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研究生:黃錫淳
研究生(外文):Hsi-Chun Huang
論文名稱:應用於直接降頻接收機之混頻器
論文名稱(外文):Mixer Design for Direct Conversion Receivers
指導教授:黃柏鈞黃柏鈞引用關係
指導教授(外文):Po-Chiun Huang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:74
中文關鍵詞:電流再利用混頻器直接降頻接收器本地震盪源倍頻之降頻技術
外文關鍵詞:Current-Reuse MixerDirect Conversion ReceiversDouble LO Frequency Technique
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隨著固態元件以及積體電路製程技術革命性的進步,已經帶領著無線通訊的世界進入一個嶄新的世代。然而,低成本、省電、高效能的傳收機是決定無線通訊產品成功與否的重要因素。對於高度整合來說,直接降頻架構即為一個可行性非常高的架構。不同於傳統的超外差接收機,需要一個至多個中頻處理。所以直接降頻架構操作於高速的電路可以減到最少,因此才能達到高度整合的目標。
在直接降頻架構中主要遭遇到的問題如下:由於元件不匹配以及自我混波的影響,導致在低頻帶產生偏移電壓,那將會使得後面的幾級飽和。除此之外,電晶體天生的低頻帶顫動雜訊,將會惡化降頻到低頻的信號。其他像大功率干擾源之間的相互調變,突波造成的振幅變化,都會使得直接降頻器的功能變差。
在這論文中,主要討論的是如何降低直接降頻接收機中混頻器的顫動雜訊。降低混頻器顫動雜訊的不同方法和混頻器雜訊公式的推導也在這篇論文中被詳細地討論。因為混頻器跟傳統的放大器不同,其為非線性電路,故讀者可以利用這些混頻器雜訊公式來直覺地設計混頻器。而且改版後的吉爾伯特混頻器也已經製成晶片並且量測的步驟也清楚地說明。製成晶片的混頻器採用的方法是電流再利用技術,解決了在直接降頻接收器中相當迫於需要解決的混頻器顫動雜訊的問題,顫動雜訊會影響到整個無線接收機的靈敏度,導致降到低頻的訊號可能被低頻電晶體先天極大的顫動雜訊給蓋掉。其中在量測晶片這一節中,很清楚地指出之所以以往會遇到的困難之所在,並且解決了大部分的問題。而尚未完全解決的部份,也有討論可以解決的方向。降低混頻器顫動雜訊的不同方法,包括有第三章中已經介紹過的電流再利用技術、本地震盪源倍頻之降頻技術,除頻諧波混頻器技術等等。不過不同的方法各有其優缺點。
最後期望在未來能夠整合整個無線傳收機系統的前端電路,並且能夠符合一些通訊標準。
The revolutionary advances in solid-states and VLSI technology have brought the world of wireless communications into a completely brand-new era. However, the success of the wireless communication products depends on the low cost, low power and high performance transceivers.
Direct conversion is a very promising architecture for high integration. Unlike conventional superheterodyne receiver, it constructs without applying any IF stage. Its minimum circuit blocks operated at high-speed enable the goal of highly integration.
The main problems in the direct conversion architecture are listed below. The effects due to devices mismatches and self-mixing result in DC offset at low frequency. And that will saturate the following stages. In addition, inherent MOS 1/f noise will deteriorate the downconverted signal at DC. In-band interrupts from high power interferences, and AM disturbance due to burst blockers will greatly degrade the system sensitivity.
In this thesis, the emphasis is primarily put on the solution of reducing flicker noise of the mixer for direct conversoin receiver. Different approaches of reducing flicker noise and the detailed noise derivation of mixer are discussed in this thesis. The modified Gilbert mixer has been implemented and steps of the measurement are described clearly.
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