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標題: | 限制振幅導管式類比數位轉換器 A Limiting Swing Pipelined Analog to Digital Converter |
作者: | Cheng-Wei Tung 董鈞瑋 |
指導教授: | 曹恆偉(Hen-Wai Tsao) |
關鍵字: | 類比數位轉換器,快閃式類比數位轉換器,導管式類比數位轉換器,限制振幅輸入級, Analog to digital converters,flash A/D converter,pipelined A/D converter,limiting swing input stage, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 類比數位轉換器是連接真實世界與離散運算領域的關鍵元件, 在許多種類的轉換器架構中, 快閃式類比數位轉換器是目前速度最快的一種, 然而在高解析度的需求下,晶片面積與功率消耗必須增加。因此, 在這些考量之下, 導管式類比數位轉換器被證實更適合發展在快速及高解析度的應用。但是, 導管式類比數位轉換器的準確性與
轉換速度仍受限於內部電路、元件之非理想因素,例如運算放大器的非線性程度與有限頻寬等等。在本論文中提出以限制振幅輸入級取代傳統取樣保持電路,利用其轉換特性,搭配上原本之數位錯誤修正電路,使每級電路中之運算放大器操作於低振幅區間,等效增加取樣頻率,並且避免了運算放大器在高振幅非線性操作所產生的準確性 誤差。此導管式類比數位轉換器使用台灣積體電路標準0.35微米互補式金氧半製程實現, 電路的面積為6.2平方毫米。在取樣頻率80 MHz 時, 量測之SNDR 及SFDR的效能分別是33.25 dB及53.60 dB。功率消耗在3.3伏特供應電壓下為250mW。 Analog to digital converters (A/D Converters) provide the link between the analog world and digital system . In different architectures, flash A/D converter employs parallelism sampling to achive a high conversion speed, but it suffers from large power and area . In the requirement of high resolution, the pipelined architecture is more suitable . However, the accuracy of a pipelined A/D converter is susceptible to the imperfections of circuits and devices, such as non-linearity and bandwidth limitation . In this dissertation, replacing traditional sample and hold stages with limiting swing input stages in the pipelined A/D converter is proposed . According to the characteristic transfer curve of the limiting swing input stages, the outputs of every pipelined stages are limited in a lower swing region to increase sampling rate and decrease the non-linear effects of the amplifiers which may operate in high swing region . The A/D converter which was fabricated in the TSMC0.35-μm2P4M CMOS technology . Operating at a 80MS/s sampling rate, the A/D converter achieves SNDR and SFDR of 33.25 dB and 53.60 dB . The chip occupies an area of 6.2 mm2 , and the powre consumption is 250mW with a single 3.3 V supply . |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/25880 |
全文授權: | 未授權 |
顯示於系所單位: | 電子工程學研究所 |
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