【作者】 唐圣学；

【导师】 何怡刚；

【作者基本信息】 湖南大学 ， 电气工程， 2008， 博士

【摘要】 随着集成工艺的不断提高、数字系统规模不断的增大,各种功能强大的片上系统(System-On-Chip,SOC)不断出现在人们的视野中,人们在对SOC处理性能上提出更高的要求时,也要求这种片上系统能直接处理模拟信号,即产生了混合信号片上系统(Mixed-Signal SOC, MSSOC)。以CMOS数字工艺技术实现模拟集成电路是现代大规模SOC研究中的热点和难点,结合过采样技术和噪声整形技术的Sigma-Delta调制方法是解决这种问题的一种有效手段。本文深入研究工作于过采样的Sigma-Delta调制器的原理和设计方法、位流信号直接处理算法、混合信号片上系统的结构和测试。提出了基于过采样技术的Sigma-Delta调制器的混合片上系统,位流信号直接处理结构和新的算法、A/D转换器的测试结构和算法理论。论文创新点及主要研究成果概括如下:(1)深入研究和建立了开关电容电路的Sigma-Delta调制器的Simulik行为级仿真模型。该模型在建模过程中考虑了各种非理想因素的影响,建模方便,仿真精度比较高,仿真速度快,并且能进行时域噪声仿真。(2)研究了3种高性能的Sigma-Delta调制器的实现结构和方法、针对每种调制器电路实现的不足提出了相应的补偿方法和措施。深入研究了高阶Sigma-Delta调制器的变结构分析理论和稳定性的条件,提出了离散变结构系统成为Sigma-Delta调制器的条件和稳定性的验证理论。(3)采用0.18um工艺实现了一个16位的Sigma-Delta A/D转换器,完成了电路设计、电路结构选择和版图设计,芯片的测试。(4)深入研究了位流信号直接处理的算法、结构和电路实现。提出了一种新的位流加法器、乘法器和由它们组成的基本电路模块及其应用。(5)阐述了表征ADC的性能参数和常用的测试方法。提出了基于FFT的谱分析和ADC模型估计的测试方法,实现利用低精度信号源测试高精度的A/D转换器的理论。提出了一种内自测试结构的MSSOC电路,深入研究了基于Sigma-Delta调制技术的内置高精度测试信号源的生成方法。本论文的研究达到了预期目标,发展了与CMOS工艺兼容的Sigma-Delta调制器的混合信号片上系统,上述研究成果为实现高精度的混合信号片上系统提供了基础理论和设计依据,具有重大的实践和理论意义。更多还原

【Abstract】 With digital system scales increase and integrated technology development, the powerful system-on-chip (SOC) has come into our life. When they are created to have high performaces, the SOCs are required the abiltity to process the analog signal directly, that is, the mixed-signal SOC ( MSSOC).Realizing the analog integrated circuits with the CMOS digital technology is the hot spot and difficulty in the investigation of the modern large scale SOC. The paper studied deeply the operational principle of Sigma-Delta modulator and its design method, the processing algorithm of bit stream signal, and the structure and test of mixed SOC. The paper proposes a novel mixed SOC based on Sigma-Delta modulator, a new bit-stream signal processing structure and algorithm, and the structure and algorithm to test high precision A/D convertors.The significant investigation results of the paper are as follow:(1) The behavior simulation model of switched-capacitor Sigma-Delta modulator circuits is investigated deeply and created in simulink. The Sigma-Delta modulator simulation has high precision and fast performance for the nonideal factors being added into the model.(2) We study the realizing structure and method of three high performance Sigma-Delta modulators and propose the corresponding measures and method to compensate their realizing lack in circuits. We investigate deeply the variable structure theory to analyze the high-order Sigma-Delta modulator and the stability condition and propose the condition on the discrete varibal structure system being the Sigma-Delta modulator and the theory to test stability.(3) We designed a 16-bit Sigma-Delta A/D convertor in 0.18um technology and implemented the circuit design, the circuit structure selecting and the layout design, and the chip test.(4) We study deeply the bit-stream processing directly algorithm, its structure and circuits realizaiotn. A novel bit stream adder is proposed in the paper and used to compose other modules such as the multiplier, and its application.(5) We introduce the ADC performance parameters and the usual test method. The method of combining FFT spectrum analysis and ADC model is proposed to test the high precision ADC with the low precision stimulus. A novel built-in-self-test SOC circuit is proposed in chapter VI and a high built-in precision stimulus is generated using the Sigma-Delta technology.We have obtained the anticipated goal in the paper and implemented the Sigma-Delta Modulator mixed signal SOC in the standard digital CMOS technology. The studied results achieved in the paper are of significance in theory and design method to apply the high precision mixed signal SOC.更多还原