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Showing papers by "Blaise Ravelo published in 2017"


Journal ArticleDOI
TL;DR: In this paper, a tensorial analysis of network (TAN) is applied to the asymmetrical 1:3 Y-Y-tree interconnects for signal integrity analysis.
Abstract: The signal distribution interconnect network modeling plays an important role during the digital/mixed printed circuit board (PCB) design. With the increase of the design complexity, the PCB interconnect modeling becomes a challenging task. This paper proposes an innovative circuit theory of the PCB electrical interconnects modeling based on the tensorial analysis of network (TAN). The model under study, fundamentally built with the Kron–Branin formalism, is applied to the asymmetrical 1:3 Y-Y-tree interconnects. This Kron–Branin method enables to establish quickly the tree interconnects equivalent model for the signal integrity (SI) analysis. An asymmetrical microstrip circuit was designed and fabricated to validate the developed TAN concept. The modeled, simulated, and measured S-parameters are in good agreement in the broad frequency band 0.1 MHz to 8 GHz. The electrical power budget distributed through the Y-Y-tree prototype in dc and in the considered entire frequency band was analyzed. Furthermore, the Kron–Branin model was also validated in the time domain with 1-Gb/s-rate 8-bits serial data and eye diagram analyses. This innovative formalism presents a considerably high computation speed and is beneficial for the SI analyses thanks to its adaptability to the complex system.

40 citations


Journal ArticleDOI
TL;DR: This brief describes a synthesis of high-pass negative group delay (NGD) network impedance based on the circuit impedance equivalent principle, and a good agreement between the theoretical prediction and experimental results shows high- pass NGD response from 1 MHz with minimal level of about −10 ns.
Abstract: This brief describes a synthesis of high-pass negative group delay (NGD) network impedance. The fundamental expression of the high-pass NGD canonical transfer function is established. Based on the circuit impedance equivalent principle, the high-pass NGD first-order network that is constituted by RC lumped elements is identified. The identified topology basic NGD characteristics are formulated and analyzed. Then, the associated synthesis method in function of the desired NGD optimal level and cutoff frequency is established. The theory is validated by design, simulations, and measurements of proof-of-concept prototypes. A good agreement between the theoretical prediction and experimental results showing high-pass NGD response from 1 MHz with minimal level of about −10 ns is observed. The high-pass NGD function operates at high frequencies with first-order circuit.

16 citations


Journal ArticleDOI
TL;DR: Thanks to the cost effectiveness and clinical acceptability of wireless telecommunication technology, patient diagnosis and treatment have been significantly improved and technology for remote sensing of patients' activity is also being developed.
Abstract: Wireless technologies are currently among the most prominent candidates for use by the medical and care-giving community as a part of the development of telemedicine systems [1]?[9]. The exponential progress of these technologies is expected to open a multitude of opportunities and choices for enhanced patient safety, better data collection, increased convenience for patients, and reduced costs for health systems [5]?[8]. Thanks to the cost effectiveness and clinical acceptability of wireless telecommunication technology, patient diagnosis and treatment have been significantly improved. Technology for remote sensing of patients' activity is also being developed.

13 citations


Journal ArticleDOI
TL;DR: The developed CPL model is useful for the TZ and RZ frequency shifts fast monitoring during the Radio Frequency (RF)/microwave circuit design phase and was validated with different cases of simulated microstrip proof of concept.
Abstract: Summary This paper treats an innovative methodology on the synthesis mechanism of the coupled-parallel-line (CPL) transmission zero (TZ) and reflection zero (RZ). The CPL structure under study is configured as a reflection type distributed arbitrarily loaded stub circuits. On the basis of the equivalent Z-matrix analysis, the CPL input impedance theoretical model is established. Mathematical analysis is performed to predict accurately the TZ and RZ frequency shifts in function of the CPL physical parameters. The input impedance behavioral model in function of asymmetrical CPL load parameters is determined. The TZ and RZ existence conditions are established. Then, the characteristic equations illustrating the TZ and RZ fundamental formulas in function of the CPL coupling coefficient and characteristic impedances are examined. Furthermore, innovative graphical representations of the TZ and RZ existence conditions in function of the CPL parameter ranges are explored. The developed CPL model was validated with different cases of simulated microstrip proof of concept. As expected, a good correlation between the TZ and RZ frequency shifts from the analytical calculations and simulations is obtained. The developed CPL model is useful for the TZ and RZ frequency shifts fast monitoring during the Radio Frequency (RF)/microwave circuit design phase. Copyright © 2017 John Wiley & Sons, Ltd.

9 citations


Proceedings ArticleDOI
01 Jul 2017
TL;DR: In this paper, an unconventional circuit modelling for 3D multilayer printed circuit board (PCB) is developed using the tensorial analysis of network (TAN) approach.
Abstract: An unconventional circuit modelling for 3D multilayer printed circuit board (PCB) is developed. The modelling methodology uses the tensorial analysis of network (TAN) approach. The multilayer PCB TAN model is based on the modified Kron's formalism. This unfamiliar circuit modelling is first time applied to the multilayer PCB interconnect modelling. After the diakoptics analysis of the proof of concept structure, the equivalent graph topology is established. By analogy, the posed problem to be solved can be formulated by the consideration of four-layer PCB structure. The solution is implemented in Python programming of the proposed model mathematical abstraction. The proposed unconventional TAN model is validated by comparison with a 3D EM commercial tool with very wideband S-parameter computation from DC-to-5GHz.

6 citations


Proceedings ArticleDOI
01 Sep 2017
TL;DR: In this paper, an efficient and unconventional modeling approach for the investigation of power delivery network (PDN) constituted by a multilayer printed circuit board (PCB) structure is established for the power integrity (PI) analysis through a PDN structure with power/ground planes, vias and decoupling capacitors.
Abstract: An efficient and unconventional modelling approach is established for the investigation of power delivery network (PDN) constituted by a multilayer printed circuit board (PCB) structure. The proposed model is applied to the power integrity (PI) analysis through a PDN structure with power/ground planes, vias and decoupling capacitors. The modelling methodology is based on the tensorial analysis of network (TAN) by using the modified Kron's method (MKM). The model computational algorithm is implemented as a Python program. First, the frequency dependent input impedance of the proposed multilayer PDN computed from the MKM is compared with 3D electromagnetic full wave simulations from DC to 2-GHz. Then, the instantaneous and spectrum of the distributed powers through the PDN are compared by considering a switched unit step input feeding voltage. As expected, a good prediction of the input impedance and power distribution is obtained. The proposed MKM numerical computation is beneficial compared to the 3D full wave simulation in terms of processing time and memory.

5 citations


Journal ArticleDOI
TL;DR: In this paper, a behavioural modeling of the planar electric-near-field (E-NF) emission from electronic printed circuit boards is presented, which can be potentially used to lower the cost of EM compatibility engineering during the electronic PCB design phase.
Abstract: This study deals with the behavioural modelling of the planar electric- (E-) near-field (NF) emission from electronic printed circuit boards. The methodology indicating how to synthesise the model from the given scanned E-NF maps in the observation plane of interest is established. The modelled radiation source is built with exclusively E-dipole array whose components are determined by the inverse method. After computational routine algorithm Matlab implementation, the proposed model was validated with various demonstrators. Relevant verifications were performed at different operating frequencies with the E-NF emission from analytical radiation, measurement scanning with active complex RF PCB and full wave simulation with microwave passive microstrip structure. It was shown that the model enables to reproduce the equivalent source with relative error vector magnitude accuracy less than 3%. The error analyses in function of the distance between the observation plane and the radiating PCB were proposed. Moreover, the non-unicity and limit of the model with the E-field emission prediction from different E-field radiated data defined in the scanning observation surface plane positions from the radiating circuit. The developed model can be potentially used to lower the cost of EM compatibility engineering during the electronic PCB design phase.

3 citations


Proceedings ArticleDOI
01 Aug 2017
TL;DR: The KB model efficiency is validated with the static and dynamic powers distributed through the multilayer structure by considering 20 ns duration and 0.5 ns rise/fall time a pulse signal, and the computed energy-per-bit and average powers are compared with simulations from a commercial 3D EM computational tool.
Abstract: With the increase of the operation speed and the miniaturization, the power consumption assessment of multilayer printed circuit board (PCB) becomes a crucial task during the design phase. More accurate power integrity (PI) analysis is necessary for the complex multilayer PCB. An unfamiliar modelling of static and dynamic power distributed through a four-layer interconnect structure is introduced in this paper. The modelling concept is based on the Kron-Branin (KB) formalism. The different steps of the proposed KB modelling are described with the consideration of the RLC equivalent model and its equivalent graph topology. The KB model efficiency is validated with the static and dynamic powers distributed through the multilayer structure by considering 20 ns duration and 0.5 ns rise/fall time a pulse signal. The computed energy-per-bit and average powers are compared with simulations from a commercial 3D EM computational tool.

2 citations


01 Aug 2017
TL;DR: In this article, an innovative Y-shape power divider (PWD) model based on the Kron-Branin formalism is established for single-input two-output (1:2) unequal Y-PWD.
Abstract: An innovative Y-shape power divider (PWD) model is established based on the Kron-Branin formalism The equivalent topology of Y-PWD is elaborated by considering the constituting elements of classical transmission line (TL) The S-parameter theoretical model is applied to single-input two-output (1:2) unequal Y-PWD The unequal level of the outputs is controlled with output quarter wavelength branch characteristic impedances The modelling concept feasibility is validated with a microstrip Y-PWD operating at about 245 GHz The calculated and simulated S-parameters are in good agreement

2 citations


Journal ArticleDOI
TL;DR: An atom probe setup with pulsed evaporation achieved by simultaneous application of both methods is proposed, providing a simple way to improve mass resolution without degrading the intrinsic spatial resolution of the instrument.
Abstract: Atom probe has been developed for investigating materials at the atomic scale and in three dimensions by using either high-voltage (HV) pulses or laser pulses to trigger the field evaporation of surface atoms. In this paper, we propose an atom probe setup with pulsed evaporation achieved by simultaneous application of both methods. This provides a simple way to improve mass resolution without degrading the intrinsic spatial resolution of the instrument. The basic principle of this setup is the combination of both modes, but with a precise control of the delay (at a femtosecond timescale) between voltage and laser pulses. A home-made voltage pulse generator and an air-to-vacuum transmission system are discussed. The shape of the HV pulse presented at the sample apex is experimentally measured. Optimizing the delay between the voltage and the laser pulse improves the mass spectrum quality.

2 citations


Proceedings ArticleDOI
01 Sep 2017
TL;DR: In this article, an RF electromagnetic (EM) characterization of high pulsed voltage electrode is investigated, which acts as an electric or E-field pulse generator for APT application.
Abstract: An RF electromagnetic (EM) characterization of high pulsed voltage electrode is investigated in the present paper. The electrode acts as an electric-or E-field pulse generator for atom probe tomography (APT) application. The proposed electrode device is essentially comprised of a microstrip transmission line (TL) combined with via hole. The challenging prediction of the electrode signal integrity and E-field emission is elaborated. The APT pulse generator equivalent model is established. The transient response of the voltage pulse generator EM into transient electric pulse is analyzed. The excitation signal is assumed as a square wave pulse voltage with 1-kV amplitude and 2-ns full width time duration. The electrode device S-parameter responses from DC to 8-GHz is computed. The behavior of the transient E-field response in function of the position inside the substrate via hole is analysed. The delivered harmonic input current and power optimal values are assessed.

01 Aug 2017
TL;DR: In this paper, the atom probe (AP) signal generator was designed with 50-Ω loaded microstrip line centered by via hole and the worst cases of the signal integrity was performed with MC analysis applied to the electrode transmission line metallization width sensitivity.
Abstract: The electrode constitutes the key element of the atom probe (AP) pulse signal generator. The AP parameter Monte Carlo (MC) analysis is introduced. The AP microelectrode is designed with 50-Ω loaded microstrip line centered by via hole. The excitation square wave pulse presents 300-ps duration and 1-kV amplitude. The worst cases of the signal integrity is performed with MC analysis applied to the electrode transmission line metallization width sensitivity. Computation results with commercial frequency analysis from DC to 10-GHz is presented. The worst-case analysis is necessary for the AP performance optimization by increasing the radiated pulsed electric-field.