Symbolic Macromodeling for Statistical Simulation of Operational Amplifiers
Symbolic Macromodeling for Statistical Simulation of Operational Amplifiers
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DOI：
10.3969/j.issn.1674-862x.2013.03.006
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发表时间：
2013-09
影响因子：
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通讯作者：
Lan-Lan-Lan;Dong;Guo-yong;Shi;Jian-Dong;Cheng
中科院分区：
文献类型：
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作者：
Lan-Lan-Lan;Dong;Guo-yong;Shi;Jian-Dong;Cheng
传统上，符号电路仿真器用于模拟电路的小信号分析。建立了一种既适用于一般两级运算放大器小信号分析又适用于大信号分析的符号化行为宏建模方法。该方法建立了一个两极参数宏模型，其参数是由符号电路模拟器产生的电路元件参数的解析函数。在求解解析模型参数时采用了矩匹配技术。所建立的参数行为模型可用于运放的频域和时域性能仿真。特别是，这些参数模型非常适合运放在时间域中的快速统计模拟。实验结果表明，该模型所描述的运算放大器摆动和建立时间的统计分布与晶体管级的结果吻合较好，并且获得了显著的加速比。
Symbolic circuit simulator is traditionally applied to the small-signal analysis of analog circuits. This paper establishes a symbolic behavioral macro-modeling method applicable to both small-signal and large-signal analysis of general two-stage operational amplifiers (op-amps). The proposed method creates a two-pole parametric macromodel whose parameters are analytical functions of the circuit element parameters generated by a symbolic circuit simulator. A moment matching technique is used in deriving the analytical model parameter. The created parametric behavioral model can be used for op-amps performance simulation in both frequency and time domains. In particular, the parametric models are highly suited for fast statistical simulation of op-amps in the time-domain. Experiment results show that the statistical distributions of the op-amp slew and settling time characterized by the proposed model agree well with the transistor-level results in addition to achieving significant speedup.