Symbolic Macromodeling for Statistical Simulation of Operational Amplifiers |
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Authors: | Lan-Lan Dong Guo-Yong Shi Jian-Dong Cheng |
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Affiliation: | 1.EDA Research Lab,School of Microelectronics,Shanghai Jiao Tong University,Shanghai 200240,China |
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Abstract: | 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. |
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Keywords: | Analog behavioral model large-signal analysis moment matching operational amplifiers process variation statistical analysis symbolic analysis |
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