2-1級聯(lián)架構sigma delta調(diào)制器的研究與設計
發(fā)布時間:2018-04-15 00:10
本文選題:級聯(lián)架構 + 調(diào)制器; 參考:《吉林大學》2015年碩士論文
【摘要】:進入二十一世紀以來,全球電子市場有了一個爆炸式的發(fā)展,而這個發(fā)展也為中國的電子行業(yè)尤其是半導體行業(yè)的發(fā)展帶來了機遇。其中模數(shù)轉換器成了熱門的研究方向。ADC吸引了人們的注意是有原因的,我們手持設備、電腦等處理的信號為數(shù)字信號,數(shù)字信號有著靈活性、穩(wěn)定性好的特點,而且其抗干擾能力強,在存儲以及信號傳輸過程中有著很大的優(yōu)勢。而我們所接觸的世界絕大部分信號為模擬信號,而所以ADC作為連接模擬世界與數(shù)字世界的橋梁,其作用是不言而喻的。對于ADC來說,由于其種類很多,所以我們可以根據(jù)不同的需求來選擇不同類型的ADC。對于在要求高精度的場所下通常采用sigma deltaADC,特別是其可以達成數(shù)據(jù)轉換與數(shù)字信號處理的完美結合,使其地位越來越高。 在本文我們根據(jù)指標的需求,進行了架構的選擇以及各種參數(shù)的選取,最后決定采用2-1級聯(lián)的架構,并且確定了各個設計參數(shù),而且利用了MATLAB的simulink模塊進行了驗證工作,顯示已經(jīng)達到了設計要求。在此基礎上我們討論了實際電路中遇到的非理想因素,這些為后面實際電路的設計提供了要求。我們根據(jù)調(diào)制器的主要電路參數(shù),設計了sigma delta調(diào)制器的各個子電路,包含了兩相不交疊時鐘電路、全差分運放以及比較器,并且搭建了調(diào)制器的整體電路,經(jīng)過仿真我們得到調(diào)制器的工作性能達到有效精度16.68bit,信噪比達到102.2dB。 在完成電路級設計之后,我們進行了版圖的繪制工作,我們采用的是chrt0.18μm CMOS工藝,我們對電路的各個模塊進行了版圖繪制,并且整體版圖通過了DRC以及LVS檢測。并且我們進行了流片。本文所設計的sigma delta調(diào)制器結構簡單,有效精度高,,動態(tài)范圍大,芯片占用面積小,具有現(xiàn)實意義。
[Abstract]:Since entering the twenty - first century , the global electronic market has an explosive development , which also brings opportunities for the development of the electronics industry , especially the semiconductor industry in China . The analog - to - digital converter has become a popular research direction . The ADC attracts people ' s attention . Because of the many kinds of digital signals , we can select different types of ADCs as a bridge connecting the analog world and the digital world . For the ADC , we can use the sigma delta ADC , especially it can achieve the perfect combination of the data conversion and the digital signal processing , so that the position of the ADC is higher and higher .
Based on the requirements of the index , the selection of the architecture and the selection of various parameters are carried out . Finally , we decide to adopt the 2 - 1 cascade architecture , and then determine the design parameters . Based on the main circuit parameters of the modulator , we design the various sub - circuits of the sigma delta modulator , which include two - phase non - overlapping clock circuit , all - differential operational amplifier and comparator , and set up the integrated circuit of the modulator . After simulation , we get the effective precision of 16.68bit and the signal - to - noise ratio of 102.2 dB .
After completing the circuit - level design , we made the layout drawing work , we adopted the CMOS technology of CMOS t0 . 18渭m , we adopted the layout drawing of each module of the circuit , and the whole layout adopted DRC and LVS detection . And we made the flow sheet . The sigma delta modulator designed in this paper has simple structure , high effective precision , large dynamic range , small occupied area of the chip and practical significance .
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN761
【參考文獻】
相關期刊論文 前1條
1 張昊;黃小偉;韓雁;張澤松;韓曉霞;王昊;梁國;;An 18-bit high performance audio ∑-△D/A converter[J];半導體學報;2010年07期
本文編號:1751634
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