LDOCad – A Behavioral Model Generation Tool for an LDO Linear Regulator

Yong Gao, Chuanfeng Wei
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Abstract

Low drop-out (LDO) voltage regulators are widely used in many portable applications, such as cell phones, laptops, and earplugs. However, the design and simulation of the circuit takes a long time. Hence, the behavioral model for an LDO regulator is greatly needed. In this paper, the hybrid modeling method has been illustrated for generating a behavioral model for an LDO regulator circuit. The hybrid modeling method integrates a table-based modeling method and a circuit simplification method for generating an LDO linear regulator behavioral model. Based on research of the automation topologies and algorithms a behavioral model generation tool for an LDO linear regulator, LDOCad, is also described, including the software architecture and different modules of LDOCad. This tool provides the modeler, or circuit designer, with an approach to quickly and automatically generate a behavioral model for an LDO linear regulator. When the netlist processing algorithm, the table generation algorithm, and the modeled node and topology device extraction algorithm are executed, the hybrid model can be generated through the model topology formulator. The algorithms are generic and robust. The models tested demonstrate an accurate match with the performance of the original circuits and achieve from a 5 to 19 times speed improvement in simulations.
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LDOCad - LDO线性调节器的行为模型生成工具
低降差(LDO)稳压器广泛应用于许多便携式应用,如手机,笔记本电脑和耳塞。然而,电路的设计和仿真需要很长时间。因此,LDO调节器的行为模型是非常必要的。本文介绍了一种用于生成LDO稳压电路行为模型的混合建模方法。该混合建模方法集成了基于表的建模方法和电路简化方法,用于生成LDO线性调节器行为模型。在对LDO线性调节器的自动化拓扑和算法进行研究的基础上,介绍了LDOCad行为模型生成工具,包括LDOCad的软件结构和各模块。该工具为建模人员或电路设计人员提供了一种快速自动生成LDO线性稳压器行为模型的方法。当执行网表处理算法、表生成算法、建模节点和拓扑设备提取算法时,可通过模型拓扑制定器生成混合模型。该算法具有通用性和鲁棒性。经过测试的模型与原始电路的性能相匹配,并且在仿真中实现了5到19倍的速度提升。
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