对电磁干扰不敏感的电流镜电路设计-集成电路工程专业论文.docx

摘 摘 要 I I 摘 要 随着科技发展，模拟集成电路信号处理已经进入高速度、低功耗、高集成度阶段。 因为沟道面积的不断减少、信号频率的不断增加，所以集成电路对电磁干扰的敏感度不 断增强。电流镜作为电流模式电路中的核心模块之一，提高电流镜的抗电磁干扰能力对 电流模式电路有着重要意义。 本文从基本电流镜的原理入手，对 Wilson 电流镜、改进型 Wilson 电流镜、共源共 栅电流镜以及低压共源共栅电流镜进行了分析与总结。选择低压共源共栅电流镜作为电 路设计的基本电路来提高电路的输出电阻、增加输出电流的精度、降低电路的工作电压。 在电流镜抗电磁干扰措施研究中，本文主要分析了栅极滤波电流镜、低通滤波电流 镜、遗传演化电流镜和直流反馈电流镜。通过对电路进行仿真，分析各种抗电磁干扰措 施的能力以及需要改进的问题。 随后在低压共源共栅电流镜的基础上，利用低通滤波器、源级跟随器以及输入级滤 波电容等结构，提出了一种新型对电磁干扰不敏感的电流镜拓扑结构，并且对新型电流 镜进行了全集成化设计。 通过与直流反馈电流镜进行仿真对比，结果表明新型电流镜提高了抗电磁干扰能 力。 关键词 电流镜 电磁干扰 全集成设计 Abstract Abstract II II Abstract With the development of science and technology,analog integrated circuit signal processing has entered the high speed,low power, high integration stage.With the channel area declining,the signal frequency increasing,the integrated circuit to increase the sensitivity of electromagnetic interference,electromagnetic interference has become an important factor restricting the development of integrated circuit.Current mirror is one of the core module of current mode circuits,a wide range of applications,so as to improve the ability of anti electromagnetic interference current mirror has an important significance to the development of current mode circuits. According to the principle of basic current mirror,the Wilson current mirror,the improved Wilson current mirror,cascode current mirror and low-voltage cascode current mirror have been analyzed and summarized.Low voltage cascode current mirror as the basic circuit design to improve the output resistance, the precision of the output current have been improved. Using low pass filter, source follower and the input filter capacitor structure based on the low-voltage cascode current mirror.A kind of model with sensitiveless to EMI is presented and implemented in the paper. Simulation is carried out by comparison with DC feedback current mirror,The results show that the new current mirror presented in this paper has good proporties by comparison the current mirror in [18]. Keywords current mirror