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16th International conference on Synthesis, modeling, Analysis and simulation Methods and Applications to Circuit design (SMACD) / 15th conference on PhD Research in microelectronics and Electronics (PRIME)

作者： Tan, Jun Sommer, Ralf IMMS Inst Mikroelekt & Mechatron Syst Gemeinnutzi Ilmenau Germany

ISBN: (纸本)9781728112015

This paper presents a methodology to model and optimize the power supply rejection (PSR) for a low-dropout regulator (LDO) in system-on-chip (SoC) applications. Since SoC designs integrate multiple functions on a single chip, the Power Management Unit (PMU) becomes crucial to meet the requirements for multiple sub-blocks. The supply ripple, which has a significant impact on sensitive analog/RF sub-blocks, needs to be reduced by achieving optimized PSR performance in LDO designs. This paper begins by modeling the conventional LDO topology. The transfer function of the model is calculated, so that the system behaviour can be remapped to the parameters of the sub-blocks. Additionally, the verification is done by comparing the model and a transistor level design. Finally, the methodologies are discussed in two cases, namely a PSR of -50 dB@100 kHz and a full-spectrum PSR of -50 dB. The results show that different design strategies generate practical design trade-offs, although all strategies can theoretically achieve the cases. With the proposed methodologies, the design parameters can be clearly and efficiently optimized to achieve optimum PSR performance.

关键词： System-on-chip

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Analysis, Optimization, and modeling of Analog Multi-Tone Serial Data Transceivers 13

Analysis, Optimization, and Modeling of Analog Multi-Tone Se...

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13th conference on Ph.D. Research in microelectronics and Electronics (PRIME) / 14th International conference on Synthesis, modeling, Analysis and simulation Methods and Application to Circuit design (SMACD)

作者： Kim, Gain Gharibdoust, Kiarash Leblebici, Yusuf Ecole Polytech Fed Lausanne Dept Elect Engn Lausanne Switzerland Kandou Bus SA Lausanne Switzerland

ISBN: (纸本)9781509065080

This paper presents a versatile and fast time-domain architectural modeling framework for high-speed serial data transceivers (TRX) that can employ various analog modulation schemes. We highlight a modeling of TRXs employing an analog multi-tone signaling, which is not straightforward to model and hard to optimize with conventional serial link modeling tools. A method to limit the computing system's memory usage when simulating a data transmission of a long bit-stream, e.g., greater than 10 Mbits, is also described. The reliability of the modeling framework is proven by some comparisons with a highly-trusted commercial tool for a conventional TRX architecture.

关键词： Mixers Integrated circuit modeling Computational modeling Time-domain analysis Jitter Modulation Tools

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Tuning of Moving Window Least Squares-based Algorithm for Online Battery Parameter Estimation 14

Tuning of Moving Window Least Squares-based Algorithm for On...

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作者： Morello, R. Di Rienzo, R. Roncella, R. Saletti, R. Baronti, F. Univ Pisa Dip Ingn Informaz Pisa Italy

ISBN: (纸本)9781509050529

Online battery parameter identification algorithms, such as the Moving Window Least Squares, allow model-based state estimators with low computational intensity to be very accurate. This paper presents a procedure for tuning the algorithm parameters by using application-specific current profiles. A gardening application is taken as a case study. The results prove the validity of the proposed procedure and allow us to assess the identification algorithm performance.

关键词： Batteries State of charge Integrated circuit modeling Electronic countermeasures Mathematical model Tuning

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Robust analog/RF circuit design with projection-based performance modeling

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IEEE TRANSACTIONS ON COMPUTER-AIDED design OF INTEGRATED CIRCUITS AND SYSTEMS 2007年第1期26卷 2-15页

作者： Li, Xin Gopalakrishnan, Padmini Xu, Yang Pileggi, Lawrence T. Carnegie Mellon Univ Dept Elect & Comp Engn Pittsburgh PA 15213 USA

In this paper, a robust analog design (ROAD) tool for posttuning (i.e., locally optimizing) analog/RF circuits is proposed. Starting from an initial design derived from hand analysis or analog circuit optimization based on simplified models, ROAD extracts accurate performance models via transistor-level simulation and iteratively improves the circuit performance by a sequence of geometric programming steps. Importantly, ROAD sets up all design constraints to include large-scale process and environmental variations, thereby facilitating the tradeoff between yield and performance. A crucial component of ROAD is a novel projection-based scheme for quadratic (both polynomial and posynomial) performance modeling, which allows our approach to scale well to large problem sizes. A key feature of this projection-based scheme is a new implicit power iteration algorithm to find the optimal projection space and extract the unknown model coefficients with robust convergence. The efficacy of ROAD is demonstrated on several circuit examples.

关键词： analog/RF circuit circuit optimization performance model robust design

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modeling of Parasitic Light Sensitivity in Global Shutter CMOS Image Sensors 16

Modeling of Parasitic Light Sensitivity in Global Shutter CM...

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作者： Pace, Federico Marcelot, Olivier Martin-Gonthier, Philippe Saint-Pe, Olivier de Boisanger, Michel Breart Sauvage, Rose-Marie Magnan, Pierre Univ Toulouse ISAE SUPAERO 10 Ave Edouard Belin F-31055 Toulouse France Airbus Def & Space 31 Rue Cosmonautes F-31400 Toulouse France Direct Gen Armement 60 Blvd Gen Martial Valin F-75509 Paris France

ISBN: (纸本)9781728112015

This paper aims to model Parasitic Light Sensitivity (PLS) in Global Shutter CMOS Image Sensors (GS-CIS) through separation of the optical problem from the carriers motion one, reducing required simulation time. The optical problem is solved thanks to Finite-Differences Time-Domain (FDTD) simulations. Solution to the carriers motion problem is shown in two ways: through use of Boltzmann Transport Equation (BTE) and through a straight line type of motion. The results show good reproduction of experimental data behavior, though fitting has still to be improved.

关键词： CIS GS FDTD BTE PLS Shutter Efficiency

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A SThM probe optimization and its time-space multi-scale modeling

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MECHATRONICS 2016年 40卷 251-263页

作者： Lenczner, Michel Yang, Bin Bontempi, Alexia Teyssieux, Damien Cogan, Scott Janus, Pawel Koehler, Bernd Ratier, Nicolas Univ Bourgogne Franche Comte Inst FEMTO ST TF 26 Chemin Epitaphe F-25030 Besancon France Univ Bourgogne Franche Comte Inst FEMTO ST MN2S 15 B Ave Montboucons F-25030 Besancon France Univ Bourgogne Franche Comte Inst FEMTO ST DMA 26 Chemin Epitaphe F-25030 Besancon France Inst Technol Elektronowej Al Lotnikow 32-46 PL-02669 Warsaw Poland Fraunhofer IKTS Maria Reiche Str 2 D-01109 Dresden Germany Zhengzhou Univ Light Ind 5 Dongfeng Rd Zhengzhou 450002 Henan Province Peoples R China

We present two aspects of modeling and design of a Scanning Thermal Microscopy (SThM) probe built by microfabrication techniques. An optimized design based on a full parametrization of its geometry is calculated using a multi-criteria optimization technique after a drastic selection of the most sensitive geometrical parameters. The optimization is carried out in the static regime. We also report a new time space multi-scale model of the probe operating in active mode and heated with a combination of DC and modulated harmonic current sources, a case where the simulation takes too long to be used in a regular design process. The model derivation is based on an asymptotic methods related to high frequency periodic source. Precisely, the model distinguishes between two time scales and two space scales related to the low and high frequency phenomena. simulation results show the potential of the model in terms of accuracy and computation speed and are compared to experimental results. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Scanning Thermal Microscopy Probe shape optimization Multi-scale modeling

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Analysis and modeling of a Novel SDR-based High-Precision Positioning System 15

Analysis and Modeling of a Novel SDR-based High-Precision Po...

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15th International conference on Synthesis, modeling, Analysis and simulation Methods and Applications to Circuit design (SMACD) / 14th conference on PhD Research in microelectronics and Electronics (PRIME)

作者： Piccinni, Giovanni Avitabile, Gianfranco Coviello, Giuseppe Talarico, Claudio Polytech Bari Dept Elect & Informat Engn Bari Italy Gonzaga Univ Dept Elect & Comp Engn Spokane WA 99258 USA

ISBN: (纸本)9781538651537

This paper presents a novel Software Defined Radio (SDR) architecture for the design of a high-precision positioning system to be used in medical applications. The proposed architecture is composed of a single mobile transmitter and four fixed receivers using a non-coherent demodulation scheme. The transmitted signal consists of a 100 MHZ 64-length OFDM symbol representing the coefficients of a Frank-Zadoff-Chu (FCZ) sequence. The proposed design has been validated in presence of severe multipath interferences. The accuracy achieved in evaluating the position of the target is always within 1.2 cm with a mean error of 6 mm and a standard deviation of 2.2 mm.

关键词： Software Defined Radio (SDR) Orthogonal Frequency-Division Multiplexing (OFDM) Positioning Systems Frank-Zadoff-Chu (FCZ) sequence

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Thermal aging modeling of Molding Compound under High-Temperature Storage and Temperature Cycling Conditions 19

Thermal aging modeling of Molding Compound under High-Temper...

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19th International conference on Thermal, Mechanical and Multi-Physics simulation and Experiments in microelectronics and Microsystems (EuroSimE)

作者： Zhang, Bingbing Johlitz, Michael Lion, Alexander Ernst, L. J. Jansen, K. M. B. Vu, Duc-Khoi Weiss, Laurens Univ Bundeswehr Munchen Inst Mech Neubiberg Germany Ernst Consultant Schoonhoven Netherlands Guilin Univ Elect Technol Guilin Peoples R China Delft Univ Technol Dept Design Engn Delft Netherlands Infineon Technol AG Munich Germany

ISBN: (纸本)9781538623596

In microelectronic packages, generally the chip is encapsulated by a molding compound (MC). The MC provides a mechanical support for the chip and isolates it from the environment and as a result protects the encapsulated chip. It is well known that MC's are polymer-based materials. When packages are exposed to a harsh environment such as to high-temperature storage or to thermal cycling, the mechanical properties of the MC's can change significantly. Consequently this could result into reliability issues of these packages. For a long time, there was no simple and efficient model method available to simulate the mechanical behavior of these packages under thermal aging conditions. As a result, it was hard to forecast the package reliability after a period of thermal aging. Since in our previous work [1,2] the thermomechanical properties of MC's before and after thermal aging were systematically characterized, the above problem was merely solved. A simple and efficient modeling method was proposed to simulate the thermal aging effects on MC's [2]. In this paper, a bi-material sample consisting of a MC layer on a Copper substrate is prepared and used to verify the proposed modeling method at two different thermal conditions: High-temperature storage (HTS) and Temperature cycling (TC). Based on the proposed modeling method the mechanical behavior of the bi-material sample after aging under these (different) thermal conditions are established throug FEM simulation. The simulation results match the experiment results quite well.

关键词： Aging High-temperature superconductors Temperature measurement microelectronics Ovens Electronic packaging thermal management Compounds

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A Sparsity-Aware MOR Methodology for Fast and Accurate Timing Analysis of VLSI Interconnects 16

A Sparsity-Aware MOR Methodology for Fast and Accurate Timin...

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作者： Garyfallou, Dimitrios Antoniadis, Charalampos Evmorfopoulos, Nestor Stamoulis, Georgios Univ Thessaly Dept Elect & Comp Engn Volos Greece

ISBN: (纸本)9781728112015

Signoff timing analysis is essential in order to verify the proper operation of VLSI circuits. As process technologies scale down towards nanometer regimes, the fast and accurate timing analysis of interconnects has become crucial, since interconnect delay represents an increasingly dominant portion of the overall circuit delay. It is a common view that traditional SPICE transient simulation of very large interconnect models is not feasible for full-chip timing analysis, while static Elmore-based methods can be inaccurate by orders of magnitude. Model Order Reduction (MOR) techniques are typically employed to provide a good compromise between accuracy and performance. However, all established MOR techniques result in dense system matrices that render their simulation impractical. To this end, in this paper we propose a sparsity-aware MOR methodology for the timing analysis of complex interconnects. Experimental results demonstrate that the proposed method achieves up to 30x simulation time speedups over SPICE transient simulation of the initial model, maintaining a reasonable typical accuracy of 4%.

关键词： Circuit simulation MOR Timing Analysis Interconnect

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On the Accurate modeling of Analog Circuits via the Kriging Metamodeling Technique 14

On the Accurate Modeling of Analog Circuits via the Kriging ...

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作者： Garbaya, Amel Kotti, Mouna Fakhfakh, Mourad Tlelo-Cuautle, Esteban Univ Sfax Sfax Tunisia Univ Sousse Sousse Tunisia INAOE Cholula Mexico CINVESTAV Mexico City DF Mexico

ISBN: (纸本)9781509050529

This work deals with the application of the Kriging technique for the accurate modeling of analog circuits, namely, a CMOS second generation current conveyor, and a CMOS voltage follower. Three types of correlation functions are used for this purpose: the Spline, the Gaussian and the Exponential Correlation functions. A comparative study is given. Two metrics are used;Root Mean Square Error and the Maximum Absolute Error. Obtained results show that the Gaussian correlation function provides better results regarding the accuracy of the constructed models, when compared to the other functions.

关键词： Surrogate modeling Kriging Model Spline Correlation Function Gaussian Correlation Function Exponential Correlation Function Analog Circuit design CCII VF RMSE MAE

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