The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
Charles Razzell - One of the best experts on this subject based on the ideXlab platform.
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an interference robust Receiver for ultra wideband radio in sige bicmos technology
IEEE Journal of Solid-state Circuits, 2005Co-Authors: Raf Roovers, Jozef Reinerus Maria Bergervoet, K S Harish, Dominicus M W Leenaerts, H Waite, Y Zhang, S Aggarwal, R C H Van De Beek, G Van Der Weide, Charles RazzellAbstract:A 3.1-4.8 GHz ultra-wideband (UWB) Receiver front-end for high data rate, short-range communication is presented. The Receiver, based on the Multi Band OFDM Alliance (MBOA) standard proposal, consists of a zero-IF Receive Chain and an ultra-fast frequency-hopping synthesizer. The combination of high-linearity RF circuits, aggressive baseband filtering and low local oscillator spurs from the synthesizer results in an interference-robust Receiver, having the ability to co-exist with systems operating in the 2.4-GHz and 5-GHz ISM bands. The packaged device shows an overall noise figure of 4.5 dB and has a measured input IP3 of -6 dBm and input IP2 of +25 dBm. Spurious tones generated by the synthesizer are below -45 dBc and -50 dBc in the 2.4-GHz and 5-GHz ISM bands, respectively. The hopping speed is well below the required 9.5 ns. The complete Receive Chain has been realized in a 0.25 /spl mu/m BiCMOS technology and draws 78mA from a 2.5-V supply.
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an interference robust Receive Chain for uwb radio in sige bicmos
International Solid-State Circuits Conference, 2005Co-Authors: Jozef Reinerus Maria Bergervoet, K S Harish, G Van Der Weide, Dominicus M W Leenaerts, R C H Van De Beek, H Waite, Y Zhang, S Aggarwal, Charles Razzell, Raf RooversAbstract:A fully integrated Receive Chain for UWB radio in SiGe BiCMOS is presented. The packaged device includes a wideband LNA, a mixer, and an IF filter and has an overall NF of 7.5 dB. The IIP3 of -3 dBm and the accurately controlled and steep filter characteristic enables a robust coexistence with systems working in the 2.4 and 5 GHz bands.
Raf Roovers - One of the best experts on this subject based on the ideXlab platform.
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a broadband Receive Chain in 65nm cmos
International Solid-State Circuits Conference, 2007Co-Authors: S Lee, K S Harish, Raf Roovers, J Bergervoet, D M W Leenaerts, R Van De Beek, G Van Der WeideAbstract:A fully integrated 65nm CMOS broadband RX front-end using a double-loop transformer-feedback LNA is presented. The frequency band from 2 to 8GHz is covered while the NF remains between 4.5 and 5.5dB and IIP3 is -7dBm. The active die area is 0.09mm2 and the circuit consumes 51 mW from a 1.2V supply
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an interference robust Receiver for ultra wideband radio in sige bicmos technology
IEEE Journal of Solid-state Circuits, 2005Co-Authors: Raf Roovers, Jozef Reinerus Maria Bergervoet, K S Harish, Dominicus M W Leenaerts, H Waite, Y Zhang, S Aggarwal, R C H Van De Beek, G Van Der Weide, Charles RazzellAbstract:A 3.1-4.8 GHz ultra-wideband (UWB) Receiver front-end for high data rate, short-range communication is presented. The Receiver, based on the Multi Band OFDM Alliance (MBOA) standard proposal, consists of a zero-IF Receive Chain and an ultra-fast frequency-hopping synthesizer. The combination of high-linearity RF circuits, aggressive baseband filtering and low local oscillator spurs from the synthesizer results in an interference-robust Receiver, having the ability to co-exist with systems operating in the 2.4-GHz and 5-GHz ISM bands. The packaged device shows an overall noise figure of 4.5 dB and has a measured input IP3 of -6 dBm and input IP2 of +25 dBm. Spurious tones generated by the synthesizer are below -45 dBc and -50 dBc in the 2.4-GHz and 5-GHz ISM bands, respectively. The hopping speed is well below the required 9.5 ns. The complete Receive Chain has been realized in a 0.25 /spl mu/m BiCMOS technology and draws 78mA from a 2.5-V supply.
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an interference robust Receive Chain for uwb radio in sige bicmos
International Solid-State Circuits Conference, 2005Co-Authors: Jozef Reinerus Maria Bergervoet, K S Harish, G Van Der Weide, Dominicus M W Leenaerts, R C H Van De Beek, H Waite, Y Zhang, S Aggarwal, Charles Razzell, Raf RooversAbstract:A fully integrated Receive Chain for UWB radio in SiGe BiCMOS is presented. The packaged device includes a wideband LNA, a mixer, and an IF filter and has an overall NF of 7.5 dB. The IIP3 of -3 dBm and the accurately controlled and steep filter characteristic enables a robust coexistence with systems working in the 2.4 and 5 GHz bands.
Thorsten M Buzug - One of the best experts on this subject based on the ideXlab platform.
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highly symmetric filter for a fully differential Receive Chain
International Journal on Magnetic Particle Imaging, 2020Co-Authors: Jonas Schumacher, Ankit Malhotra, Ksenija Grafe, Thorsten M BuzugAbstract:Differential signaling can provide a higher fidelity of the Receive signals in MPI, which is especially important for mobile scanner setups not being operated in a shielding room. A passive, highly symmetrical filter is presented as a part of the fully differential Receive Chain of the scanner setup. Due to the combined use with a gradiometric Receive coil, the requirements for the components in terms of voltage and current specifications can be lowered which allows for partly building the filter on a PCB with well-matched SMD capacitors and trace lengths. The achieved attenuation for the differential-mode excitation field feedthrough is 77 dB while providing a common-mode rejection of more than 49 dB throughout the Receive bandwidth. Int. J. Mag. Part. Imag. 6(2), Suppl. 1, 2020, Article ID: 2009031, DOI: 10.18416/IJMPI.2020.2009031
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analog Receive signal processing for magnetic particle imaging
Medical Physics, 2013Co-Authors: Matthias Graeser, Timo F Sattel, Tobias Knopp, M Gruttner, Thorsten M BuzugAbstract:Purpose: Magnetic particle imaging (MPI) applies oscillating magnetic fields to determine the distribution of magnetic nanoparticlesin vivo. Using a Receive coil, the change of the particle magnetization can be detected. However, the signal induced by the nanoparticles is superimposed by the direct feedthrough interference of the sinusoidal excitation field, which couples into the Receive coils. As the latter is several magnitudes higher, the extraction of the particle signal from the excitation signal is a challenging task. Methods: One way to remove the interfering signal is to suppress the excitation signal by means of a band-stop filter. However, this technique removes parts of the desired particle signal, which are essential for direct reconstruction of the particle concentration. A way to recover the entire particle signal is to cancel out the excitation signal by coupling a matching cancellation signal into the Receive Chain. However, the suppression rates that can be achieved by signal cancellation are not as high as with the filtering method, which limits the sensitivity of this method. In order to unite the advantages of both methods, in this work the authors propose to combine the filtering and the cancellation technique. All methods were compared by measuring 10 μl Resovist, in the same field generator only switching the signal processing parts. Results: The reconstructed time signals of the three methods, show the advantage of the proposed combination of filtering and cancellation. The method preserves the fundamental frequency and is able to detect the tracer signal at its full bandwidth even for low concentrations. Conclusions: By recovering the full particle signal the SNR can be improved and errors in the x-space reconstruction are prevented. The authors show that the combined method provides this full particle signal and makes it possible to improve image quality.
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2d model based reconstruction for magnetic particle imaging
Medical Physics, 2010Co-Authors: Tobias Knopp, Sven Biederer, Timo F Sattel, Jurgen Rahmer, Jurgen Weizenecker, Bernhard Gleich, Jorn Borgert, Thorsten M BuzugAbstract:Purpose: Magnetic particle imaging (MPI) is a new quantitative imaging technique capable of determining the spatial distribution of superparamagnetic nanoparticles at high temporal and spatial resolution. For reconstructing this spatial distribution, the particle dynamics and the scanner properties have to be known. To date, they are obtained in a tedious calibration procedure by measuring the magnetization response of a small delta sample shifted through the measuring field. Recently, first reconstruction results using a 1D model-based system function were published, showing comparable image quality as obtained with a measured system function. In this work, first 2D model-based reconstruction results of measured MPI data are presented. Methods: To simulate the system function, various parameters have to be modeled, namely, the magnetic field, the particle magnetization, the voltage induced in the Receive coils, and the transfer function of the Receive Chain. To study the accuracy of the model-based approach, 2D MPI data are measured and reconstructed with modeled and measured system functions. Results: It is found that the model-based system function is sufficiently accurate to allow for reconstructing experimental data. The resulting image quality is close to that obtained with a measurement-basedreconstruction. Conclusions: The model-based system function approach addresses a major drawback of the measurement-based procedure, namely, the long acquisition time. In this work, the acquisition of the measurement-based system function took 45 min , while the model-based system function was obtained in only 15 s . For 3D data, where the acquisition of the measurement-based system function takes more than 6 h , the need for an efficient system function generation is even more obvious.
Jozef Reinerus Maria Bergervoet - One of the best experts on this subject based on the ideXlab platform.
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an interference robust Receiver for ultra wideband radio in sige bicmos technology
IEEE Journal of Solid-state Circuits, 2005Co-Authors: Raf Roovers, Jozef Reinerus Maria Bergervoet, K S Harish, Dominicus M W Leenaerts, H Waite, Y Zhang, S Aggarwal, R C H Van De Beek, G Van Der Weide, Charles RazzellAbstract:A 3.1-4.8 GHz ultra-wideband (UWB) Receiver front-end for high data rate, short-range communication is presented. The Receiver, based on the Multi Band OFDM Alliance (MBOA) standard proposal, consists of a zero-IF Receive Chain and an ultra-fast frequency-hopping synthesizer. The combination of high-linearity RF circuits, aggressive baseband filtering and low local oscillator spurs from the synthesizer results in an interference-robust Receiver, having the ability to co-exist with systems operating in the 2.4-GHz and 5-GHz ISM bands. The packaged device shows an overall noise figure of 4.5 dB and has a measured input IP3 of -6 dBm and input IP2 of +25 dBm. Spurious tones generated by the synthesizer are below -45 dBc and -50 dBc in the 2.4-GHz and 5-GHz ISM bands, respectively. The hopping speed is well below the required 9.5 ns. The complete Receive Chain has been realized in a 0.25 /spl mu/m BiCMOS technology and draws 78mA from a 2.5-V supply.
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an interference robust Receive Chain for uwb radio in sige bicmos
International Solid-State Circuits Conference, 2005Co-Authors: Jozef Reinerus Maria Bergervoet, K S Harish, G Van Der Weide, Dominicus M W Leenaerts, R C H Van De Beek, H Waite, Y Zhang, S Aggarwal, Charles Razzell, Raf RooversAbstract:A fully integrated Receive Chain for UWB radio in SiGe BiCMOS is presented. The packaged device includes a wideband LNA, a mixer, and an IF filter and has an overall NF of 7.5 dB. The IIP3 of -3 dBm and the accurately controlled and steep filter characteristic enables a robust coexistence with systems working in the 2.4 and 5 GHz bands.
K S Harish - One of the best experts on this subject based on the ideXlab platform.
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a broadband Receive Chain in 65nm cmos
International Solid-State Circuits Conference, 2007Co-Authors: S Lee, K S Harish, Raf Roovers, J Bergervoet, D M W Leenaerts, R Van De Beek, G Van Der WeideAbstract:A fully integrated 65nm CMOS broadband RX front-end using a double-loop transformer-feedback LNA is presented. The frequency band from 2 to 8GHz is covered while the NF remains between 4.5 and 5.5dB and IIP3 is -7dBm. The active die area is 0.09mm2 and the circuit consumes 51 mW from a 1.2V supply
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an interference robust Receiver for ultra wideband radio in sige bicmos technology
IEEE Journal of Solid-state Circuits, 2005Co-Authors: Raf Roovers, Jozef Reinerus Maria Bergervoet, K S Harish, Dominicus M W Leenaerts, H Waite, Y Zhang, S Aggarwal, R C H Van De Beek, G Van Der Weide, Charles RazzellAbstract:A 3.1-4.8 GHz ultra-wideband (UWB) Receiver front-end for high data rate, short-range communication is presented. The Receiver, based on the Multi Band OFDM Alliance (MBOA) standard proposal, consists of a zero-IF Receive Chain and an ultra-fast frequency-hopping synthesizer. The combination of high-linearity RF circuits, aggressive baseband filtering and low local oscillator spurs from the synthesizer results in an interference-robust Receiver, having the ability to co-exist with systems operating in the 2.4-GHz and 5-GHz ISM bands. The packaged device shows an overall noise figure of 4.5 dB and has a measured input IP3 of -6 dBm and input IP2 of +25 dBm. Spurious tones generated by the synthesizer are below -45 dBc and -50 dBc in the 2.4-GHz and 5-GHz ISM bands, respectively. The hopping speed is well below the required 9.5 ns. The complete Receive Chain has been realized in a 0.25 /spl mu/m BiCMOS technology and draws 78mA from a 2.5-V supply.
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an interference robust Receive Chain for uwb radio in sige bicmos
International Solid-State Circuits Conference, 2005Co-Authors: Jozef Reinerus Maria Bergervoet, K S Harish, G Van Der Weide, Dominicus M W Leenaerts, R C H Van De Beek, H Waite, Y Zhang, S Aggarwal, Charles Razzell, Raf RooversAbstract:A fully integrated Receive Chain for UWB radio in SiGe BiCMOS is presented. The packaged device includes a wideband LNA, a mixer, and an IF filter and has an overall NF of 7.5 dB. The IIP3 of -3 dBm and the accurately controlled and steep filter characteristic enables a robust coexistence with systems working in the 2.4 and 5 GHz bands.
