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研究生:莊博傑
研究生(外文):Po-Chieh Chuang
論文名稱:一種使用Sigma-Delta調變機制的心的雜訊容忍方法
論文名稱(外文):A New Noise-Tolerance Approach by using Sigma-Delta Modulation
指導教授:黃德成黃德成引用關係
學位類別:碩士
校院名稱:國立中興大學
系所名稱:資訊科學與工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:96
語文別:英文
論文頁數:66
中文關鍵詞:雜訊訊號處理容錯
外文關鍵詞:NoiseSoft ErrorSEUDSPSigma-Delta
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本論文以 Sigma-Delta 調變原理為基礎設計一雜訊容忍方法,可對受雜訊干擾的數位訊號進行還原,並可處理雜訊干擾時間為連續的情況,且具備不需要修改原始架構的優點。
Sigma-Delta 為一使用超取樣的調變法,擁有雜訊整形的能力。本論文設計一個四階單位元的 Sigma-Delta 調變器,並根據來源訊號設計相對應的 Butterworth 濾波器,用來對 Sigma-Delta 調變後訊號進行還原,並同時濾除訊號頻帶外的雜訊。
當系統的輸出訊號受到一能量上限為原始訊號 50% 的持續雜訊干擾,透過本方法可將訊號還原至與原始訊號平均誤差小於 2% 的還原訊號。
In recent years, for increasing processor performance, the microprocessor industry is driving the scaling of feature sizes into nanometer regime. The CMOS transistor sizes become smaller, causing their working voltages and threshold voltages become lower too. Even though, the noise never been reduced, but affecting the circuit more serious instead.
For this reason, we developed a noise tolerance approach by using sigma-delta modulation, which can recover the noisy signals. Beside most of the previously schemes based on solving Single Event Upset (SEU), our approach can get over the case of multiple faults, even the noise has been continued a long time. The other property is no need to change the original Digital Signal Processor (DSP).
Sigma-delta is a modulation based on over sampling, and the ability of noise shaping. In this paper, a fourth-order single-bit sigma-delta modulator has been presented. According to the input signal, uses a Butterworth filter as the sigma-delta output filter to remove the modulated out-bands noise.
Assuming that a DSP output signal is affected by noises, and the total noise energy is about 0~50% of the original signal, then using our approach can produce a recovery signal with a deviation under 2% of the original signal.
摘 要 i
Abstract ii
Index iii
List of Tables v
List of Figures vi
Chapter 1 Introduction - 1 -
1.1 General Background Information - 1 -
1.2 Noise - 1 -
1.2.1 Shot Noise - 2 -
1.2.2 Thermal Noise - 2 -
1.2.3 Flicker Noise[3] - 3 -
1.2.4 Burst Noise[3] - 5 -
1.2.5 Avalanche Noise[3] - 6 -
1.3 Research Background and Motivation - 6 -
1.4 Research Methods and Procedures - 7 -
1.5 Paper Framework - 8 -
Chapter 2 Related Work - 9 -
2.1 Algorithmic Noise-Tolerance (ANT) - 9 -
2.1.1 Prediction-Based ANT[8] - 10 -
2.1.2 Forward-Backward Predictor[9] - 11 -
2.1.3 Reduced-Precision Redundancy(RPR)-Based ANT[8] - 12 -
2.1.4 Spatial Algorithmic Soft Error Tolerance(S-ASET)[10][11] - 13 -
2.1.5 Spatio-Temporal ASET(ST-ASET)[10][11] - 14 -
2.1.6 Temporal ASET(T-ASET)[10][11] - 15 -
2.1.7 ANT Simulation Results - 15 -
2.2 Sigma-Delta Modulated signals - 17 -
2.2.1 Adder using Sigma-Delta Signals[14] - 18 -
2.2.2 Multiplier using Sigma-Delta Modulated Signals[14] - 19 -
2.2.3 Functionally DSP using Sigma-Delta Modulated Signals[15] - 20 -
2.3 Principle of Sigma-Delta Modulation[17][18] - 23 -
2.3.1 Sampling Theory - 25 -
2.3.2 Over Sampling - 26 -
2.3.3 Noise Shaping - 27 -
Chapter 3 System Design and Implementation - 30 -
3.1 System Architecture Introduction - 30 -
3.2 System Stability Analysis of Sigma-Delta Modulation - 31 -
3.2.1 Creating Equivalent Model - 31 -
3.2.2 Finding out Stability - 33 -
3.3 Stable Conditions of Sigma-Delta Modulation in System - 35 -
3.3.1 Stability in First State - 35 -
3.3.2 Stability in Other States - 37 -
3.4 Design Methods - 39 -
3.5 System Analysis - 43 -
Chapter 4 Simulations and Experiment Results - 47 -
4.1 Simulation Environment - 47 -
4.2 Analysis of Over Sampling and Noise Shaping - 47 -
4.3 Analysis of Noises in Sigma-Delta Modulator - 48 -
4.4 Non-Ideal System [25] - 50 -
4.5 Simulations and Results - 51 -
4.5 Analysis of Choosing OSR - 59 -
Chapter 5 Conclusions and Feature Works - 62 -
5.1 Conclusions - 62 -
5.2 Feature Works - 63 -
References - 64 -
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[18] 陳鏗元, 胡竹生, “A Full-Bridge Class-D Amplifier Using Sigma Delta Modulation”
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[20] 黃克強, “淺談Delta-Sigma 之工作原理”
[21] H. Inose, Y. Yasuda, and J. Murakami, “A Telemetering System by Code Modulation—Δ-Σ Modulation” IRE Trans. on Space Electronics and Telemetry, vol. SET-8, 1962, pp. 204-209
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[27] “The Freesound Project”, http://www.freesound.org
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