Author
Jun Fan
Other affiliations: Ulsan National Institute of Science and Technology, University of Missouri, NCR Corporation ...read more
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 published on a yearly basis
Papers
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TL;DR: In this paper, a hybrid approach is proposed to signal integrity analysis of trace and vias in plate pair with an infinitely large dimension by using the domain decomposition method, trace domain and via domain are divided from the plate domain.
Abstract: A hybrid approach is proposed to signal integrity analysis of trace and vias in plate pair with an infinitely large dimension. By using the domain decomposition method, trace domain and via domain are divided from the plate domain. Each individual domain of via and trace structure is modeled by the 3-D full-wave tool HFSS as a multimode network composed of TEM mode waveguide ports at top/bottom antipad interfaces and vertical lumped ports on the segmentation interfaces. The plate domain is dominated by TMZ0 modes and network parameters are solved by boundary integral method. Connection of network of each domain enforces the field continuity conditions along the segmentation interfaces and yields the final S parameter of trace and via as well as trace/via to trace/via coupling. Once the via pattern and trace routing are determined, the coupling can be efficiently modeled by the proposed hybrid approach and the layouts of via structures and trace routing in a plate pair are efficiently optimized.
2 citations
TL;DR: In this paper, a model of ground bounce induced by a high-speed output buffer with on-chip low-dropout (LDO) regulator was proposed, based on the self-impedance of the off-chip ground network and switching current spectra.
Abstract: This study proposes a model of ground bounce induced by a high-speed output buffer with on-chip low-dropout (LDO) regulator. When the output buffer operates with a high-speed clock, high output impedance of the pass transistor and low impedance of the on-chip decoupling capacitor at load enable the ground bounce calculation by only using the self-impedance of the off-chip ground network and switching current spectra. The accuracy of the proposed model is indirectly validated by measurement. Simulated ground bounce by using the proposed model shows very good correlation with the experimentally validated SPICE model.
2 citations
07 Nov 2002
TL;DR: In this article, reference capacitors are recommended as a solution to mitigate the effect of the displacement current path from the power layer to ground in a multi-layer printed circuit board.
Abstract: In a high-speed multi-layer PCB (printed circuit board) design with multiple power layers, signal trace placement can be an important issue. Studies on a multi-layer test board are reported in this work. Single-ended high-speed signals that use the power layers as reference (return) may suffer extra loss in some frequency ranges due to the displacement current path from the power layer to ground. "Reference" capacitors are recommended as a solution to mitigate this effect. Differential traces do not suffer this extra loss. However, transmission loss and mode conversion of a differential trace may be affected by its layer position. The traces immediately adjacent to the ground layer showed the best performance in this particular test board.
2 citations
20 Nov 2014
TL;DR: In this paper, a domain decomposition approach, namely hybrid boundaryintegral and finite-element method, is proposed for signal integrity analysis of an infinitely large plate pair with multi-vias in a shared anti-pad.
Abstract: A domain decomposition approach, namely hybrid boundary-integral and finite-element method, is proposed for signal integrity analysis of an infinitely-large plate pair with multi-vias in a shared anti-pad. Each via structure is modeled as a multi-mode network containing top/bottom transverse electromagnetic (TEM) ports associated with vias and parallel-plate ports a little far away from the anti-pad. Coupling among parallel-plate ports of all via structures is considered by a plate-pair impedance matrix. The connection of the multi-mode networks of via structures and the impedance matrix constructs a complete noise coupling path from one via structure to another one, and the S-parameter of the entire plate pair can be steadily obtained by simply manipulating S-parameter matrices. Numerical examples are used to verify the accuracy of the approach by comparing with a full-wave solver.
2 citations
TL;DR: In this paper, the authors investigated the load characteristics of a WPT system with different resonant types and resonator numbers, and they found that the load characteristic is determined by the number of inductors.
Abstract: Wireless Power Transfer (WPT) has been the research focus and applied in many fields. Normally power is transferred wirelessly to charge the battery, which requires specific load characteristics. The load characteristics are essential for the design and operation of the WPT system. This paper investigates the load characteristics of the WPT system with different resonant types and resonator numbers. It is found that in a WPT system with series or LCL resonance under a constant voltage source, the load characteristic is determined by the number of inductors. Even number of inductors results in a constant current characteristic and odd number constant voltage characteristic. Calculations, simulations, and experiments verify the analysis.
2 citations
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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
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