This paper proposes a new architecture for multibit complex bandpass ΔΣAD modulators with built-in Switched-Capacitor (SC) circuits for application to Low-IF receivers such as used for Bluetooth and WLAN. In the realization of complex bandpass ΔΣAD modulators, we face the following problems: (i) SNR of AD converter is deteriorated by mismatches between internal analog I and Q paths. (ii) Layout design becomes complicated because of signal lines crossing by complex filter and feedback from DAC for I and Q paths in the complex modulator, and this increases required chip area. We propose a new structure for a complex bandpass ΔΣAD modulator which can be completely divided into two paths without layout crossing, and solves the problems mentioned above. The two parts of signal paths and circuits in the modulator are changed for I and Q while CLK is changed for High/Low by adding multiplexers. Symmetric circuits are used for I and Q paths at a certain timing, and they are switched by multiplexers to those used for Q and I paths at another timing. Therefore the influence from mismatches between I and Q paths is reduced by dynamic matching. As a result, the modulator is divided into two separate parts without crossing signal lines between I and Q paths and its layout design can be greatly simplified compared with conventional modulators. We have conducted MATLAB simulations to confirm the effectiveness of the proposed structure.
Hao SAN
Akira HAYAKAWA
Yoshitaka JINGU
Hiroki WADA
Hiroyuki HAGIWARA
Kazuyuki KOBAYASHI
Haruo KOBAYASHI
Tatsuji MATSUURA
Kouichi YAHAGI
Junya KUDOH
Hideo NAKANE
Masao HOTTA
Toshiro TSUKADA
Koichiro MASHIKO
Atsushi WADA
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Hao SAN, Akira HAYAKAWA, Yoshitaka JINGU, Hiroki WADA, Hiroyuki HAGIWARA, Kazuyuki KOBAYASHI, Haruo KOBAYASHI, Tatsuji MATSUURA, Kouichi YAHAGI, Junya KUDOH, Hideo NAKANE, Masao HOTTA, Toshiro TSUKADA, Koichiro MASHIKO, Atsushi WADA, "Complex Bandpass ΔΣAD Modulator Architecture without I, Q-Path Crossing Layout" in IEICE TRANSACTIONS on Fundamentals,
vol. E89-A, no. 4, pp. 908-915, April 2006, doi: 10.1093/ietfec/e89-a.4.908.
Abstract: This paper proposes a new architecture for multibit complex bandpass ΔΣAD modulators with built-in Switched-Capacitor (SC) circuits for application to Low-IF receivers such as used for Bluetooth and WLAN. In the realization of complex bandpass ΔΣAD modulators, we face the following problems: (i) SNR of AD converter is deteriorated by mismatches between internal analog I and Q paths. (ii) Layout design becomes complicated because of signal lines crossing by complex filter and feedback from DAC for I and Q paths in the complex modulator, and this increases required chip area. We propose a new structure for a complex bandpass ΔΣAD modulator which can be completely divided into two paths without layout crossing, and solves the problems mentioned above. The two parts of signal paths and circuits in the modulator are changed for I and Q while CLK is changed for High/Low by adding multiplexers. Symmetric circuits are used for I and Q paths at a certain timing, and they are switched by multiplexers to those used for Q and I paths at another timing. Therefore the influence from mismatches between I and Q paths is reduced by dynamic matching. As a result, the modulator is divided into two separate parts without crossing signal lines between I and Q paths and its layout design can be greatly simplified compared with conventional modulators. We have conducted MATLAB simulations to confirm the effectiveness of the proposed structure.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e89-a.4.908/_p
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@ARTICLE{e89-a_4_908,
author={Hao SAN, Akira HAYAKAWA, Yoshitaka JINGU, Hiroki WADA, Hiroyuki HAGIWARA, Kazuyuki KOBAYASHI, Haruo KOBAYASHI, Tatsuji MATSUURA, Kouichi YAHAGI, Junya KUDOH, Hideo NAKANE, Masao HOTTA, Toshiro TSUKADA, Koichiro MASHIKO, Atsushi WADA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Complex Bandpass ΔΣAD Modulator Architecture without I, Q-Path Crossing Layout},
year={2006},
volume={E89-A},
number={4},
pages={908-915},
abstract={This paper proposes a new architecture for multibit complex bandpass ΔΣAD modulators with built-in Switched-Capacitor (SC) circuits for application to Low-IF receivers such as used for Bluetooth and WLAN. In the realization of complex bandpass ΔΣAD modulators, we face the following problems: (i) SNR of AD converter is deteriorated by mismatches between internal analog I and Q paths. (ii) Layout design becomes complicated because of signal lines crossing by complex filter and feedback from DAC for I and Q paths in the complex modulator, and this increases required chip area. We propose a new structure for a complex bandpass ΔΣAD modulator which can be completely divided into two paths without layout crossing, and solves the problems mentioned above. The two parts of signal paths and circuits in the modulator are changed for I and Q while CLK is changed for High/Low by adding multiplexers. Symmetric circuits are used for I and Q paths at a certain timing, and they are switched by multiplexers to those used for Q and I paths at another timing. Therefore the influence from mismatches between I and Q paths is reduced by dynamic matching. As a result, the modulator is divided into two separate parts without crossing signal lines between I and Q paths and its layout design can be greatly simplified compared with conventional modulators. We have conducted MATLAB simulations to confirm the effectiveness of the proposed structure.},
keywords={},
doi={10.1093/ietfec/e89-a.4.908},
ISSN={1745-1337},
month={April},}
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TY - JOUR
TI - Complex Bandpass ΔΣAD Modulator Architecture without I, Q-Path Crossing Layout
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 908
EP - 915
AU - Hao SAN
AU - Akira HAYAKAWA
AU - Yoshitaka JINGU
AU - Hiroki WADA
AU - Hiroyuki HAGIWARA
AU - Kazuyuki KOBAYASHI
AU - Haruo KOBAYASHI
AU - Tatsuji MATSUURA
AU - Kouichi YAHAGI
AU - Junya KUDOH
AU - Hideo NAKANE
AU - Masao HOTTA
AU - Toshiro TSUKADA
AU - Koichiro MASHIKO
AU - Atsushi WADA
PY - 2006
DO - 10.1093/ietfec/e89-a.4.908
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E89-A
IS - 4
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - April 2006
AB - This paper proposes a new architecture for multibit complex bandpass ΔΣAD modulators with built-in Switched-Capacitor (SC) circuits for application to Low-IF receivers such as used for Bluetooth and WLAN. In the realization of complex bandpass ΔΣAD modulators, we face the following problems: (i) SNR of AD converter is deteriorated by mismatches between internal analog I and Q paths. (ii) Layout design becomes complicated because of signal lines crossing by complex filter and feedback from DAC for I and Q paths in the complex modulator, and this increases required chip area. We propose a new structure for a complex bandpass ΔΣAD modulator which can be completely divided into two paths without layout crossing, and solves the problems mentioned above. The two parts of signal paths and circuits in the modulator are changed for I and Q while CLK is changed for High/Low by adding multiplexers. Symmetric circuits are used for I and Q paths at a certain timing, and they are switched by multiplexers to those used for Q and I paths at another timing. Therefore the influence from mismatches between I and Q paths is reduced by dynamic matching. As a result, the modulator is divided into two separate parts without crossing signal lines between I and Q paths and its layout design can be greatly simplified compared with conventional modulators. We have conducted MATLAB simulations to confirm the effectiveness of the proposed structure.
ER -