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Title: | 應用於心跳偵測系統中寬頻收發機之降頻混頻器與相位移器之研製 Design of Broadband Down-converted Mixer and Switch Type Phase Shifter for Vital Sign Detector Applications |
Authors: | Huei-Wen Wang 王慧雯 |
Advisor: | 黃天偉(Tian-Wei Huang) |
Keyword: | 主動式平衡與不平衡轉換器,混頻器,轉阻放大器,相位移器, active balun,mixer,transimpedance amplifier,phase shifter, |
Publication Year : | 2015 |
Degree: | 碩士 |
Abstract: | 混頻器與相位儀器在射頻收發機中是占有重要角色的電路元件,在現今降頻的接收機架構中,具有寬頻的混頻器能夠應用於不同的頻帶,取代多顆電路所需的大面積與消耗功率的問題,而輸出的基頻訊號,再經由低頻的轉阻放大器處理訊號,除了作為低通濾波器濾掉高頻的本地震盪訊號外,亦能有足夠的輸出功率傳遞基頻訊號給後級來做處理;同時在現今偵測系統需求越來越高的情形下,相位移器也是一個設計的議題,多位元的相位移器能夠提供更高的解析度以供相位陣列使用,並且能讓天線的主波束指向更準確的方向,提高SNR.本篇論文藉由互補式金氧半導體的製程,提出應用於心跳偵測系統中寬頻收發機之降頻混頻器與相位移器之研製。
在第二章中提出了一個適用於2-30GHz寬頻的鏡像抑制混波器。藉由兩種不同形式的寬頻主動式平衡與不平衡的轉換器取代傳統較窄頻的馬遜平衡與不平衡轉換器,再與被動的環形混頻器做結合,產生寬頻的混頻效果,同時還能保有不錯的線性度以及直流功率消耗。在第三章中,利用一顆K-band三級疊接式混頻器來產生基頻的訊號,再經由轉阻放大器,能夠在小面積低功耗的情況下有效提高轉換增益與寬頻的輸出訊號,並且在第四章中,提出一顆電晶體切換模式來產生五位元的相位移器,低頻的操作頻帶下,利用微帶線能夠彎折的特性取代電感能有效的縮小面積,並在最後提出一組較準確的模擬方式避免相位誤差. Mixer and phase shifter are important circuit components in radio frequency transceivers. Broadband down-converted mixer can be applied to muti-band and solve the problem of large chip area and extra power. The output baseband signal can be enlarged by a transimpedance amplifier which can both filter the high local oscillation frequency and transfer the high output voltage to the analog to digital converter. As the growing demands for wireless communication, phase array technique is another design issue. Muti-bit phase shifter can provide high resolution for phase array and make the antenna direct precisely. By use of the complementary metal oxide semiconductor manufacturing process, a broadband down mixer for vital sign detect application and K band down mixer with TIA and 5-bit phase shifter are proposed.In chapterⅡ, a broadband mixer for vital sign application is proposed. Replace the narrow band passive marchand balun, two built-in broadband active baluns are utilized to provide differential signal. Combined with the passive ring mixer can produce a broadband down-converted mixer while maintaining well linearity and lower power consumption. In chapterⅢ, a K band triple cascaode mixer with transimpedance amplifier (TIA) can enlarge the baseband signal. The total power consumption can be reduced due to the modified bias at triple cascode mixer. The current mirror topology TIA can maintain the bandwidth and high gain with shunt feedback. In Chapter Ⅳ, a digitally-controlled switch type phase shifter is applied in X band phase array with resolution of 11.25 degree. Replace the inductor with transmission line, the chip size can be smaller and more compact. And for precise simulation, the PEX extraction is used in consideration of layout parasitic resistance and conductance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52360 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電信工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-104-1.pdf Restricted Access | 8.39 MB | Adobe PDF |
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