The Experts below are selected from a list of 1422 Experts worldwide ranked by ideXlab platform
D K Paul - One of the best experts on this subject based on the ideXlab platform.
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aspects of the design of low noise negative resistance reflection mode transistor amplifiers
IEEE Transactions on Microwave Theory and Techniques, 1991Co-Authors: P Gardner, D K PaulAbstract:The authors consider the use of microwave transistors in the negative resistance reflection mode and present the conditions for optimum noise performance. Possible advantages include the possibility of higher gain in the millimeter-wave region, which can be achieved by absorbing the parasitic common Lead Inductance into the feedback circuit designed to generate the negative resistance, and the existence of a failsafe mode of operation, in that the failure of the active device or its power supply is likely to Lead a low return loss, resulting in a small insertion loss through the amplifiers, which may permit continued, although degraded, system operation. The latter potential advantage has proved to be of interest to radar system designers. >
Mendes De Moura L.f. - One of the best experts on this subject based on the ideXlab platform.
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High Frequency Electronic Transducer For Multiphase Flow Measurements
Braz Soc Mech Sci Rio de Janeiro Brazil, 2015Co-Authors: Belo F.a., Mendes De Moura L.f.Abstract:This paper describes an electronic transducer for multiphase flow measurement. Its high sensitivity, good signal to noise ratio and accuracy are achieved through an electrical impedance sensor with a special guard technique. The transducer consists of a wide bandwidth and high slew rate differentiator where the Lead Inductance and stray capacitance effects are compensated. The sensor edge effect is eliminated by using a guard electrode based on the virtual ground potential of the operational amplifier. A theoretical modeling and a calibration method are also presented. The results obtained seem to confirm the validity, of the proposed technique
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High Frequency Electronic Transducer For Multiphase Flow Measurements
Braz Soc Mech Sci Rio de Janeiro Brazil, 2015Co-Authors: Belo F.a., Mendes De Moura L.f.Abstract:This paper describes an electronic transducer for multiphase flow measurement. Its high sensitivity, good signal to noise ratio and accuracy are achieved through an electrical impedance sensor with a special guard technique. The transducer consists of a wide bandwidth and high slew rate differentiator where the Lead Inductance and stray capacitance effects are compensated. The sensor edge effect is eliminated by using a guard electrode based on the virtual ground potential of the operational amplifier. A theoretical modeling and a calibration method are also presented. The results obtained seem to confirm the validity, of the proposed technique.214611621Albouelwafa, M.S.A., Kendal, E.J.M., Determination of theoretical capacitance of a concave capacitance sensor (1979) Rev. Sci. Instrum., 50 (9), pp. 1158-1159Andreussi, P., Di Donfrancesco, A., Messia, M., An impedance method for the measurement of liquid hold-up in two-phase flow (1988) Int. J. Multiphase Flow, 14 (6), pp. 777-785Auracher, H., Daubert, J., A capacitance method for void fraction measurements in two-phase flow (1985) 2nd Int. Conf. on Multiphase Flow, pp. 425-441. , London, EnglandBelo, F.A., (1995) Application of Electronic Analysis to the Study of Multiphase Flow, , Ph.D. Thesis - Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, BrazilBelo, F.A., Leite, J.T.F., (1992) Electronic Analyzer of Quality, , SAE Brazil, São PauloBennada, M.D., Carru, J.C., Druon, C., A measuring device for the determination of electric permittivity in frequency range 0.1-300 MHz (1982) J. Phys. E: Sci. Instrum., 15, pp. 132-136Bruggeman, D.A.G., Berechnung verschiedener physikalischer konstanten von heterogenen substanzen (1935) Ann. Phys. Leipzig, 24, p. 636Bruns, E.R., Neto, B.B., Scarminio, I.S., (1996) Planejamento e Otimização de Experimentos, , Seg. ed., Editora da Unicamp, BrazilConey, M.W.E., The theory and application of conductance probes for the measurement of liquid film thickness in two-phase flow (1973) J. of Phys. E: Sci. Instrum., 6Dickin, F.J., Hoyle, B.S., Hunt, A., Huang, S.M., Ilyas, O., Lenn, C., Waterfall, R.A., Beck, M.S., Tomographic imaging of industrial process equipment: Techniques and application (1992) IEEE Proceeding-G, 139 (1), pp. 72-82(1984) On a Capacitance Comparator Measuring, , Patent n° 84087Fasching, G.E., Smith N.S., Jr., A capacitive system for three-dimensional imaging of fluidized beds (1991) Rev. Sci. Instrum., 62 (9)Floyed, R.E., Mcdermott, L.F., Smith, H.C., (1985) IBM Tech. Disclosure Bull., 27, pp. 5449-5450Geraets, J.J.M., Borst, J.C., A capacitance censor for two-phase void fraction measurement and flow pattern identification (1988) Int. J. Multiphase Flow, 14 (3), pp. 305-320Green, R.G., Cunlife, J.M., On-line measurements of two-phase flow with a frequency modulated capacitance transducer (1981) Int. Conf. on Advances in Flow Measurement Techniques, pp. 127-132. , Granfield, EnglandHeerens, W.C., Microelectric sensor technology (1986) J. Phys. E: Sci. Instrum., 19, pp. 897-906Huang, S.M., Fielden, J., Green, R.G., Beck, M.S., A new capacitance transducer for industrial applications (1988) J. of Phys. E: Sci. Instrum., 21, pp. 251-256Huang, S.M., Stott, A.L., Green, R.G., Beck, M.S., Electronic transducers for industrial measuring of low value capacitance (review article) (1988) J. of Physi. E: Sci. Instrum., 21, pp. 242-250Huang, S.M., Plaskowski, A.B., Xie, C.G., Beck, M.S., Tomographic imaging of two-component flow using capacitance sensors (1989) J. of Phys. E: Sci. Instrum., 22, pp. 173-177Huang, S.M., Xie, C.G., Salked, J.A., Plaskowski, A.B., Thorn, R., Williams, R.A., Hunt, A., Beck, M.S., Process tomography for identification, design and measurement in industrial systems (1992) Powder Technology, 69, pp. 85-92Huang, S.M., Xie, C.G., Thorn, R., Williams, R.A., Snowden, D., Beck, M.S., Design of sensor electronics for electrical capacitance tomography (1992) IEEE Proceeding-G, 139 (1), pp. 83-88Hussein, E.M.A., Meneley, D.A., Single exposure neutron tomography of two-phase flow (1986) Int. J. Multiphase Flow, 12, pp. 1-34Kanno, M., (1980) Measurements and Applications of Small Capacitance, 49 (9), pp. 905-912. , Oyo Butury, JapanKin, I.C., Torquato, S., Determination of the effective conductivity of heterogeneous media by Brownian simulation (1990) J. Appl. Phys., 68 (8)Kraus, K., Measurement of small capacitance by comparison (1980) Electron. Engng., 52 (23), p. 636McKee, S.L., Williams, R.A., Dyakowski, T., Bell, T.A., Industrial application of electrical tomography to conveying processes (1993) Trans. I. ChemE, 71Moura, L.F., Belo, F.A., Two-phase flow imaging by electrical capacitance tomography: Numerical simulation for image reconstruction algorithm development (1996) J. Brazilian Society of Mechanical Sciences, 19 (3), pp. 322-331Plaskowski, K., Beck, M.S., Krawaczynski, J.S., Flow imaging for multi-component flow measurement (1987) Trans. Inst. Meas. Control, 9 (2), pp. 108-112Purcell, E.M., (1973) Eletricidade e Magnetismo, Curso de Física de Berkley, , Editora Edgard Bluger LTDA, BrazilVinegar, H.J., Wellington, S.L., Tomographic imaging of three-phase flow experiments (1986) Rev. Sci. Instrum., 58, pp. 96-107Walz, F., An ultra-compact LC-oscillator for the study of lattice defects in magnetic materials (1995) Phys. Stat. Sol., 147, p. 237Xie, C.G., Plaskowski, A., Beck, M.S., 8-electrode capacitance system for two-component flow identification. Part 1: Tomographic flow imaging (1989) IEEE Proceedings-G, 136 (4), pp. 173-183Xie, C.G., Plaskowski, A., Beck, M.S., 8-electrode capacitance system for two-component flow identification. Part 2: Flow regime identification (1989) IEEE Proceedings-G, 136 (4), pp. 184-190Xie, C.G., Huang, S.M., Hoyle, B.S., Thorn, R., Lenn, C., Snowden, D., Beck, M.S., Electrical capacitance tomography for flow imaging: System model for development of image reconstruction algorithms and design of primary sensors (1992) IEEE Proceedings-G, 139 (1), pp. 89-9
P Gardner - One of the best experts on this subject based on the ideXlab platform.
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aspects of the design of low noise negative resistance reflection mode transistor amplifiers
IEEE Transactions on Microwave Theory and Techniques, 1991Co-Authors: P Gardner, D K PaulAbstract:The authors consider the use of microwave transistors in the negative resistance reflection mode and present the conditions for optimum noise performance. Possible advantages include the possibility of higher gain in the millimeter-wave region, which can be achieved by absorbing the parasitic common Lead Inductance into the feedback circuit designed to generate the negative resistance, and the existence of a failsafe mode of operation, in that the failure of the active device or its power supply is likely to Lead a low return loss, resulting in a small insertion loss through the amplifiers, which may permit continued, although degraded, system operation. The latter potential advantage has proved to be of interest to radar system designers. >
Belo F.a. - One of the best experts on this subject based on the ideXlab platform.
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High Frequency Electronic Transducer For Multiphase Flow Measurements
Braz Soc Mech Sci Rio de Janeiro Brazil, 2015Co-Authors: Belo F.a., Mendes De Moura L.f.Abstract:This paper describes an electronic transducer for multiphase flow measurement. Its high sensitivity, good signal to noise ratio and accuracy are achieved through an electrical impedance sensor with a special guard technique. The transducer consists of a wide bandwidth and high slew rate differentiator where the Lead Inductance and stray capacitance effects are compensated. The sensor edge effect is eliminated by using a guard electrode based on the virtual ground potential of the operational amplifier. A theoretical modeling and a calibration method are also presented. The results obtained seem to confirm the validity, of the proposed technique
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High Frequency Electronic Transducer For Multiphase Flow Measurements
Braz Soc Mech Sci Rio de Janeiro Brazil, 2015Co-Authors: Belo F.a., Mendes De Moura L.f.Abstract:This paper describes an electronic transducer for multiphase flow measurement. Its high sensitivity, good signal to noise ratio and accuracy are achieved through an electrical impedance sensor with a special guard technique. The transducer consists of a wide bandwidth and high slew rate differentiator where the Lead Inductance and stray capacitance effects are compensated. The sensor edge effect is eliminated by using a guard electrode based on the virtual ground potential of the operational amplifier. A theoretical modeling and a calibration method are also presented. The results obtained seem to confirm the validity, of the proposed technique.214611621Albouelwafa, M.S.A., Kendal, E.J.M., Determination of theoretical capacitance of a concave capacitance sensor (1979) Rev. Sci. Instrum., 50 (9), pp. 1158-1159Andreussi, P., Di Donfrancesco, A., Messia, M., An impedance method for the measurement of liquid hold-up in two-phase flow (1988) Int. J. Multiphase Flow, 14 (6), pp. 777-785Auracher, H., Daubert, J., A capacitance method for void fraction measurements in two-phase flow (1985) 2nd Int. Conf. on Multiphase Flow, pp. 425-441. , London, EnglandBelo, F.A., (1995) Application of Electronic Analysis to the Study of Multiphase Flow, , Ph.D. Thesis - Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, BrazilBelo, F.A., Leite, J.T.F., (1992) Electronic Analyzer of Quality, , SAE Brazil, São PauloBennada, M.D., Carru, J.C., Druon, C., A measuring device for the determination of electric permittivity in frequency range 0.1-300 MHz (1982) J. Phys. E: Sci. Instrum., 15, pp. 132-136Bruggeman, D.A.G., Berechnung verschiedener physikalischer konstanten von heterogenen substanzen (1935) Ann. Phys. Leipzig, 24, p. 636Bruns, E.R., Neto, B.B., Scarminio, I.S., (1996) Planejamento e Otimização de Experimentos, , Seg. ed., Editora da Unicamp, BrazilConey, M.W.E., The theory and application of conductance probes for the measurement of liquid film thickness in two-phase flow (1973) J. of Phys. E: Sci. Instrum., 6Dickin, F.J., Hoyle, B.S., Hunt, A., Huang, S.M., Ilyas, O., Lenn, C., Waterfall, R.A., Beck, M.S., Tomographic imaging of industrial process equipment: Techniques and application (1992) IEEE Proceeding-G, 139 (1), pp. 72-82(1984) On a Capacitance Comparator Measuring, , Patent n° 84087Fasching, G.E., Smith N.S., Jr., A capacitive system for three-dimensional imaging of fluidized beds (1991) Rev. Sci. Instrum., 62 (9)Floyed, R.E., Mcdermott, L.F., Smith, H.C., (1985) IBM Tech. Disclosure Bull., 27, pp. 5449-5450Geraets, J.J.M., Borst, J.C., A capacitance censor for two-phase void fraction measurement and flow pattern identification (1988) Int. J. Multiphase Flow, 14 (3), pp. 305-320Green, R.G., Cunlife, J.M., On-line measurements of two-phase flow with a frequency modulated capacitance transducer (1981) Int. Conf. on Advances in Flow Measurement Techniques, pp. 127-132. , Granfield, EnglandHeerens, W.C., Microelectric sensor technology (1986) J. Phys. E: Sci. Instrum., 19, pp. 897-906Huang, S.M., Fielden, J., Green, R.G., Beck, M.S., A new capacitance transducer for industrial applications (1988) J. of Phys. E: Sci. Instrum., 21, pp. 251-256Huang, S.M., Stott, A.L., Green, R.G., Beck, M.S., Electronic transducers for industrial measuring of low value capacitance (review article) (1988) J. of Physi. E: Sci. Instrum., 21, pp. 242-250Huang, S.M., Plaskowski, A.B., Xie, C.G., Beck, M.S., Tomographic imaging of two-component flow using capacitance sensors (1989) J. of Phys. E: Sci. Instrum., 22, pp. 173-177Huang, S.M., Xie, C.G., Salked, J.A., Plaskowski, A.B., Thorn, R., Williams, R.A., Hunt, A., Beck, M.S., Process tomography for identification, design and measurement in industrial systems (1992) Powder Technology, 69, pp. 85-92Huang, S.M., Xie, C.G., Thorn, R., Williams, R.A., Snowden, D., Beck, M.S., Design of sensor electronics for electrical capacitance tomography (1992) IEEE Proceeding-G, 139 (1), pp. 83-88Hussein, E.M.A., Meneley, D.A., Single exposure neutron tomography of two-phase flow (1986) Int. J. Multiphase Flow, 12, pp. 1-34Kanno, M., (1980) Measurements and Applications of Small Capacitance, 49 (9), pp. 905-912. , Oyo Butury, JapanKin, I.C., Torquato, S., Determination of the effective conductivity of heterogeneous media by Brownian simulation (1990) J. Appl. Phys., 68 (8)Kraus, K., Measurement of small capacitance by comparison (1980) Electron. Engng., 52 (23), p. 636McKee, S.L., Williams, R.A., Dyakowski, T., Bell, T.A., Industrial application of electrical tomography to conveying processes (1993) Trans. I. ChemE, 71Moura, L.F., Belo, F.A., Two-phase flow imaging by electrical capacitance tomography: Numerical simulation for image reconstruction algorithm development (1996) J. Brazilian Society of Mechanical Sciences, 19 (3), pp. 322-331Plaskowski, K., Beck, M.S., Krawaczynski, J.S., Flow imaging for multi-component flow measurement (1987) Trans. Inst. Meas. Control, 9 (2), pp. 108-112Purcell, E.M., (1973) Eletricidade e Magnetismo, Curso de Física de Berkley, , Editora Edgard Bluger LTDA, BrazilVinegar, H.J., Wellington, S.L., Tomographic imaging of three-phase flow experiments (1986) Rev. Sci. Instrum., 58, pp. 96-107Walz, F., An ultra-compact LC-oscillator for the study of lattice defects in magnetic materials (1995) Phys. Stat. Sol., 147, p. 237Xie, C.G., Plaskowski, A., Beck, M.S., 8-electrode capacitance system for two-component flow identification. Part 1: Tomographic flow imaging (1989) IEEE Proceedings-G, 136 (4), pp. 173-183Xie, C.G., Plaskowski, A., Beck, M.S., 8-electrode capacitance system for two-component flow identification. Part 2: Flow regime identification (1989) IEEE Proceedings-G, 136 (4), pp. 184-190Xie, C.G., Huang, S.M., Hoyle, B.S., Thorn, R., Lenn, C., Snowden, D., Beck, M.S., Electrical capacitance tomography for flow imaging: System model for development of image reconstruction algorithms and design of primary sensors (1992) IEEE Proceedings-G, 139 (1), pp. 89-9
F.h. Raab - One of the best experts on this subject based on the ideXlab platform.
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Class-F power amplifiers with maximally flat waveforms
IEEE Transactions on Microwave Theory and Techniques, 1997Co-Authors: F.h. RaabAbstract:Class-F power amplifiers (PA's) employ harmonic-frequency resonators to shape their drain or collector waveforms to improve efficiency. Generally, the output network must present the drain with either an open or short circuit at the harmonic frequencies. At VHF and higher frequencies, the drain capacitance, Lead Inductance, Lead length, and dispersion make implementation of reasonably ideal tuned circuits difficult. However it is possible to control the impedances at a finite number of harmonics. This note first derives the basic relationships among the Fourier coefficients of the waveforms and the performance of the amplifier. Fourier coefficients for maximally flat waveforms are then derived for inclusion of up to the fifth harmonic. Amplifier performance is then tabulated as a function of which harmonics are included in the voltage and current waveforms. Efficiency increases from 50% of class A toward 100% as harmonics are added. Power-output capability increases by up to 27%.