The Experts below are selected from a list of 3573 Experts worldwide ranked by ideXlab platform
Mehdi Alouini - One of the best experts on this subject based on the ideXlab platform.
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Intermodulation distortion in microwave phase shifters based on slow and fast light propagation in semiconductor optical amplifiers.
Optics letters, 2010Co-Authors: Perrine Berger, Jerome Bourderionnet, Seán Ó Dúill, Fabien Bretenaker, Daniel Dolfi, Gadi Eisenstein, Mehdi AlouiniAbstract:We show theoretically and validate experimentally the effect of filtering on the nonlinear behavior of slow and fast light links based on coherent population oscillations in semiconductor optical amplifiers. The existence of a dip in the power-versus-current characteristics for the fundamental frequency, as well as for the third-order Intermodulation Product, is clearly evidenced. These two dips occur at different bias currents. Their depths increase as the filtering strength of the red sideband is increased, and they completely vanish in the unfiltered case. Influence on the microwave photonics link is discussed.
Perrine Berger - One of the best experts on this subject based on the ideXlab platform.
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Intermodulation distortion in microwave phase shifters based on slow and fast light propagation in semiconductor optical amplifiers.
Optics letters, 2010Co-Authors: Perrine Berger, Jerome Bourderionnet, Seán Ó Dúill, Fabien Bretenaker, Daniel Dolfi, Gadi Eisenstein, Mehdi AlouiniAbstract:We show theoretically and validate experimentally the effect of filtering on the nonlinear behavior of slow and fast light links based on coherent population oscillations in semiconductor optical amplifiers. The existence of a dip in the power-versus-current characteristics for the fundamental frequency, as well as for the third-order Intermodulation Product, is clearly evidenced. These two dips occur at different bias currents. Their depths increase as the filtering strength of the red sideband is increased, and they completely vanish in the unfiltered case. Influence on the microwave photonics link is discussed.
Frank E Van Vliet - One of the best experts on this subject based on the ideXlab platform.
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beamformer with constant gm vector modulators and its spatial Intermodulation distortion
IEEE Journal of Solid-state Circuits, 2017Co-Authors: Michiel C M Soer, Eric A M Klumperink, Dirkjan Van Den Broek, Bram Nauta, Frank E Van VlietAbstract:Spatial interference rejection in analog adaptive beamforming receivers can improve the distortion performance of the circuits following the beamforming network, but is susceptible to the nonlinearity of the beamforming network itself. This paper presents an analysis of Intermodulation Product cancellation in analog active phased array receivers and verifies the distortion improvement in a four-element adaptive beamforming receiver for low-power applications in the 1.0-2.5-GHz frequency band. In this architecture, a constant-Gm vector modulator is proposed that produces an accurate equidistance square constellation, leading to a sliced frontend design that is duplicated for each antenna element. By moving the transconductances to RF, a fourfold reduction in power is achieved, while simultaneously providing input impedance matching. The 65-nm implementation consumes between 6.5 and 9 mW per antenna element and shows a +1 to +20 dBm in-band and out-of-beam third-order intercept point due to Intermodulation distortion reduction.
C S Aitchison - One of the best experts on this subject based on the ideXlab platform.
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microwave amplifiers by injection.
2016Co-Authors: C S Aitchison, M Mbabele, Djuradj Budimir, Reza M. Moazzam, Fazal AliAbstract:Improvement of third-order Intermodulation Product of RF an
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improvement of third order Intermodulation Product of rf and microwave amplifiers by injection
IEEE Transactions on Microwave Theory and Techniques, 2001Co-Authors: C S Aitchison, M Mbabele, M R Moazzam, Djuradj BudimirAbstract:This paper discusses the improvement in the third-order Intermodulation Product (IM3) performance obtainable from RF and microwave amplifiers by two alternative injection techniques. The first is the addition to the amplifier input of the second harmonics of the input spectrum and the second is the addition to the amplifier input of the difference frequencies between the spectral components of the input signal. Both techniques are considered in theory, by simulation and in practice. Both techniques give useful improvements in two-tone IM3 performance. The second harmonic technique reduced the IM3 level by 43 dB in an amplifier at 835 MHz. The difference-frequency technique gave a reduction of 48 dB in an amplifier at 880 MHz. The difference-frequency technique also gives a greater improvement for complex spectra signals.
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the reduction of third order Intermodulation Product in microwave amplifiers
Solid State Power Amplification and Generation IEE Colloquium on, 1996Co-Authors: M R Moazzam, C S AitchisonAbstract:This paper suggests that the third order Intermodulation level in high frequency amplifiers can be reduced significantly by injecting the second harmonic of the input signal into the amplifier. Theory, simulation and practical measurement at 500 MHz are presented which support the suggestion. (5 pages)
Djuradj Budimir - One of the best experts on this subject based on the ideXlab platform.
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microwave amplifiers by injection.
2016Co-Authors: C S Aitchison, M Mbabele, Djuradj Budimir, Reza M. Moazzam, Fazal AliAbstract:Improvement of third-order Intermodulation Product of RF an
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improvement of third order Intermodulation Product of rf and microwave amplifiers by injection
IEEE Transactions on Microwave Theory and Techniques, 2001Co-Authors: C S Aitchison, M Mbabele, M R Moazzam, Djuradj BudimirAbstract:This paper discusses the improvement in the third-order Intermodulation Product (IM3) performance obtainable from RF and microwave amplifiers by two alternative injection techniques. The first is the addition to the amplifier input of the second harmonics of the input spectrum and the second is the addition to the amplifier input of the difference frequencies between the spectral components of the input signal. Both techniques are considered in theory, by simulation and in practice. Both techniques give useful improvements in two-tone IM3 performance. The second harmonic technique reduced the IM3 level by 43 dB in an amplifier at 835 MHz. The difference-frequency technique gave a reduction of 48 dB in an amplifier at 880 MHz. The difference-frequency technique also gives a greater improvement for complex spectra signals.