A Noise-Shaping Algorithm of Multi-bit DAC Nonlinearities in Complex Bandpass ΔΣAD Modulators(<Special Section>Selected Papers from the 16th Workshop on Circuits and Systems in Karuizawa)
スポンサーリンク
概要
- 論文の詳細を見る
This paper presents a technique for improving the SNR and resolution of complex bandpass ΔΣADCs which are used for wireless communication systems such as cellular phone, wireless LAN and Bluetooth. Oversampling and noise-shaping are used to achieve high accuracy of a ΔΣAD modulator. However when a multi-bit internal DAC is used inside a modulator, nonlinearities of the DAC are not noise-shaped and the SNR of the ΔΣADC degrades. For the conversion of complex intermediate frequency (IF) input signals, a complex bandpass ΔΣAD modulator can provide superior performance to a pair of real bandpass ΔΣAD modulators of the same order. This paper proposes a new noise-shaping algorithm-implemented by adding simple digital circuitry-to reduce the effects of nonlinearities in multi-bit DACs of complex bandpass ΔΣAD modulators. We have performed simulation with MATLAB to verify the effectiveness of the algorithm, and the results show that the proposed algorithm can improve the SNR of a complex bandpass ΔΣADC with nonlinear internal multi-bit DACs.
- 2004-04-01
著者
-
SAN Hao
Department of Information Network Engineering, Tokyo City University
-
KOBAYASHI Haruo
Department of Electronic Engineering, Graduate School of Engineering, Gunma University
-
San Hao
Department Of Electronic Engineering Faculty Of Engineering Gunma University
-
Kobayashi Haruo
Department Of Electronic Engineering Faculty Of Engineering Gunma University
-
Kobayashi Haruo
The Department Of Electronic Engineering Faculty Of Engineering Gunma University
-
Kobayashi Haruo
Sanyo Lsi Design-system Soft Co. Ltd.
-
Kobayashi H
The Department Of Electronic Engineering Faculty Of Engineering Gunma University
-
Kobayashi H
Sanyo Lsi Design-system Soft Co. Ltd.
-
KAWAKAMI Shinya
Department of Electronic Engineering, Faculty of Engineering, Gunma University
-
KUROIWA Nobuyuki
Department of Electronic Engineering, Faculty of Engineering, Gunma University
-
Kuroiwa Nobuyuki
Department Of Electronic Engineering Faculty Of Engineering Gunma University
-
Kawakami Shinya
Department Of Electronic Engineering Faculty Of Engineering Gunma University
-
KOBAYASHI HARUO
Department of Animal Breeding, Faculty of Agriculture, University of Tokyo
関連論文
- Noise-Coupled ΔΣAD Modulator with Shared OP-Amp
- Noise-Coupled Image Rejection Architecture of Complex Bandpass ΔΣAD Modulator
- Cross-Noise-Coupled Architecture of Complex Bandpass ΔΣAD Modulator
- EFFECTS OF FORMALIN-PRESERVATION ON ELEMENT CONCENTRATIONS IN ANIMAL TISSUES
- Dose-response relationship of N-methyl-N-nitrosourea in inducing micrencephaly in mouse off-spring (NEREVOUS SYSTEM) (GENERAL SESSION BY POSTER PRESENTATION) (Proceedings of the 30th Annual Meeting)
- EMI Reduction by Spread-Spectrum Clocking in Digitally-Controlled DC-DC Converters
- Factors Influencing the Human Biochemical Responses to Mental Stresses : A Preliminary Study on Gender Difference, psychological Characteristics, properties of the Stresses, and Alleviation by the Action of Kai-Gou, a Relaxation strategy of Qi-Gong
- Effects of Kai-Gou(Air-Ball Handling), a Qi-Gong Strategy, on the Biofeedback Training for Enhancement of the Electroencephalographic α-Activity
- Analysis of Coupled Inductors for Low-Ripple Fast-Response Buck Converter
- Lack of Correlation of Organophosphorus-Induced Delayed Neuropathy with Neuropathy Target Esterase in Hens and Japanese Quails