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Introduction
Analytical and computational electromagnetic methods with application to multilayered printed circuits of high-speed data communication.
Additional affiliations
January 2007 - April 2016
Publications
Publications (60)
Designing printed circuit board (PCB) based power delivery networks (PDNs) shows increasing challenges for high-speed digital links due to higher complexities of the design process introduced by higher switching frequencies of integrated circuits, higher integration density, and lower supply voltages. Machine learning (ML) tools are increasingly be...
An indefinite impedance matrix technique is proposed for efficient analysis of irregular shaped planar microwave and gigabit rate printed circuit board (PCB) circuits. The proposed method combines segmentation and desegmentation algorithms in a single matrix operation. The segmentation algorithm unites multiple planar blocks to make a composite str...
A method based on the indefinite impedance matrix application to planar circuits is developed for power delivery network (PDN) characterization of high-speed/high-density data communication circuits. By utilizing the parallel plate waveguide concept, the proposed method incorporates both ground and power via effects as well as decoupling capacitors...
A multi-port constrained optimization methodology is presented for the optimal placement of decoupling capacitors in power distribution networks (PDNs) of printed circuit boards (PCBs). The proposed method is based on barrier methods and can simultaneously handle multiple ball grid array (BGA) devices and capacitor ports on practical power/ground p...
A global analysis technique is proposed to calculate the effectiveness of decoupling capacitors on practical power delivery networks (PDN). The proposed method is based on separation of a PDN into its power transmission lines (PTL) and non-PTL sections. The PTL section consists of circuit components with the highest impact on the impedance of the s...
A domain decomposition method is proposed to evaluate the effectiveness of decoupling capacitors in practical power delivery networks (PDNs). The proposed method is based on the separation of a PDN into its local and nonlocal domains. The local domain is constituted by circuit components with the highest impact on the impedance of a specified power...
A novel pin impedance based figure of merit including mutual coupling (PMC-FOM) is proposed for effectiveness assessment of a decoupling capacitor. The algorithm is based on the relative location of the capacitor on parallel plates and takes into account mutual coupling by extending the existing scalar expressions to matrix relations. New analytica...
We Agree with the comments
[1]
that,
$Z_{\mathrm {in}}$
being a complex valued function of real variables
$r$
and
$\phi$
[2, eqs. (15) and (16)]
should be based on the following relation:
A multiobjective evolutionary method is proposed for the optimization of surface mount device (SMD) multilayer ceramic chip (MLCC) capacitors used for decoupling on printed circuit boards (PCB) with resonant power-ground plane pairs. The proposed approach provides options for designers to meet power integrity specifications by employing uniform-val...
A semi-analytical method is proposed to evaluate the effectiveness of a decoupling capacitor on resonant power and ground planes. New expressions are developed relating the pin impedance to relative placement of a capacitor with associated angular and distance parameters. To speed up the solution of resulting transcendental equations, a 2-D iterati...
A genetic algorithm (GA)-based method is proposed for simultaneous optimization of decoupling capacitors assigned to multiple pins of a ball-grid array (BGA) package on a printed circuit board. A noise susceptibility parameter is introduced as the basis of a new set of GA fitness functions. Performance of several fitness functions is comparatively...
With rapidly increasing switching speeds and surge current requirements, placement of local decoupling capacitors is becoming critically important in high-speed low-power designs. In this paper, utilizing the driving-point impedance (viewed from the device pin) as a metric, a new method is presented for the placement of decoupling capacitors in par...
In this paper, a novel approach is presented for an integrated analysis of power distribution networks, including dc-dc converters, power transmission lines (PTLs), and multiple loads. The effect of power interconnects is investigated on the dynamic characteristics of a pulsewidth-modulated buck converter. A closed-form relation is developed for co...
Crossing strip junctions form an important discontinuity problem in differential signaling an pose a major challenge for signal integrity modeling throughout an analysis in high-speed designs. An analytical framework is proposed to characterize differential transmission lines including the effect of crossing strip junctions for broadband circuit an...
The input-to-output transfer function of a buck converter is investigated including power transmission line parameters, accounting for printed circuit board (PCB) parasitics. A closed-form relation is developed for the transfer function to be used in small-signal analysis. Also, the effect of power transmission lines is demonstrated on control-to-o...
In this paper, a new formulation is provided to model the noise coupling between adjacent planes in a multilayer stackup. A model is developed to show that the planar coupling depends heavily on the wave impedance of each power plane. Also a rigorous investigation of planar noise coupling with respect to the separation distance between the planes a...
The design parameters of a buck converter are investigated based on ac small-signal design parameters such as open-loop, input-to-output and control-to-output transfer functions including distributed circuit parameters that account for PCB parasitics. It is demonstrated that the PCB effects neglected in a 2nd order model could affect the design par...
In this paper, the ac small-signal relations of commonly used DC-DC controllers such as buck, boost and buck-boost are extended to include distributed PCB effects. The critical parameters of these controllers including input-to-output, control-to-output transfer functions and the output impedance impacting power and EMC designs are derived. Using t...
Analytical models of high-speed interconnects are becoming increasingly important due to the large number and repetitive nature of signal integrity simulations. In this paper, closed-form relations are developed to calculate the characteristic impedance of differential traces routed on asymmetrical dual stripline layers. The solution is based on Sc...
In this letter, a new method for nonlinear behavioral modeling of high-speed I/O drivers is presented, combining neural networks with driver specific circuit knowledge. In the proposed technique, the circuit knowledge of the driver is exploited to preserve the physical property of the driver. In addition, several neural network sub-models are incor...
This paper provides an overview of a fast modeling approach for modeling the nonlinear IO buffers for signal integrity based simulation and design of high-speed electronic interconnect and packages. Techniques based on artificial neural network (ANN) modeling are developed, where the neural network is trained to learn from IO buffer data, and train...
This paper introduces a new time-domain approach for compact macromodeling of multiport high-speed circuits with long delays, characterized by tabulated data. The algorithm is based on partitioning the data in the time-domain and subsequently, approximating each partition via delayed rational functions. This results in a compact low-order macromode...
This paper introduces a novel algorithm for delay extraction-based passive macromodeling of multiconductor transmission line
type interconnects characterized by multiport (Y, Z, S, or H) tabulated parameters. The algorithm determines a unique logarithm
of the H parameters, which is then approximated using a low-order rational function. Subsequently...
Electromagnetic compatibility (EMC) analysis of high-speed designs has become imperative due to rapidly increasing radio-frequency interference and emerging technological trends such as higher operating frequencies, denser layouts, and multifunction convergent products. In this paper, a simplified macromodel of multiconductor transmission lines (MT...
Artiflcial neural networks (ANN) have gained attention as fast and ∞exible vehicles to microwave modeling and design. This paper reviews a recent advance of neural network modeling, i.e., state-space dynamic neural network (SSDNN) for transient behavioral modeling of high-speed nonlinear circuits. The SSDNN model can be directly trained from the in...
With the continually increasing frequencies and densities of modern VLSI designs, fast and accurate EMC/EMI analysis is becoming mandatory. This paper presents a closed-form SPICE macromodel for fast transient analysis of lossy multiconductor transmission lines with frequency-dependent parameters, in the presence of incident electromagnetic fields....
Due to the rapid surge in operating frequencies and complexity of modern electronic designs, accurate/fast electromagnetic compatibility/interference analysis is becoming mandatory. This paper presents a closed-form SPICE macromodel for fast transient analysis of lossy multiconductor transmission lines in the presence of incident electromagnetic fi...
Due to the rapid surge in operating frequencies and complexity of modern VLSI designs, fast and accurate EMC/EMI analysis is becoming mandatory. This paper presents a closed-form SPICE macromodel for fast transient analysis of lossy multiconductor transmission lines in the presence of incident electromagnetic fields. In the proposed algorithm, the...
This paper presents an efficient algorithm for transient analysis of multiconductor transmission lines (MTL) with frequency-dependent parameters subjected to electromagnetic interference (EMI). A closed-form formulation in terms of split representation of equivalent sources is proposed to account for EMI induced effects. A compact and passive macro...
This work presents a SPICE macromodel for fast transient analysis of lossy multiconductor transmission line (MTL) interconnects in the presence of electromagnetic interference (EMI). A simplified formulation based on split representation at both ends of the MTL structure for computation of equivalent sources in the time-domain is described. A passi...
This paper presents an algorithm for fast transient analysis of multiconductor transmission line interconnects in the presence of incident fields. In the proposed approach: (a) The formulation of equivalent external sources due to incident fields is independent of the type of the macromodel used to represent the MTL system and can be represented an...
Delta-I noise suppression techniques were experimentally investigated on a 16-layer functional board up to 12 GHz. The effect of embedded and high-frequency discrete decoupling capacitors was analyzed both in the frequency and time domains. While noise suppression capabilities of high-frequency discrete decoupling capacitors are restricted to about...
A genetic algorithm-based method is presented to model the interconnect discontinuities in multi-Gb/s systems. In the proposed algorithm, only the s11-parameter of a discontinuity is needed. The data can be obtained either from measurements or 3D-electromagnetic simulations. The measurement/simulation results are processed with genetic algorithm op...
An efficient time-domain macromodel for incident field coupling to
lossy multiconductor transmission lines is presented. The model takes
the form of ordinary differential equations and can be easily included
in SPICE like simulators for transient analysis. The model is based on
the closed-form matrix-rational approximation of the exponential matrix...
A time-domain macromodel for incident field coupling to
multiconductor transmission lines with frequency-dependent losses is
presented. The model, which is based on the closed-form matrix-rational
approximation of the exponential matrix describing telegrapher's
equations, is in the form of ordinary differential equations and can be
easily included...
With continually increasing operating frequencies, the analysis of
electromagnetic interference (EMI)-related effects is becoming an
important issue for high-speed designs. An algorithm is presented for
fast analysis of radiation and incident field coupling effects in
high-speed circuits. The proposed technique provides an efficient means
for combi...
An efficient method is presented for rigorous analysis of
electromagnetic radiation from high-speed interconnects. Based on model
reduction techniques, the proposed algorithm incorporates the finite
difference time domain (FDTD) method with a circuit level simulator such
as SPICE to calculate the near zone radiated emissions from arbitrarily
shaped...
An efficient method is presented for rigorous analysis of incident
field coupling to high speed interconnects. The method is based on
generating time domain equivalent sources from incoming fields through
finite difference time domain analysis (FDTD) and incorporating them
with a circuit level simulator such as SPICE. With this approach, it is
poss...
Simulation of high-speed circuits and interconnects in the
presence of incident electromagnetic interference is becoming an
important step in the design cycle. An accurate and efficient method for
the analysis of incident field coupling to traces in inhomogeneous
medium is described. The method is based on the application of the
physical optics tec...
An accurate and efficient method for the analysis of incident field coupling to traces in inhomogenous media is described. The method is based on the application of physical optics in combination with the boundary matching technique. In addition to accounting for the inhomogeneity of the medium, this method provides significant CPU improvement over...
Thesis (Ph. D.)--Carleton University, 2001. Includes bibliographical references.