一种折叠式共源共栅运算放大器的准确设计方法  

An Accurate Design Approach for the Folded Cascode Operational Amplifier

作　　者：王嘉奇 吕高崇 郭裕顺[1] WANG Jiaqi;Lü Gaochong;GUO Yushun(School of Electronics and Information Engineering,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018

出　　处：《电子科技》2023年第3期50-54,68,共6页Electronic Science and Technology

基　　金：国家自然科学基金(60672013)。

摘　　要：传统折叠式共源共栅放大器的人工设计流程只能得到近似的设计结果,优化方法获得的结果较好,但需耗费大量计算。文中针对这类放大器,给出了一种准确设计方法。通过SPICE仿真弥补传统设计流程各性能指标解析近似产生的误差,同时采用基于BSIM模型的器件尺寸计算,反复执行这一设计流程,消除了传统设计过程存在的误差,得到准确的设计结果。文中所提方法相较于传统人工方法更精确,避免了设计时的反复调试;与优化方法相比,虽仍要通过一个迭代过程,但因收敛较快,故计算量较小。文中以0.18μm与90 nm实际工艺库下的电路设计为例,给出了仿真设计结果,证明了所提方法的正确性与有效性。The results obtained from the traditional design procedure of the folded cascode amplifier are inaccurate. The optimization method can produce fairly accurate design results, but consumes large amount of computations. This study presents an accurate design method for this kind of amplifier. Through SPICE simulation, the errors caused by the analysis and approximation of various performance indicators in the traditional design process are compensated. At the same time, The device size calculation based on the BSIM model is adopted, and this design process is repeatedly executed, which gradually eliminates the errors existing in the traditional design process and obtains accurate design results. Compared with the traditional manual method, the proposed method is more accurate and avoids repeated debugging during design. When compared with the optimization method, although the proposed design still needs to go through an iterative process, the calculation amount is smaller due to the faster convergence. The circuit design under the actual process library of 0.18 μm and 90 nm is taken as an example, and the simulation experiments proves the correctness and effectiveness of the proposed method.

关 键 词：模拟IC设计 运算放大器 模拟设计自动化 电路优化设计 器件尺寸 BSIM模型 共源共栅放大器 迭代设计方法 

分 类 号：TN402[电子电信—微电子学与固体电子学]