Search Results - "De Carvalho, N. B."

Agile All-Digital RF Transceiver Implemented in FPGA by Cordeiro, R. F., Prata, Andre, Oliveira, Arnaldo S. R., Vieira, Jose M. N., De Carvalho, N. B.

“…This paper presents a new all-digital transceiver architecture fully integrated into a single field-programmable gate array chip. Both the radio frequency (RF)…”
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Evaluating co-channel distortion ratio in microwave power amplifiers by Pedro, J.C., Borges de Carvalho, N.

“…Laboratory results, obtained with a novel setup for a corrected co-channel distortion ratio, validate the idea that no matter the notch width, a conventional…”
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Risk and protective behaviors for chronic non-communicable diseases among Brazilian adults by de Carvalho, R.B.N., Rauber, F., Claro, R.M., Levy, R.B.

“…This study aimed to analyze behavioral patterns of protective and risk factors for chronic non-communicable diseases (NCDs) among adults and to explore the…”
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A comprehensive analysis of IMD behavior in RF CMOS power amplifiers by Fager, C., Pedro, J.C., de Carvalho, N.B., Zirath, H., Fortes, F., Rosario, M.J.

“…This paper presents a comprehensive analysis of nonlinear intermodulation distortion (IMD) behavior in RF CMOS power amplifiers (PAs). Separate analyses are…”
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Prediction of IMD in LDMOS transistor amplifiers using a new large-signal model by Fager, C., Pedro, J.C., de Carvalho, N.B., Zirath, H.

“…In this paper, the intermodulation distortion (IMD) behavior of LDMOS transistors is treated. First, an analysis is performed to explain measured IMD…”
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Large- and small-signal IMD behavior of microwave power amplifiers by De Carvalho, N.B., Pedro, J.C.

“…In this paper, large-signal intermodulation distortion (IMD) sweet spots in microwave power amplifiers are studied and predicted using a new mathematical…”
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On the use of multitone techniques for assessing RF components' intermodulation distortion by Pedro, J.C., De Carvalho, N.B.

“…A comprehensive analysis of various techniques currently used for assessing microwave components' nonlinear distortion behavior is presented in this paper. The…”
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Acidity and Characterization of 12-Tungstophosphoric Acid Supported on Silica-Alumina by Mattos, Flávia C. G. de, Carvalho, Eduardo N. C. B. de, Freitas, Elon F. de, Paiva, Mateus F., Ghesti, Grace F., Macedo, Julio L. de, Dias, Sílvia C. L., Dias, José A.

“…This work deals with preparation and characterization of H3PW12O40 (H3PW) supported on silica-alumina. Impregnation of H3PW (15, 20, 30 and 40 wt.%) on…”
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Evaluation of signal-to-noise and distortion ratio degradation in nonlinear systems by Lavrador, P.M., de Carvalho, N.B., Pedro, J.C.

“…This paper presents a new figure-of-merit to evaluate signal-to-noise and distortion (SINAD) ratio degradation in nonlinear systems, herein referred to as the…”
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Multitone frequency-domain simulation of nonlinear circuits in large- and small-signal regimes by De Carvalho, N.B., Pedro, J.C.

“…Computer simulation of general microwave nonlinear circuits excited by a large number of input tones is addressed, The algorithm, based on the spectral-balance…”
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Characterizing nonlinear RF circuits for their in-band signal distortion by Pedro, J.C., de Carvalho, N.B.

“…This work presents a theoretical discussion on the ability of traditional noise power ratio (NPR) setups to characterize the in-band signal distortion of…”
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Resistive FET mixer conversion loss and IMD optimization by selective drain bias by Garcia, J.A., Pedro, J.C., De La Fuente, M. L., De Carvalho, N.B., Sanchez, A.M., Puente, A.T.

“…This paper describes a dedicated nonlinear MESFET model, which was used to accurately represent the device's drain-source current nonlinearity. An analytical…”
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Characterizing the gate-to-source nonlinear capacitor role on GaAs FET IMD performance by Garcia, J.A., Sanchez, A.M., Pedro, J.C., De Carvalho, N.B., Puente, A.T., Garcia, J.L.

“…This paper discusses, in a mathematical form and supported by a complete special experimental characterization, the gate-to-source nonlinear capacitor…”
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A comprehensive explanation of distortion sideband asymmetries by Borges de Carvalho, N., Pedro, J.C.

“…This paper presents a comprehensive study of intermodulation-distortion response asymmetries often observed in microwave nonlinear systems subject to a…”
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Estimation of the Boundary Heat Flux in Grinding via the Conjugate Gradient Method by De Carvalho, R N, Orlande, H R B, Ozisik, M N

“…The unknown boundary surface heat flux in workpieces during grinding is estimated by the application of inverse heat transfer analysis. The conjugate gradient…”
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Acidic characterization and activity of (NH(4))(x)Cs(2.5-x)H(0.5)PW(12)O(40) catalysts in the esterification reaction of oleic acid with ethanol by Santos, Joicy S, Dias, Jose A, Dias, Silvia C L, De Macedo, Julio L, Garcia, Fillipe A C, Almeida, Liana S, De Carvalho, Eduardo N C B

“…Ammonium and cesium derivatives from H(3)PW(12)O(40)(H(3)PW), namely (NH(4))(x)Cs(2.5-x)H(0.5)PW(12)O(40)(x=0.5, 1,1.5,2), were synthesized and structurally…”
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Intermodulation distortion behavior in LDMOS transistor amplifiers by Fager, C., de Carvalho, N.B., Pedro, J.C., Zirath, H.

“…An analysis of the intermodulation distortion (IMD) behavior of LDMOS transistor amplifiers is presented. It is shown that the turn-on region abruptness…”
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Large signal IMD sweet spots in microwave power amplifiers by de Carvalho, N.B., Pedro, J.C.

“…In this paper, large signal IMD sweet spots in microwave power amplifiers are investigated and predicted using a new mathematical basis. This type of nonlinear…”
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Novel artificial frequency mapping techniques for multi-tone simulation of mixers by Borges de Carvalho, N., Pedro, J.C.

“…This paper describes two new artificial frequency mapping techniques suitable for the simulation of RF/microwave mixers when excited by a multi-tone signal…”
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Noise and distortion figure - an extension of noise figure definition for nonlinear devices by Lavrador, P.M., de Carvalho, N.B., Pedro, J.C.

“…Deals in the integration of additive and nonlinear distortion noise contributions into a single new figure of merit: Noise and Distortion Figure, NDF. In the…”
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