Pub Date : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371423
M. Drutarovský, P. Galajda
This paper presents a new chaos-based True Random Number Generator (TRNG) with decreased voltage supply sensitivity. Contrary to the traditionally used sources of randomness it uses well-defined deterministic switched-capacitor circuit that exhibits chaos. The whole design is embedded into commercially available mixed-signal PSoC reconfigurable device without any external components. Proposed design is optimized for reduction of influence of supply voltage to the quality of generated random bit stream. The influence of circuit non-idealities is significantly reduced by the proposed XOR corrector and optimized circuit topology. The ultimate output bit rate of proposed TRNG is 60 kbit/s and quality of generated bit-streams is confirmed by passing standard FIPS and correlation statistical tests performed in the full range of PSoC device supply voltages.
{"title":"A Robust Chaos-Based True Random Number Generator Embedded in Reconfigurable Switched-Capacitor Hardware","authors":"M. Drutarovský, P. Galajda","doi":"10.1109/RADIOELEK.2007.371423","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371423","url":null,"abstract":"This paper presents a new chaos-based True Random Number Generator (TRNG) with decreased voltage supply sensitivity. Contrary to the traditionally used sources of randomness it uses well-defined deterministic switched-capacitor circuit that exhibits chaos. The whole design is embedded into commercially available mixed-signal PSoC reconfigurable device without any external components. Proposed design is optimized for reduction of influence of supply voltage to the quality of generated random bit stream. The influence of circuit non-idealities is significantly reduced by the proposed XOR corrector and optimized circuit topology. The ultimate output bit rate of proposed TRNG is 60 kbit/s and quality of generated bit-streams is confirmed by passing standard FIPS and correlation statistical tests performed in the full range of PSoC device supply voltages.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121589580","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371695
P. Piksa, P. Černý
A horn antenna with the gain equal to 20 dB at the frequency of 40 GHz has far-field in the distance of 0.4 m for the plane wave radiation and has a very wide beam-width. In case of adding and using of dielectric lens, the plane wave is created at the distance of 92 mm with the Gaussian amplitude distribution and focused into the very narrow beam. This energy focusing is used in the microwave, millimeter-wave and terahertz spectroscopies in order to reach the optimal coupling of energy into the measuring cuvette. This paper discusses the differences between focusing by a dielectric lens in the optical meaning with the ideal point source or Gaussian beam with respect to the real source represented by the horn antenna. The results of this paper consist of the location, where the focused beam is the narrowest, and the power distribution in this distance.
{"title":"Near-field Measurement of Gaussian Beam behind Dielectric Lens","authors":"P. Piksa, P. Černý","doi":"10.1109/RADIOELEK.2007.371695","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371695","url":null,"abstract":"A horn antenna with the gain equal to 20 dB at the frequency of 40 GHz has far-field in the distance of 0.4 m for the plane wave radiation and has a very wide beam-width. In case of adding and using of dielectric lens, the plane wave is created at the distance of 92 mm with the Gaussian amplitude distribution and focused into the very narrow beam. This energy focusing is used in the microwave, millimeter-wave and terahertz spectroscopies in order to reach the optimal coupling of energy into the measuring cuvette. This paper discusses the differences between focusing by a dielectric lens in the optical meaning with the ideal point source or Gaussian beam with respect to the real source represented by the horn antenna. The results of this paper consist of the location, where the focused beam is the narrowest, and the power distribution in this distance.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121543464","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371416
D. Biolek, V. Biolková, Z. Kolka
A generalization of the model of PWM switch according to Dijk et al. for averaged modeling of switched DC-DC converters is proposed. This model now includes the on-resistance of the active switch, and the forward voltage drop and the differential resistance of diode-type passive switch. The way this model is compiled allows for the influence of parasitic ESRs of the capacitors in the circuit such that the resulting equations are equivalent to the averaged state space equations. The procedure of PSPICE modeling and the results of computer simulation of boost converter are shown.
{"title":"SPICE Modeling of Switched DC-DC Converters via Generalized Model of PWM Switch","authors":"D. Biolek, V. Biolková, Z. Kolka","doi":"10.1109/RADIOELEK.2007.371416","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371416","url":null,"abstract":"A generalization of the model of PWM switch according to Dijk et al. for averaged modeling of switched DC-DC converters is proposed. This model now includes the on-resistance of the active switch, and the forward voltage drop and the differential resistance of diode-type passive switch. The way this model is compiled allows for the influence of parasitic ESRs of the capacitors in the circuit such that the resulting equations are equivalent to the averaged state space equations. The procedure of PSPICE modeling and the results of computer simulation of boost converter are shown.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126948854","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371651
M. Stork
Frequency synthesizers are an essential part of any modern transceiver system. They generate clock and oscillator signals needed for up and down conversion. Today's communication standards demand both high frequency accuracy and fast frequency settling. The fine frequency resolution, low spurious signals, accuracy and stability are most important for these devices. In this paper, the new frequency synthesizer architecture based on direct synthesis and coincidence mixer is presented. The simulation results are also shown.
{"title":"Frequency Synthesizer Based on Coincidence Mixer","authors":"M. Stork","doi":"10.1109/RADIOELEK.2007.371651","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371651","url":null,"abstract":"Frequency synthesizers are an essential part of any modern transceiver system. They generate clock and oscillator signals needed for up and down conversion. Today's communication standards demand both high frequency accuracy and fast frequency settling. The fine frequency resolution, low spurious signals, accuracy and stability are most important for these devices. In this paper, the new frequency synthesizer architecture based on direct synthesis and coincidence mixer is presented. The simulation results are also shown.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134502326","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371656
T. Tokar, D. Levický
Digital watermarking has been proposed as a method for discouraging illegal copying and distribution of copyrighted material. Many proposed methods in digital watermarking are not robust against geometrical attacks. This paper presents a new algorithm that improves the robustness of watermarking methods against geometrical operations. We briefly described affine transformation and its major properties too. Finally, we also present results, which verify the enhanced robustness of proposed algorithm against geometrical attacks.
{"title":"Robust Watermarking of Gray Scale Images by Using Synchronization Templates","authors":"T. Tokar, D. Levický","doi":"10.1109/RADIOELEK.2007.371656","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371656","url":null,"abstract":"Digital watermarking has been proposed as a method for discouraging illegal copying and distribution of copyrighted material. Many proposed methods in digital watermarking are not robust against geometrical attacks. This paper presents a new algorithm that improves the robustness of watermarking methods against geometrical operations. We briefly described affine transformation and its major properties too. Finally, we also present results, which verify the enhanced robustness of proposed algorithm against geometrical attacks.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131640996","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371655
Ĺ. Syrová, R. Ravas, J. Grman
The contribution treats the topic of processing the experimentally gained information on the properties of optically transparent polymeric foils. Schlieren optical system was used to examine and visualize refractive index distribution. Experimental results of statistical and frequency approach to classification of different types of polymeric foils into classes are compared.
{"title":"Comparison between Statistical and Frequency Approach to Classification of Visualized Transparent Polymeric Foils","authors":"Ĺ. Syrová, R. Ravas, J. Grman","doi":"10.1109/RADIOELEK.2007.371655","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371655","url":null,"abstract":"The contribution treats the topic of processing the experimentally gained information on the properties of optically transparent polymeric foils. Schlieren optical system was used to examine and visualize refractive index distribution. Experimental results of statistical and frequency approach to classification of different types of polymeric foils into classes are compared.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130975370","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371420
T. Dostil, V. Axman
The paper deals with the classical three-port current conveyors so called second generation one (CC II). A unique application of the CC II is discussed, when the terminals Y and Z are connected together. Using this way a negative impedance converter is obtained as a suitable building block in applications given there. Specially a synthesis of the several continuous-time ARC biquadratic (second-order) filters, having or not transmission zero, is given there too.
{"title":"Current Conveyor CC II with Connected Ports Y-Z","authors":"T. Dostil, V. Axman","doi":"10.1109/RADIOELEK.2007.371420","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371420","url":null,"abstract":"The paper deals with the classical three-port current conveyors so called second generation one (CC II). A unique application of the CC II is discussed, when the terminals Y and Z are connected together. Using this way a negative impedance converter is obtained as a suitable building block in applications given there. Specially a synthesis of the several continuous-time ARC biquadratic (second-order) filters, having or not transmission zero, is given there too.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131238371","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371467
J. Húska, P. Kulla
In this paper a new fast block based motion estimation algorithm is presented. The new algorithm is based on well known diamond search with incorporated recursive and multi stage techniques. Its main benefit against other existing fast block based motion estimation algorithms is the ability to overcome the ambiguity in motion estimation (aperture problem, indeterminate flow vector in regions with constant brightness) that yield from optical flow equation. These problems are eliminated due to our new search strategy which employs fact that the image pixels corresponding to the same object projection all account similar movement. The algorithm with combined recursive and multi stage techniques is capable of estimating vector motion fields with eliminated chaotic motion fields and approaching true motion field.
{"title":"A New Recursive Search with Multi Stage Approach for Fast Block Based True Motion Estimation","authors":"J. Húska, P. Kulla","doi":"10.1109/RADIOELEK.2007.371467","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371467","url":null,"abstract":"In this paper a new fast block based motion estimation algorithm is presented. The new algorithm is based on well known diamond search with incorporated recursive and multi stage techniques. Its main benefit against other existing fast block based motion estimation algorithms is the ability to overcome the ambiguity in motion estimation (aperture problem, indeterminate flow vector in regions with constant brightness) that yield from optical flow equation. These problems are eliminated due to our new search strategy which employs fact that the image pixels corresponding to the same object projection all account similar movement. The algorithm with combined recursive and multi stage techniques is capable of estimating vector motion fields with eliminated chaotic motion fields and approaching true motion field.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132546336","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371676
M. Horvath, R. Seller
An X-band Side Looking Airborne Radar is being developed and tested. It uses solid state electronics and phase modulated impulses. The first images show that rivers, lakes, buildings, roads, railroads and agricultural fields can be identified.
{"title":"Microwave Imaging Using Spread Spectrum Modulation","authors":"M. Horvath, R. Seller","doi":"10.1109/RADIOELEK.2007.371676","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371676","url":null,"abstract":"An X-band Side Looking Airborne Radar is being developed and tested. It uses solid state electronics and phase modulated impulses. The first images show that rivers, lakes, buildings, roads, railroads and agricultural fields can be identified.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123783007","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371422
K. Radkovsk, M. Kaska, Z. Motyčka, P. Fiala, P. Drexler, T. Jirků, Z. Szabó, E. Kroutilová
The article deals with results which were obtained during the design of LVDS (low voltage differential signaling) bus. This bus is very resistant to interference from the environment and to spurious emission of electromagnetic fields. According to requirements we prepared designs of LVDS by means of numerical methods. The design was realized and its parameters verified experimentally. The basic parameter of bus impedance Z = 100 Omega, frequency f1 = 100 MHz of the first harmonic of rectangle signal.
{"title":"The Design of LVDS Bus with High EMC Compliance","authors":"K. Radkovsk, M. Kaska, Z. Motyčka, P. Fiala, P. Drexler, T. Jirků, Z. Szabó, E. Kroutilová","doi":"10.1109/RADIOELEK.2007.371422","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371422","url":null,"abstract":"The article deals with results which were obtained during the design of LVDS (low voltage differential signaling) bus. This bus is very resistant to interference from the environment and to spurious emission of electromagnetic fields. According to requirements we prepared designs of LVDS by means of numerical methods. The design was realized and its parameters verified experimentally. The basic parameter of bus impedance Z = 100 Omega, frequency f1 = 100 MHz of the first harmonic of rectangle signal.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"331 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125791399","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：