新型互補式金氧半高速類比數位轉換器之設計與分析

Abstract

在本論文中，一個新型八位元互補式金氧半高速類比數位轉換器被提出來 。此類比數位轉換器是以兩級(two-step)的架構來實現。此結構不需要用 到高增益或大輸出擺幅的操作放大器來設計。修正過的時間時序是用來改 善速度且八位元解析度仍然可藉由數位錯誤修正來達到。為了改善轉換速 率提昇到兩倍的速度，平行處理也被應用在兩個並聯連接的類比數位轉換 器。此線性誤差在二分之一最小有效位元之內。軟體的模擬結果顯示並聯 的類比數位轉換器的輸出率可有60百萬赫茲且有八位元解析度。 In this thesis, a new 8-bit CMOS A/D converter is proposed. The A/D converter is implemented by the two-step architecture. The structure can be designed without the need for the operational amplifiers with either high gain or a large output swing. The modified timing sequence is designed to improve the speed and the 8-bit resolution is achieved by using digital error correction. The parallel processing is also applied to the two A/D converters connected in parallel to improve the conversion rate up to 2 times speed. The linearity error is within □/2 LSB. The software simulation result shows the throughput rate can be 60MHz with 8-bit resolution for the parallel A/D converter.