本科论文（设计）LDO稳压器的电路及版图设计.docVIP

PAGE \* MERGEFORMAT IVLDO稳压器的电路及版图设计摘 要随着信息科学的飞速发展，电源IC技术已经变得越来越重要。在众多的电源技术中，由于低压差线性稳压器(LDO)的体积小、电源抑制比高、功耗小、噪声低及其应用端的电路简单等优点在众多电源IC中，人们的关注度非常普遍。另外，由于LDO还具备比较好的负载瞬态响应与线性瞬态响应，这些优点使它在各个领域占有非常重要的地位，比如在MP3播放器、无线电话、PDA等电子设备中被广泛应用。因此，当前电源IC技术领域的研究热点为线性稳压器的设计，具有重要的理论意义和实际应用价值。文中详细的对LDO线性稳压器的整体电路结构及其工作原理作了简单介绍，并给出了各个主要子模块电路的设计。另外，保证芯片在正常工作时能够安全，还对限流保护电路和过温保护电路进行了设计。LDO线性稳压器在设计时的一个很大的难点就是整个系统的稳定性问题，本设计也不例外。本文的仿真结果均采用Cadence-Spectre仿真工具来完成的，并且本文的版图也是利用Cadence完成的。在实现匹配过程中，集成电路版图设计是一个非常重要的环节。一个优秀的版图就可以大大提升一个设计。关键词：线性稳压器，瞬态响应，稳定性，版图设计大连东软信息学院毕业设计（论文） AbstractLDO Regulator Circuit and Layout Design AbstractWith the rapid development of information science, power IC technology has become increasingly important. Among the many power technology, due to low dropout linear regulator (LDO) small size, power supply rejection ratio, low power consumption, low noise and its applications side simple circuit in the power supply IC in many people’s attention very common. In addition, due to the LDO also has better load transient response with a linear transient response, these advantages in that it occupies a very important position in various fields, such as MP3 players, wireless phones, PDA and other electronic devices are widely used. Therefore, the current research focus power IC technologies for the linear regulator design has important theoretical and practical value.In detail on the overall LDO linear regulator circuit structure and its working principle is briefly introduced, and the design of each major sub-modules of the circuit. In addition, to ensure that the chip can be safe in normal operation, but also to limit protection circuit and over-temperature protection circuit design. In the design of a great difficulty LDO linear regulator is the stability of the whole system, this design is no exception.The simulation results in this paper are used Cadence-Spectre simulation tools to complete, and the