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姓名 何昇陽(Sheng-Yang Ho) 查詢紙本館藏 畢業系所 電機工程學系 論文名稱 應用於數位視頻廣播系統中具有自動增益控制之接受端濾波器設計
(A Continuous-Time Receive Filter Design with Automatic Gain Control for DVB-T/H Receiver)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 本論文描述一個應用在歐規陸地/手持式數位視頻廣播系統(DVB-T/H)中的類比前端電路(AFE),主要以基頻接收端通訊系統應用為目標,其內部使用一個經由數位控制的自動增益濾波器來促進接收機的系統整合性與電路積體化程度。為了改良系統,在接收端的訊號路徑上有一個可程式化增益連續時間濾波器,它使用寬頻且低功率的全差動運算放大器,來構成一個頻寬為4MHz的六階Chebyshev低通濾波器,其動態增益範圍有53dB,並且由一階的數位控制迴路來自動調整其增益量使其輸出可達200 。在輸入振幅為200 的情況時,經由雙端輸入所模擬出的總諧波失真(THD)小於 -60dB。而此電路在操作電壓為1.8V時,其功率損耗為14.3毫瓦,已經由佈局後(post-layout)的模擬所驗證,並使用台灣積體電路公司(TSMC)所提供的0.18μm 1P6M CMOS製程來製造。 摘要(英) This paper describes a digitally controlled automatic gain control (AGC) for the analog front-end (AFE), in which it can be used to support the digital video broadcasting in DZIF (double conversion with zero second IF) architecture. In order for system improvement, the receiving path contains a programmable-gain filter (PGF) with the self-tuning gain circuit. This proposed continuous-time filter is a 4MHz sixth-order Chebyshev low-pass Active-RC filter is also described in detail. In addition, an wideband and low power fully-differential operation amplifier (OPA) used for building the filter. The dynamic range of the PGF, which is controlled by a digital loop to form a first order system, is 53dB. The third-harmonic distortion is less than –60dB for differential input signal up to 200 . This chip has already been fabricated in a TSMC 0.18μm standard CMOS technology while the supply voltage is 1.8V and its power consumption is 14.3 . 關鍵字(中) ★ 數位視頻廣播系統
★ 自動增益控制
★ 可程式化增益濾波器關鍵字(英) ★ DVB-T/H
★ Automatic Gain Control
★ Programmable Gain Filter論文目次 摘 要 ..................................................................................................................I
Abstract ............................................................................................................... II
誌 謝 ............................................................................................................... III
目 錄 ...............................................................................................................IV
圖目錄 ..............................................................................................................VII
表目錄 ................................................................................................................ X
第一章 緒論....................................................................................................... 1
1.1 數位視頻廣播發展現況...................................................................... 1
1.1.1 陸地數位視頻廣播................................................................... 2
1.1.2 手持式數位視頻廣播............................................................... 6
1.2 研究動機.............................................................................................. 9
1.3 論文架構............................................................................................ 10
第二章 系統架構與設計................................................................................. 11
2.1 接收機架構........................................................................................ 11
2.1.1 低中頻接收機架構................................................................. 12
2.1.2 零中頻接收機架構................................................................. 15
2.1.3 雙次轉頻第二零中頻架構..................................................... 20
2.1.4 雙次轉頻第二零中頻架構之變革......................................... 21
2.2 接收機規格........................................................................................ 22
2.3 訊號振幅的控制策略........................................................................ 24
2.3.1 限幅放大器............................................................................. 24
2.3.2 自動增益控制......................................................................... 25
2.4 數位回授自動增益控制.................................................................... 28
2.4.1 增益控制放大器..................................................................... 29
2.4.2 一階近似迴路分析................................................................. 31
2.5 模擬結果............................................................................................ 32
第三章 濾波器的分析與設計......................................................................... 35
3.1 連續時間濾波器理論........................................................................ 35
3.2 濾波器頻率響應特性介紹................................................................ 37
3.2.1 Butterworth 頻率響應............................................................. 37
3.2.2 Chebyshev I 頻率響應............................................................ 39
3.2.3 Chebyshev II 頻率響應........................................................... 40
3.2.4 Elliptic 頻率響應..................................................................... 41
3.2.5 濾波器頻率響應的比較......................................................... 42
3.3 濾波器架構的分析與比較................................................................ 44
3.3.1 Sallen-Key 濾波器................................................................. 45
3.3.2 Leap-frog 濾波器................................................................... 47
3.3.3 Tow-Thomas 濾波器.............................................................. 50
3.4 綜合討論............................................................................................ 53
3.5 模擬結果............................................................................................ 54
第四章 可程式化增益濾波器之設計............................................................. 59
4.1 設計考量............................................................................................ 59
4.1.1 動態範圍................................................................................. 60
4.1.2 線性度..................................................................................... 61
4.1.3 閃爍雜訊................................................................................. 62
4.1.4 頻率補償技術......................................................................... 64
4.2 可程式化增益濾波器之電路實現.................................................... 66
4.2.1 重複使用電流的全差動運算放大器..................................... 67
4.2.2 共模回授電路......................................................................... 70
4.2.3 可變輸入電阻......................................................................... 72
4.2.4 輸出緩衝器............................................................................. 73
4.3 晶片佈局與模擬結果........................................................................ 74
4.3.1 佈局考量................................................................................. 74
4.3.2 模擬結果................................................................................. 76
4.4 綜合討論............................................................................................ 81
第五章 結論與未來展望................................................................................. 83
5.1 結論.................................................................................................... 83
5.2 未來展望............................................................................................ 84
參考文獻............................................................................................................. 85
附錄A 晶片腳位分配..................................................................................... 88
A.1 打線圖................................................................................................ 88
A.2 晶片腳位說明.................................................................................... 89參考文獻 [1] European Telecommunications Standards Inst. (ETSI), ETSI 300 744 (1997): Digital Broadcasting Systems for Television, Sound and Data Services; Framing Structure, Channel Coding and Modulation for Digital Terrestrial Television, 1997.
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