https://scholars.lib.ntu.edu.tw/handle/123456789/173865
Title: | 射頻發射器(I) | Authors: | 呂學士 | Keywords: | 射頻;發射機;可變增益放大器;數位控制;對數線性;RF;transmitter;VGA;digital control;linear-in-dB | Issue Date: | 31-Jul-2005 | Publisher: | 臺北市:國立臺灣大學電子工程學研究所 | Abstract: | 一個包含正交調變器、可變增益放大器 與晶片上之輸出變壓器的5.8GHz 發射機前 端以CMOS 0.18-um 製程在本計畫中實現。 該正交調變器採用交差耦合式微混波器架 構,在輸入250mVpp 的信號下可達成32dB 的第三次項非線性抑制。利用4-bit 的控制單 位所設計出的16 階-對數線性-增益變化,可 達成總共27dB 的輸出動態範圍。單端型式輸 出則藉由一個晶片上之3:1 變壓器來完成, 而輸出匹配電路也因此被簡化。 A 5.8 GHz transmitter front-end comprising a quadrature modulator, a variable gain amplifier and an on-chip output balun in CMOS 0.18-um technology is presented. The quadrature modulator adopts cross-coupled type micro-mixer, and the measured 3rd-oder rejection is 32 dB under input voltage swing of 250 mVpp. With four-bit control words, a 16-step linear-in-dB output power is realized to achieve a dynamic range of 27 dB. A single-ended type output is accomplished by an on-chip 3:1 transformer and the output matching network is therefore simplified. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/20048 | Other Identifiers: | 932215E002028 | Rights: | 國立臺灣大學電子工程學研究所 |
Appears in Collections: | 電子工程學研究所 |
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932215E002028.pdf | 258.49 kB | Adobe PDF | View/Open |
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