發(fā)布時間：2018-01-09 22:10

  本文關(guān)鍵詞：高精度數(shù)字時間轉(zhuǎn)換技術(shù)的研究與實(shí)現(xiàn)　出處：《西安電子科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： FPGA 數(shù)字時間轉(zhuǎn)換器 時間間隔 可編程絕對延遲單元

【摘要】：隨著電子技術(shù)的發(fā)展與進(jìn)步,時間間隔的控制精度越來越高,已經(jīng)深入到皮秒甚至亞皮秒量級。數(shù)字時間轉(zhuǎn)換器(Digital-to-Time Converters,DTC)屬于一種時間間隔產(chǎn)生技術(shù),它不僅廣泛應(yīng)用于高能物理實(shí)驗(yàn)、天文測量等基礎(chǔ)研究領(lǐng)域,并且在航空航天、遙感定位、雷達(dá)、電子測量等應(yīng)用研究領(lǐng)域也是一項(xiàng)必不可少的重要技術(shù)。目前,高分辨率的DTC系統(tǒng)主要是利用AISC芯片實(shí)現(xiàn),但其具有靈活性低、開發(fā)周期長等缺點(diǎn)�；贔PGA實(shí)現(xiàn)DTC系統(tǒng)不僅具有高靈活性和高穩(wěn)定性,還可以縮短開發(fā)周期。但是,利用FPGA芯片實(shí)現(xiàn)的DTC系統(tǒng)分辨率不夠高,難以達(dá)到與ASIC相同的精度。因此,論文利用FPGA芯片實(shí)現(xiàn)高精度DTC系統(tǒng)具有重要的研究意義。論文首先對幾種傳統(tǒng)數(shù)字時間轉(zhuǎn)換器進(jìn)行研究,深入分析了不同DTC方法的優(yōu)缺點(diǎn),并進(jìn)行了對比研究。而后為了在FPGA芯片上實(shí)現(xiàn)高精度的數(shù)字時間轉(zhuǎn)換器,論文對直接計(jì)數(shù)法DTC和差分延遲法DTC進(jìn)行了改進(jìn),提出一種新的時間間隔產(chǎn)生實(shí)現(xiàn)方法,并在Xilinx Virtex-6系列FPGA芯片上,實(shí)現(xiàn)了具有高分辨率、寬動態(tài)范圍和高穩(wěn)定性的數(shù)字時間轉(zhuǎn)換器。DTC系統(tǒng)選擇Xilinx Virtex-6系列FPGA內(nèi)部集成的可編程絕對延遲單元作為差分延遲鏈的延遲單元,它不僅可以實(shí)現(xiàn)高精度的延遲,還使得DTC系統(tǒng)精度不受溫度和供電電壓的影響,極大增強(qiáng)了DTC系統(tǒng)的穩(wěn)定性。DTC系統(tǒng)研究實(shí)現(xiàn)時采用模塊化設(shè)計(jì),包括粗時間間隔產(chǎn)生模塊、細(xì)時間間隔產(chǎn)生模塊、數(shù)據(jù)處理模塊、軟件控制模塊和輸出控制模塊等,并分別對各個模塊進(jìn)行詳細(xì)研究設(shè)計(jì)。此外,論文還特別針對關(guān)鍵延遲時間進(jìn)行分析,通過手動調(diào)整布局布線,消除了因布線延遲對DTC系統(tǒng)精度的影響,以保證DTC系統(tǒng)分辨率達(dá)到設(shè)計(jì)要求。為了驗(yàn)證研究實(shí)現(xiàn)的DTC系統(tǒng)性能,論文搭建專門的測試平臺,對DTC系統(tǒng)進(jìn)行了仿真和實(shí)驗(yàn)測試。測試結(jié)果表明,該DTC系統(tǒng)的理論分辨率為1ps,微分非線性誤差為-0.17~0.13LSB,積分非線性誤差為-0.35~0.62LSB,其線性度達(dá)到理論要求。另外,論文還對系統(tǒng)的穩(wěn)定性進(jìn)行測試,驗(yàn)證了系統(tǒng)分辨率在10~60℃溫度范圍內(nèi)保持不變。因此,論文實(shí)現(xiàn)的DTC系統(tǒng)具有1ps的理論分辨率,并具備良好的線性度和穩(wěn)定度,有很好的實(shí)用價(jià)值。
[Abstract]:With the development and progress of electronic technology, the control precision of time interval is getting higher and higher. Digital time converter Digital-to-Time converters DTCs are part of a time-interval generation technology. It is not only widely used in high energy physics experiments, astronomical measurement and other basic research areas, but also in aerospace, remote sensing positioning, radar. At present, high resolution DTC system is mainly realized by AISC chip, but its flexibility is low. The DTC system based on FPGA not only has high flexibility and stability, but also can shorten the development cycle. The resolution of DTC system realized by FPGA chip is not high enough, so it is difficult to achieve the same precision as ASIC. In this paper, it is of great significance to use FPGA chip to realize high precision DTC system. Firstly, several traditional digital time converters are studied, and the advantages and disadvantages of different DTC methods are analyzed. In order to realize the high precision digital time converter on FPGA chip, the direct counting method DTC and differential delay method DTC are improved in this paper. A new method of time interval generation is proposed, and high resolution is realized on Xilinx Virtex-6 series FPGA chips. Wide dynamic range and high stability digital time converter. DTC system select Xilinx. The programmable absolute delay unit integrated within the Virtex-6 series FPGA is used as the delay unit of the differential delay chain. It can not only achieve high precision delay, but also make the accuracy of DTC system independent of temperature and power supply voltage, greatly enhance the stability of DTC system. It includes coarse time interval generation module, fine time interval generation module, data processing module, software control module and output control module. In this paper, the key delay time is analyzed, and the influence of routing delay on the precision of DTC system is eliminated by manually adjusting the layout and routing. In order to ensure the resolution of DTC system to meet the design requirements. In order to verify the performance of the DTC system, this paper built a special test platform. The DTC system is simulated and tested. The experimental results show that the theoretical resolution of the DTC system is 1 psand the differential nonlinear error is -0.17 / 0.13 LSB. The integral nonlinear error is -0.35 ~ 0.62 LSBs, and the linearity reaches the theoretical requirements. In addition, the stability of the system is tested. It is verified that the resolution of the system remains constant in the temperature range of 10 ~ 60 鈩，

本文編號：1402713