高平坦度 低駐波 有線電視幹線放大器模組化之實作

傳統的CATV 放大器所包含的系統操作功能都直接設置在放大器平台本體上，無法因應地區規格不同，做功能的置換，如頻段切割的變換、前級信號來源強度修正、和前級信號來源斜率曲線的修正等等。對放大器製造商而言，如此的產品設計只能針對某一地區，規格相同，系統需求與產品功能一致的客戶為銷售對象，這些銷售對象是有限的。若要符合廣大的產品市場，要開發的機種會因地而異，造成備料零件繁雜多樣，並且少量。其結果使整個設計團隊開發量很高，造成供應鏈很大的管理壓力，製程成本就無法下降。對系統業者而言，如此的產品操作介面難度較高，購得的成本會因此昂貴，且會因輸出負載飽和就得增購放大器，系統維護費用高。為了提高信號的傳遞距離，降低添購放大器數量的成本，高增益兼具高品質的產品是目前市場的趨勢。且除了傳送傳統的電視節目外，系統業者也開始提供許多加值服務，如網路、多媒體、互動電視、電話和VOD，傳輸資料量如此的多元化且大，產品只有朝更高頻率發展的必要性，以解決使用頻道上壅塞的問題。故，設計一台高增益、高平坦度、低駐波、有線電視模組化的幹線放大器，將是本論文研究的目標。

關鍵字

放大器

並列摘要

In the past, all the functional blocks have been built directly on the main circuit board on traditional CATV amplifier. This fixed configuration causes some problems such as: not flexible for different band split country, not flexible for different band- width country, not flexible for signals adjustments!! The fixed configuration amp leads the headache to manufacturer and sales agent and so is the user!! For manufacturer, the fixed configuration amplifiers are made for certain customers requested the similar specs. The market size is limited! To meet It is very severe to both R&D load and logistics load, such as inventory management, materials preparation, lead time. At last the manufacturing cost and overhead can’t be effectively reduced!! For CATV system operator, the fixed configuration amplifier is difficult to use, high inventory cost, difficult to upgrade and lack the feature of future proof!! In order to improve the transmission distance of signals, to reduce operator’s cost,ａhigh gain and high-quality products is the trend of market now . Not limited to traditional TV program broadcasting, operators are doing the multiple value added service, such as internet service, multimedia, interactive TV, VOD and telephony. These services lead to data traffic congestion, then the strong need of wider bandwidth!! So, a high gain, ripple minimum, low VSWR, modularized CATV trunk amplifier has been my study target!!