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Title: | 軟體無線電發射機與雙頻帶功率放大器設計 The Design of Software-defined Radio Transmitter and Dual-band Power Amplifier |
Authors: | Ting-Yun Huang 黃婷筠 |
Advisor: | 曹恆偉 |
Keyword: | 信號雜訊比值,軟體無線電,系統單晶片,功率放大器,信號頻寬,全球漫遊,矽製程, System-on-chip,software-defined radio,Cartesian transmitter,polar transmitter,radio frequency digital to analog converter, |
Publication Year : | 2010 |
Degree: | 碩士 |
Abstract: | 由於近期對於無線傳輸速率的要求越來越高,調變方式日益複雜,從傳統的FSK、PSK 進展到16QAM、64QAM 等等,以求在有限的頻寬中得到更高的傳輸效率。但在提高速度同時,這些調變對於信號雜訊比值的要求也更高,電路設計更加複雜。因目前全球已存在多種高、中、低階無線通信標準的現實以及未來極有可能出現的高規格之系統考量,「軟體無線電(Software-defined Radio, SDR )」的功能可用來解決系統間互不相容的困難,並減少更換新裝備所造成的浪費及環保問題。
現有多功能的消費性無線通信產品,其電路部分仍是使用基於單一或少數標準設計的IP 或模組加以整合而成。在量產狀況下成本與性能雖尚可接受,但仍甚難達致「全球漫遊」的理想,更無法相容於未來更高性能的新系統(WiMAX、4G…)。 綜上所述之事實,軟體無線電系統的硬體整合程度,仍須大幅提昇,以便降低成本、縮小佔有空間/重量、並降低功率消耗、以便滿足廣大資通消費/服務市場上的需求。本論文將研究探討最適合軟體無線電系統使用之發射機架構,並設計製作其中最具關鍵性的電路晶片。 本論文之重點將著重於提供一軟體無線電發射機之解決方案,並期望可以系統單晶片的形式實現,且為了增加此發射機與數位電路之整合性,在製程上的選擇上則是完全以矽製程來考量。 內文主要分為兩部分,前半部主要介紹軟體無線電發射機中將基頻信號轉換至射頻段之電路及其改良方式,而後半段則是說明如何設計一個適用於多系統之功率放大器,以藉此減少行動通訊裝置之體積。 Because of the skyrocketed popularity of mobile communication device, more and more communication standards are introduced, making engineers busy designing equipments applied to distinct standards. Many researchers have devoted to the area of system-on-chip(SoC) and software-defined radio anticipating a appreciate solution to reduce the chip area as well as absorb most of components into a single device. In this thesis, the feature of traditional Cartesian and polar transmitter are discussed. For the application of software-defined radio, the Cartesian transmitter using radio frequency digital to analog converter(RFDAC) has higher power efficiency than those using DAC and mixer. And it can drive the RF power amplifier directly with the maximum output power of -2dBm. Besides, two methods, dual-band output matching and impendence switching, are proposed to design a dual- band power amplifier. The dual-band PA demonstrates gain of 15dB at 2.45GHz and 14dB at 5.2GHz. In application, multi-standard device using dual-band PA can utilize chip area more efficiently. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47263 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電子工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-99-1.pdf Restricted Access | 10.74 MB | Adobe PDF |
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