Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1227080
T. Bitoiu, L. Stanciu
Due to many significant advances in computer modeling occurred in the past 30 years, there is now possible to approach many EMC problems in a completely numerical way. EMC problems can be formulated in terms of Partial Differential Equations (PDE) to be solved numerically by means of some discretization techniques such as the Finite Element Method (FEM), the Finite Difference Time Domain Method (FDTD) or they can be formulated in terms of Integral Equations (IE) to be solved numerically by application of the Method of Moments (MOM). In this paper some aspects regarding the possibility to use the FEM to analysis and compute the disturbance field produced by signal and supply traces of a printed circuit board (PCB) are presented.
{"title":"Electromagnetic compatibility analysis of the printed circuits boards using finite element method","authors":"T. Bitoiu, L. Stanciu","doi":"10.1109/SCS.2003.1227080","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227080","url":null,"abstract":"Due to many significant advances in computer modeling occurred in the past 30 years, there is now possible to approach many EMC problems in a completely numerical way. EMC problems can be formulated in terms of Partial Differential Equations (PDE) to be solved numerically by means of some discretization techniques such as the Finite Element Method (FEM), the Finite Difference Time Domain Method (FDTD) or they can be formulated in terms of Integral Equations (IE) to be solved numerically by application of the Method of Moments (MOM). In this paper some aspects regarding the possibility to use the FEM to analysis and compute the disturbance field produced by signal and supply traces of a printed circuit board (PCB) are presented.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132832099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1226957
A. Diordiev, O. Ursaru, M. Lucanu, L. Țigăeru
This paper presents the design of a hybrid PID-fuzzy controller, for a dc/dc converter, which is intrinsically non-linear plant. The PID law is used as a base controller optimized for linear model of the converter, a fuzzy system is used for PID controllers gain control. The proposed hybrid system is evaluated by computer simulation for simple closed-loop dc/dc converters in respect of tracking performance, load regulation, line regulation and integrator component defect compensation of the PID.
{"title":"A hybrid PID-fuzzy controller for dc/dc converters","authors":"A. Diordiev, O. Ursaru, M. Lucanu, L. Țigăeru","doi":"10.1109/SCS.2003.1226957","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226957","url":null,"abstract":"This paper presents the design of a hybrid PID-fuzzy controller, for a dc/dc converter, which is intrinsically non-linear plant. The PID law is used as a base controller optimized for linear model of the converter, a fuzzy system is used for PID controllers gain control. The proposed hybrid system is evaluated by computer simulation for simple closed-loop dc/dc converters in respect of tracking performance, load regulation, line regulation and integrator component defect compensation of the PID.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"3 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130277341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1226977
D. Jitca, V. Apopei
A very important issue in formantic Text-to-Speech (TtS) systems refers to formants transitions between various successive sounds in the word context. While the small-scale transitions can be treated as linear transitions, the large ones must be carefully considered in order to model the equivalent natural transition. When glottal excitation is active during such transitions, specific sounds are produced that require explicit treatment. Our approach to modeling large-scale formant transitions in Klatt-type synthesizers refers to dividing the large transition period into segments of reduced slope (relative steady state) and large slope (transitions between steady states). The short constant frequency segments are created by inserting the corresponding allophones, described by the respective formantic set. The modeling process is exemplified by the case of semivowel i. As a starting point for the synthesis, we analyze words containing semivowel i as part of diphthongs preceded by unvoiced or voiced palatal consonants. The speech synthesis of the analyzed words is depicted in terms of Klatt synthesis parameters.
{"title":"Conclusions on analysis and synthesis of large semivocalic formantic transitions","authors":"D. Jitca, V. Apopei","doi":"10.1109/SCS.2003.1226977","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226977","url":null,"abstract":"A very important issue in formantic Text-to-Speech (TtS) systems refers to formants transitions between various successive sounds in the word context. While the small-scale transitions can be treated as linear transitions, the large ones must be carefully considered in order to model the equivalent natural transition. When glottal excitation is active during such transitions, specific sounds are produced that require explicit treatment. Our approach to modeling large-scale formant transitions in Klatt-type synthesizers refers to dividing the large transition period into segments of reduced slope (relative steady state) and large slope (transitions between steady states). The short constant frequency segments are created by inserting the corresponding allophones, described by the respective formantic set. The modeling process is exemplified by the case of semivowel i. As a starting point for the synthesis, we analyze words containing semivowel i as part of diphthongs preceded by unvoiced or voiced palatal consonants. The speech synthesis of the analyzed words is depicted in terms of Klatt synthesis parameters.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131351270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1227117
R. Nagaria, A. Goswami, P. Venkateswaran, S. Sanyal, R. Nandi
We present some new active-RC integrator and differentiator circuit schemes using the Current Feedback Amplifier (CFA) device. A multiplier element (ICL 8013) has been appropriately utilized in feedback/feedforward connection, to obtain electronic tuning of the circuit time constant (τo) by the d.c. control voltage (Vc) of the multiplier. Satisfactory test results on wave processing had been verified by with hardware implementation in the frequency range of 10 KHz ∼ 200 KHz, and also by PSPICE macromodel simulation.
{"title":"Voltage controlled integrators/differentiators using current feedback amplifier","authors":"R. Nagaria, A. Goswami, P. Venkateswaran, S. Sanyal, R. Nandi","doi":"10.1109/SCS.2003.1227117","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227117","url":null,"abstract":"We present some new active-RC integrator and differentiator circuit schemes using the Current Feedback Amplifier (CFA) device. A multiplier element (ICL 8013) has been appropriately utilized in feedback/feedforward connection, to obtain electronic tuning of the circuit time constant (τo) by the d.c. control voltage (Vc) of the multiplier. Satisfactory test results on wave processing had been verified by with hardware implementation in the frequency range of 10 KHz ∼ 200 KHz, and also by PSPICE macromodel simulation.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114404687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1226986
M. Lucanu, O. Ursaru, C. Aghion
This paper describes the single phase ac chopper realized with IGBT's with high carrier wave frequency (chopper frequency). The rms value of the load voltage and the power control characteristics are given. Also the simulation waveforms of the load and input currents for two power circuits are presented.
{"title":"Single phase AC chopper with IGBTs","authors":"M. Lucanu, O. Ursaru, C. Aghion","doi":"10.1109/SCS.2003.1226986","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226986","url":null,"abstract":"This paper describes the single phase ac chopper realized with IGBT's with high carrier wave frequency (chopper frequency). The rms value of the load voltage and the power control characteristics are given. Also the simulation waveforms of the load and input currents for two power circuits are presented.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"18 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133169552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1227113
M. A. Ibrahim, H. Kuntman, O. Cicekoglu
Two voltage-mode second-order filter configurations are presented. The presented configurations employ minimum number of active and passive elements, namely one differential difference current conveyor (DDCC) as active element and two capacitors and two resistors as passive elements. The proposed filters can realize the low-pass, high-pass and band-pass responses. The new configurations offer very high input impedance, which enables easy cascading and enjoy low sensitivities. The natural frequency ωo and the quality factor Q of the filters are orthogonally adjustable. Simulation results, which confirm the validity of the theoretical analysis, are given to the two configurations.
{"title":"New second-order low-pass, high-pass and band-pass filters employing minimum number of active and passive elements","authors":"M. A. Ibrahim, H. Kuntman, O. Cicekoglu","doi":"10.1109/SCS.2003.1227113","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227113","url":null,"abstract":"Two voltage-mode second-order filter configurations are presented. The presented configurations employ minimum number of active and passive elements, namely one differential difference current conveyor (DDCC) as active element and two capacitors and two resistors as passive elements. The proposed filters can realize the low-pass, high-pass and band-pass responses. The new configurations offer very high input impedance, which enables easy cascading and enjoy low sensitivities. The natural frequency ωo and the quality factor Q of the filters are orthogonally adjustable. Simulation results, which confirm the validity of the theoretical analysis, are given to the two configurations.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125790040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1227115
H. Bilge, F. Anday
A method for realizing transfer functions using current differential amplifiers is presented and a circuit that realizes the general nth-order transfer functions is given. The synthesis procedure is based on voltage integrator and summer circuits. The circuit is suitable for integrated circuit (IC) implementation.
{"title":"Realization of NTH-order transfer functions using current differential amplifiers","authors":"H. Bilge, F. Anday","doi":"10.1109/SCS.2003.1227115","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227115","url":null,"abstract":"A method for realizing transfer functions using current differential amplifiers is presented and a circuit that realizes the general nth-order transfer functions is given. The synthesis procedure is based on voltage integrator and summer circuits. The circuit is suitable for integrated circuit (IC) implementation.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123485582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1226965
M. Stork, P. Kašpar
The fractional frequency synthesizer is similar to the divide-by-N phase-locked loop (PLL) (divider in feedback path). However, the output frequency of the voltage-controlled oscillator (VCO) is not restricted to integral multiples of the reference signal only. Rather, it can also be locked to the fractional multiples, with the result of a substantial reduction of the frequency tuning step in the useful bandwidth of the PLL without reduction of its pass band. Consequently, these frequency synthesizers have both high frequency resolution and short settling time, two essential requirements for modern applications, for example, in modern radio sets. The major difficulties are spurious signals generated in fractional divider system. In this paper, the new fractional PLL frequency synthesizer with Σ-Δ modulator is described. A complete fractional PLL was simulated, constructed and measured.
{"title":"Fractional phase-locked loop frequency synthesizer","authors":"M. Stork, P. Kašpar","doi":"10.1109/SCS.2003.1226965","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226965","url":null,"abstract":"The fractional frequency synthesizer is similar to the divide-by-N phase-locked loop (PLL) (divider in feedback path). However, the output frequency of the voltage-controlled oscillator (VCO) is not restricted to integral multiples of the reference signal only. Rather, it can also be locked to the fractional multiples, with the result of a substantial reduction of the frequency tuning step in the useful bandwidth of the PLL without reduction of its pass band. Consequently, these frequency synthesizers have both high frequency resolution and short settling time, two essential requirements for modern applications, for example, in modern radio sets. The major difficulties are spurious signals generated in fractional divider system. In this paper, the new fractional PLL frequency synthesizer with Σ-Δ modulator is described. A complete fractional PLL was simulated, constructed and measured.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125668822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1227077
S. Collonge, G. Zaharia, G. E. Zein
At millimeter waves, the home furniture and object dimensions can be equal or superior to the wavelength. A comparison between propagation measurements conducted within a residential house for two configurations, furnished and empty, reveals a real influence of the furniture in the millimeter-waves propagation.
{"title":"Influence of the furniture on 60 GHz radio propagation in a residential environment","authors":"S. Collonge, G. Zaharia, G. E. Zein","doi":"10.1109/SCS.2003.1227077","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227077","url":null,"abstract":"At millimeter waves, the home furniture and object dimensions can be equal or superior to the wavelength. A comparison between propagation measurements conducted within a residential house for two configurations, furnished and empty, reveals a real influence of the furniture in the millimeter-waves propagation.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125978225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1227108
V. Svet, I. Bogdan
The slow frequency hopping (SFH) feature allows a mobile station in a GSM network to change its operation frequency from a time slot to another resulting in 217 hops per second. This technique can be applied on all traffic and signaling channels, except for the broadcast common control channel (BCCH), which must transmit on a fixed frequency in order to make possible correct RXLEV measurements for the neighbor cell mobiles based on Recommendation GSM 05.08. The SFH improves the link quality (mainly for slow moving mobiles) and increases the network capacity according to J. Charles (1998). Both simulation and measurements reveal these beneficial effects.
{"title":"Synthesized frequency hopping in GSM networks: implementation and results","authors":"V. Svet, I. Bogdan","doi":"10.1109/SCS.2003.1227108","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227108","url":null,"abstract":"The slow frequency hopping (SFH) feature allows a mobile station in a GSM network to change its operation frequency from a time slot to another resulting in 217 hops per second. This technique can be applied on all traffic and signaling channels, except for the broadcast common control channel (BCCH), which must transmit on a fixed frequency in order to make possible correct RXLEV measurements for the neighbor cell mobiles based on Recommendation GSM 05.08. The SFH improves the link quality (mainly for slow moving mobiles) and increases the network capacity according to J. Charles (1998). Both simulation and measurements reveal these beneficial effects.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129070758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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