOI
22 Jul 2019
TL;DR: Generic models were developed for a differential strip line connecting differential pair of vias and have shown close correlation with that of 3D full wave simulation models with frequency ranges of 10 MHz to 20 GHz.
Abstract: To accelerate the simulation timing for more general structures like a stripline connected between vias, generic models were developed for a differential strip line connecting differential pair of vias. While a less time consuming 2-dimensional (2D) simulations are used for striplines, an analytical approximation has been employed for vias. The models developed have shown close correlation (within+/-1.5 dB) with that of 3D full wave simulation models with frequency ranges of 10 MHz to 20 GHz.

1 citations

Proceedings ArticleDOI
27 May 2014
Abstract: Increase in the cost of printed circuit board (PCB) with the increase in layer count has led to the design of PCB stack-ups that have broadside coupled signals. The coupling that occurs between the single-ended signal trace coupled to a differential signal traces at various angles and at multiple instances creates a imbalance in the differential signal line thereby generating common-mode signal at the victim receiver. The periodic routing of single-ended trace also generate Floquet modes where the near end crosstalk (NEXT) peaks impacting the signal at the victim receiver. In this paper, various design parameters that impact the eye opening such as number of coupled sections (which dictates the periodicity), horizontal spacing of victim and aggressor, and signaling speeds are included. Different styles of routing of single-ended trace are studied to quantify the impact of differential-common mode conversion and NEXT at the receiver using statistical bit error rate (BER) analysis. Guidelines for best routing practices are developed for the designer to maintain signal integrity.

1 citations


Cited by
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Journal ArticleDOI

[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

01 Jan 2016

733 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a wideband ultra wideband (UWB) communication protocol with a low EIRP level (−41.3dBm/MHz) for unlicensed operation between 3.1 and 10.6 GHz.
Abstract: Before the emergence of ultra-wideband (UWB) radios, widely used wireless communications were based on sinusoidal carriers, and impulse technologies were employed only in specific applications (e.g. radar). In 2002, the Federal Communication Commission (FCC) allowed unlicensed operation between 3.1–10.6 GHz for UWB communication, using a wideband signal format with a low EIRP level (−41.3dBm/MHz). UWB communication systems then emerged as an alternative to narrowband systems and significant effort in this area has been invested at the regulatory, commercial, and research levels.

452 citations