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標題: | 應用於車用雷達之互補式金氧半場效電晶體功率放大器設計 Design of CMOS Power Amplifier for Automotive Radar Sensors |
作者: | Kun-Yin Wang 王崑印 |
指導教授: | 汪重光(Chorng-Kuang Wang) |
關鍵字: | 功率放大器,功率結合器,毫米波,不匹配,W頻帶,金氧半場效電晶體,車用雷達, Power amplifier (PA),power combiner,mm-wave (MMW),mismatch,W-band,CMOS,automotive radar, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 得益於製程逐年進步,使用低成本 CMOS 製作的毫米波電路系統成為一個備
受關注的研究領域;而位於77-81GHz 頻段的短距離車用雷達為其中的一部分。但 是毫米波較短的波長會造成傳輸路徑損失大幅上升,進而造成可偵測距離縮短。 同時,先進CMOS 製程的崩潰電壓較低,使得傳送機的輸出功率有所限制。若使 用高增益的天線來增加可偵測距離,則需要一個比晶片大許多的空間並且增加成 本。本論文將會提出一個有效率的功率結合方式藉此增加功率放大器的最高輸出 功率,進而使系統的可偵測距離更加延伸。 論文內將會先探討雷達系統對於前端電路的規格要求,從中了解電路設計的 限制。接著,提出一個操作在79GHz 附近頻段的功率放大器來降低接收機所需要 的敏感度與天線的增益。此功率放大器在77GHz 到81GHz 範圍內可以提供大於 19dBm 的輸出功率,同時有將近19%的功率附加效率,並且使得整合晶片天線的 可行性大為增加。 論文最後對於量測的結果再次進行系統方面的討論,用以提供規劃雷達系統 時,在傳送機方面能有更深入的資訊。 Owing to the progress in technology, the realization of millimeter-wave systems using low-cost CMOS process has become a research area in great demand. Short-range automotive radar for which the 77-81GHz band has been allocated is one of the parts. However, the short wave length of the signal suffers from the great attenuation of the transmission path and thus the decrease in the detectable range. At the meanwhile, the low breakdown voltage in advanced CMOS technology further hinders the output power of transmitters. High-gain antennas have been used to extend the maximum detectable range but with a higher cost and a volume much greater than a single chip. This thesis will present a power combining scheme that provides an efficient way to collect the signal from transistors and increase the maximum output power. First, the discussion for the requirement of the front-end circuits in radar system will be conducted to perceive the design constraint. Then a 1 V 79GHz power amplifier incorporating a mismatch-reduced power combiner is proposed to relief the requirement for the sensitivity of receivers and the gain of antennas. With the power amplifier having saturated output power of more than 19dBm around the 77-81GHz band and peak PAE larger than 19%, the integration of on-chip antenna to be a single chip system could be a realizable solution. Also, the measured performance will be discussed to provide an insight into the selection between two basic radar schemes from the view of transmitters in the end. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65536 |
全文授權: | 有償授權 |
顯示於系所單位: | 電子工程學研究所 |
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ntu-101-1.pdf 目前未授權公開取用 | 6.87 MB | Adobe PDF |
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