The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Cet article propose une nouvelle technique de réalisation de la fonction de réjection d'image par architecture de couplage de bruit, qui est utilisée pour un modulateur passe-bande complexe ΔΣAD. Le modulateur passe-bande complexe ΔΣAD traite uniquement les signaux d'entrée I et Q, pas les signaux d'image, et la conversion AD peut être réalisée avec une faible dissipation de puissance. Il réalise un spectre asymétrique en forme de bruit, ce qui est souhaitable pour de telles applications de récepteurs à faible FI. Cependant, les performances du modulateur passe-bande complexe ΔΣAD souffrent de la disparité entre les chemins analogiques internes I et Q. L'inadéquation du chemin I/Q provoque un signal d'image et le bruit de quantification de la bande d'image miroir se replie dans la bande de signal souhaitée, ce qui dégrade le SQNDR (rapport signal sur bruit de quantification et distorsion) du modulateur. Dans l'architecture de modulateur que nous proposons, une encoche supplémentaire pour le rejet d'image est réalisée par une topologie couplée au bruit. Nous ajoutons simplement quelques condensateurs passifs et commutateurs au modulateur ; le circuit intégrateur supplémentaire composé d'un amplificateur opérationnel dans la réalisation classique de réjection d'image n'est pas nécessaire. Par conséquent, les performances du modulateur complexe peuvent être efficacement augmentées sans dissipation de puissance supplémentaire. Nous avons effectué une simulation avec MATLAB pour confirmer la validité de l'architecture proposée. Les résultats de la simulation montrent que l'architecture proposée peut réaliser efficacement le rejet d'image et améliorer le SQNDR du modulateur passe-bande complexe ΔΣAD.
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Hao SAN, Haruo KOBAYASHI, "Noise-Coupled Image Rejection Architecture of Complex Bandpass ΔΣAD Modulator" in IEICE TRANSACTIONS on Fundamentals,
vol. E93-A, no. 2, pp. 390-394, February 2010, doi: 10.1587/transfun.E93.A.390.
Abstract: This paper proposes a new realization technique of image rejection function by noise-coupling architecture, which is used for a complex bandpass ΔΣAD modulator. The complex bandpass ΔΣAD modulator processes just input I and Q signals, not image signals, and the AD conversion can be realized with low power dissipation. It realizes an asymmetric noise-shaped spectra, which is desirable for such low-IF receiver applications. However, the performance of the complex bandpass ΔΣAD modulator suffers from the mismatch between internal analog I and Q paths. I/Q path mismatch causes an image signal, and the quantization noise of the mirror image band aliases into the desired signal band, which degrades the SQNDR (Signal to Quantization Noise and Distortion Ratio) of the modulator. In our proposed modulator architecture, an extra notch for image rejection is realized by noise-coupled topology. We just add some passive capacitors and switches to the modulator; the additional integrator circuit composed of an operational amplifier in the conventional image rejection realization is not necessary. Therefore, the performance of the complex modulator can be effectively raised without additional power dissipation. We have performed simulation with MATLAB to confirm the validity of the proposed architecture. The simulation results show that the proposed architecture can achieve the realization of image-rejection effectively, and improve the SQNDR of the complex bandpass ΔΣAD modulator.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E93.A.390/_p
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@ARTICLE{e93-a_2_390,
author={Hao SAN, Haruo KOBAYASHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Noise-Coupled Image Rejection Architecture of Complex Bandpass ΔΣAD Modulator},
year={2010},
volume={E93-A},
number={2},
pages={390-394},
abstract={This paper proposes a new realization technique of image rejection function by noise-coupling architecture, which is used for a complex bandpass ΔΣAD modulator. The complex bandpass ΔΣAD modulator processes just input I and Q signals, not image signals, and the AD conversion can be realized with low power dissipation. It realizes an asymmetric noise-shaped spectra, which is desirable for such low-IF receiver applications. However, the performance of the complex bandpass ΔΣAD modulator suffers from the mismatch between internal analog I and Q paths. I/Q path mismatch causes an image signal, and the quantization noise of the mirror image band aliases into the desired signal band, which degrades the SQNDR (Signal to Quantization Noise and Distortion Ratio) of the modulator. In our proposed modulator architecture, an extra notch for image rejection is realized by noise-coupled topology. We just add some passive capacitors and switches to the modulator; the additional integrator circuit composed of an operational amplifier in the conventional image rejection realization is not necessary. Therefore, the performance of the complex modulator can be effectively raised without additional power dissipation. We have performed simulation with MATLAB to confirm the validity of the proposed architecture. The simulation results show that the proposed architecture can achieve the realization of image-rejection effectively, and improve the SQNDR of the complex bandpass ΔΣAD modulator.},
keywords={},
doi={10.1587/transfun.E93.A.390},
ISSN={1745-1337},
month={February},}
Copier
TY - JOUR
TI - Noise-Coupled Image Rejection Architecture of Complex Bandpass ΔΣAD Modulator
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 390
EP - 394
AU - Hao SAN
AU - Haruo KOBAYASHI
PY - 2010
DO - 10.1587/transfun.E93.A.390
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E93-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 2010
AB - This paper proposes a new realization technique of image rejection function by noise-coupling architecture, which is used for a complex bandpass ΔΣAD modulator. The complex bandpass ΔΣAD modulator processes just input I and Q signals, not image signals, and the AD conversion can be realized with low power dissipation. It realizes an asymmetric noise-shaped spectra, which is desirable for such low-IF receiver applications. However, the performance of the complex bandpass ΔΣAD modulator suffers from the mismatch between internal analog I and Q paths. I/Q path mismatch causes an image signal, and the quantization noise of the mirror image band aliases into the desired signal band, which degrades the SQNDR (Signal to Quantization Noise and Distortion Ratio) of the modulator. In our proposed modulator architecture, an extra notch for image rejection is realized by noise-coupled topology. We just add some passive capacitors and switches to the modulator; the additional integrator circuit composed of an operational amplifier in the conventional image rejection realization is not necessary. Therefore, the performance of the complex modulator can be effectively raised without additional power dissipation. We have performed simulation with MATLAB to confirm the validity of the proposed architecture. The simulation results show that the proposed architecture can achieve the realization of image-rejection effectively, and improve the SQNDR of the complex bandpass ΔΣAD modulator.
ER -