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N.B. de Carvalho
Researcher at University of Aveiro
Publications - 15
Citations - 876
N.B. de Carvalho is an academic researcher from University of Aveiro. The author has contributed to research in topics: Intermodulation & Nonlinear distortion. The author has an hindex of 12, co-authored 15 publications receiving 852 citations.
Papers
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Journal ArticleDOI
Large- and small-signal IMD behavior of microwave power amplifiers
N.B. de Carvalho,Jose C. Pedro +1 more
TL;DR: In this paper, the large-signal intermodulation distortion (IMD) sweet spots in microwave power amplifiers are studied and predicted using a new mathematical basis, and the variations in the IMD versus drive pattern with active bias point and the terminating matching networks are investigated.
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On the use of multitone techniques for assessing RF components' intermodulation distortion
Jose C. Pedro,N.B. de Carvalho +1 more
TL;DR: A comprehensive analysis of various techniques currently used for assessing microwave components' nonlinear distortion behavior is presented in this paper, where the output of a third-order system subject to a two- or three-tone input is given, and then used as the comparison reference for studying the response to a general multitone or random excitation.
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A comprehensive analysis of IMD behavior in RF CMOS power amplifiers
TL;DR: In this article, a comprehensive analysis of nonlinear intermodulation distortion (IMD) behavior in RF CMOS power amplifiers (PAs) is presented for small and large-signal operation regimes.
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Prediction of IMD in LDMOS transistor amplifiers using a new large-signal model
TL;DR: In this paper, the intermodulation distortion (IMD) behavior of LDMOS transistors is treated and an analysis is performed to explain measured IMD characteristics in different classes of operation.
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Multitone frequency-domain simulation of nonlinear circuits in large- and small-signal regimes
N.B. de Carvalho,Jose C. Pedro +1 more
TL;DR: The algorithm, based on the spectral-balance method, uses novel index-vector and convolution-matrix generation techniques that allowed the prediction of such complex behavior as spectral regrowth and noise-power ratio (NPR) tests of a class-B power amplifier or multitone intermodulation phenomena in a saturated multioctave amplifier.