應用於Wi-Fi無線傳輸模組之類比數位轉換器電路研究

近年來科技進步無線網路技術日漸成熟，行動裝置開始普及化，對於無線傳輸模組要求也與日俱增，而其中類比數位轉換器的速度與精準度便會決定無線傳輸模組的效能。本研究之目的為設計出應用於802.11n無線傳輸模組的類比數位轉換器。在經過許多資料收集與研究各種類型的類比數位轉換器後決定採用差動訊號的循續漸近式類比數位轉換器，此架構由自舉式開關、電容陣列、位移暫存器、SAR邏輯電路以及比較器組成，相較於採用多個比較器管線式類比數位轉換器會有較小的功耗，而差動輸入訊號相較於傳統單端訊號的有更高的準確度。本論文採用UMC Mixed-mode 0.18um 1P6M，設計出一個54MS/s、INL在-1.503~1.972、 DNL在-1~2.021、有效位元數為8.511的10bit類比數位轉換器，希望以此為基礎改良做出符合未來更高需求之電路。

關鍵字

行動裝置；無線傳輸模組；差動訊號；循續漸近式類比數位轉換器

並列摘要

With the advancement of technology in recent years, wireless network has matured and mobile devices have become popular. The requirements for wireless modules are also increasing. The speed and accuracy of analog to digital converters will determine the performance of wireless modules. The purpose of this study is to design an analog-to-digital converter for 802.11n wireless modules. After a lot of paper collection and research on various types of analog to digital converters. It was decided to use a differential signal progressive analog to digital converter. This architecture consists of bootstrapped switches, capacitor arrays, shifting registers, SAR logic circuits, and Comparator. Compared with the use of multiple comparator pipeline analog-to-digital converter will have less power consumption, and the differential input signal has a higher accuracy than the traditional single-ended signal. This paper uses UMC Mixed-mode 0.18um 1P6M to design a 10-bit ADC with 54MS/s, INL of -1.503~1.972, DNL of -1~2.021, and ENOB of 8.511. I hope this is the basis Improve the circuit to meet the higher demand in the future.