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題 名 | High Order Oversampled Sigma-delta Modulator for IF Signal=可直接處理中頻訊號的高階超取樣積分三角調變器 |
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作 者 | 郭鐘榮; 劉嘉聰; 侯傑仁; 何前程; 郭泰豪; | 書刊名 | Journal of the Chinese Institute of Electrical Engineering |
卷 期 | 8:2 2001.05[民90.05] |
頁 次 | 頁133-142 |
分類號 | 448.5 |
關鍵詞 | 帶通型積分三角調變器; 順向積分三角調變器; Bandpass SDM; MASH; |
語 文 | 英文(English) |
中文摘要 | 用積分三角調變器的架構來作為高解析度的類比對數位轉手換器是一個極佳的選擇。而在近年來,若是想將中頻訊號直接地轉換成數位位元流,那麼就需要帶通型積分三角調變器來作處理。在本篇論文中,我們提出了一個以順向積分三角調變器的架構為基礎的新式帶通型積分三角調變器,並且將其取名為帶通型順向積分三角調變器。帶通型順向積分三角調變器的架構類似於原本的順向積分三角調變器的架構。帶通型順向積分三角調變器架構可以永遠維持在穩定狀態,因為其轉換函式中的全部極點皆為0。此外,因為我們所提出的新架構中的所有迴路係數皆為 1,所以此電路設計將很簡單且易於用超大型積體電路技術來實現硬體。另外,我們所提出的新架構也比其它的帶通型積分三角調變器有更好的效能表現。 帶通型順向積分三角調變器的行為模擬證明了它可以在輸入的中頻訊號為445 kHz的情況下達到17位元的高解析度。然而,因為類比電路設計與其硬體實現的高困難度,帶通型順向積分三角調變器的HSPICE後段模擬只能達到9位元的解析度,這個模擬結果與實際的晶片測試結果相符合。我們所提出的帶通型順向積分三角調變器也可以利用切換電容式積分器的技術來實現硬體且其運算功能正確。 |
英文摘要 | The sigma-delta modulator (SDM) is an excellent choice for high resolution analog to digital converters. Currently a bandpass SDM is needed if an IF signal is to be converted into a digital bit stream directly. In this paper, we propose a new bandpass SDM architecture based on MASH topology, called bandpass MASH. Similar to conventional MASH, bandpass MASH is always stable because all its poles are zeros. Further, since the loop coefficients of the proposed architecture are ones, the circuit is simple to design and easy to implement via VLSI technology. In addition, it also performs better than several other bandpass SDM's. Behavior simulation shows that the proposed bandpass MASH achieves 17-bit resolution for an IF signal at 455 kHz. However, due to difficulty in analog circuit design and implementation, the HSPICE post-simulation only shows 9-bit resolution that is compatible with the chip measurement results shown in [1]. The proposed bandpass MASH is also implemented using the switched capacitor technique and functions correctly. |
本系統中英文摘要資訊取自各篇刊載內容。