工作點(diǎn)驅(qū)動(dòng)的模擬集成電路優(yōu)化設(shè)計(jì)方法研究
[Abstract]:With the continuous development of integrated circuits, it has come to the era of system chips and mixed signal system chips, and the design of analog integrated circuits is still the main factor that restricts the efficiency of circuit design. The task of improving the level of automation design is urgent. Optimal design is an inevitable measure to realize the automation of analog circuit design. The design variables of traditional optimization design are all the dimensions of each device in the circuit, and the method based on the working point drive is to take a group of independent device voltage and current on the DC operating point of the circuit as the design variables. This method derives from the analogy to the manual design process. By changing the design space of the circuit, it is easy to express the constraints on the working region of the circuit (i.e., the constraint equation), and to make the mapping relationship between the design variables and the design objective (i.e., the objective function) more simple. It is advantageous to the convergence of the optimization algorithm. At the same time, because it is closer to the traditional manual design, the designer can understand the design process and the design result better, and it also provides the possibility for the optimization process to combine with the traditional design experience. To realize the optimization of working point drive, the most important problem to be solved is how to obtain the device size and various electrical parameters from the working point voltage and current of the device. The simple square law model can not meet the precision requirement for the small size MOS process design at present. This paper proposes a fuzzy logic modeling method to accomplish this task. First, a set of sample data is obtained by using the high precision MOS model built into the circuit simulator such as HSpice. Then the T-S fuzzy logic system is used to establish the model of the relationship between the device size and the operating point voltage and current. The T-S simulation logic system has the advantages of strong adaptability, almost no need of iteration, and is easy to be applied. Based on the above work, the multi-objective optimization design of MOS circuit based on genetic algorithm is studied. The Pareto frontier solution obtained by multi-objective optimization allows the designer to make the best choice from a set of conflicting design indexes, which is the fundamental way to solve the optimal circuit design. However, the multi-objective optimization based on NSGA-II genetic algorithm requires a lot of computation, especially when the circuit simulator is called to calculate the circuit performance index. The BSIM3v3 numerical model of a single transistor with small signal parameters is established first, and then the method based on equation optimization is carried out. Thus, the more accurate multi-objective optimal solution can be obtained quickly, and the computational complexity is greatly reduced. Finally, two common CMOS operational amplifier circuits are optimized and the effectiveness of the proposed method is proved.
【學(xué)位授予單位】:杭州電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TN402
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