带宽门限时基的电源监控芯片的设计-软件工程(集成电路设计方向)专业论文.docx

华 华 中 科 技 大 学 硕 士 学 位 论 文 I I 摘 要 现代科技领域对电子产品的要求越来越高，微处理器（如单片机、DSP）系统的 稳定性和抗干扰能力是电子工程师面临的一大难题，监控技术就是解决这一难题的有 效手段之一。使用监控 IC 已成为当今的设计潮流，因为它大大减少了系统电路的复 杂性和元器件数量，并可以提高系统可靠性和精确度。现在的监控 IC 向着多功能系 统级发展，从早期仅有的电压监测，发展到后来看门狗、数据保护、电池切换等功能 也归入监控电路，广泛应用于计算机 、工业控制、通信、家用电器、仪器仪表等领 域。 本课题的目的就是设计一款多功能、低成本、低功耗微处理器电源监控电路芯片。 它集成了基准带隙电压源、电压比较器、时基振荡、看门狗等模块，整合了掉电保护、 上电复位、看门狗定时、芯片使能等多个功能，能够监控电源电压、电池故障和微处 理器或微控制器的工作状态。为了降低芯片的成本和功耗，采用了 BICMOS 的制造工 艺。 设计中我们采用了一种宽门限时基的振荡器模块，提供了较准确的时基，同时也 提供了外部振荡源端口，适用于不同的微处理器系统中。使用的设计工具是 IC 设计 平台 Virtuoso、仿真工具 Spectre 和验证工具 Diva。 本芯片设计基于 XFAB 的 0.6μmBiCMOS 工艺。对仿真结果的分析表明，本文设计 的电源监控电路芯片完全符合设计要求，降低了成本，提高了芯片的性能，达到了设 计目的。 关键词: 电源监控芯片;带隙基准电压源;比较器;时基振荡; 看门狗; II II ABSTRACT With the increasing requirement of electronic products in the modern science and technology, more and more challenges such as anti-jamming and stability in the microprocessor are brought to electronic engineers. Supervisory technology is one effective way to settle these problems. Voltage monitoring, supervisory integrated circuits are very popular in the designs, in that they cannot only reduce the design complexity and the number of components, but improve system reliability and accuracy significantly, compared to separate ICs and discrete components. Modern supervisory ICs have the characteristic of multifunction, which allows many functions besides voltage monitoring such as watch dog timing, data protection, battery switching and chip enable. For all these advantages, supervisory ICs have been applied in many fields, including computers, critical μP power monitoring and intelligent instruments. In this thesis, a multifunctional, low-cost, low-consume μP supervisory circuits chip was designed. In this design, the band gap, voltage difference, oscillator and watch dog timer modules were integrated and many functions including power-on reset, watch dogtiming, manual-reset and power-down protection were realized. To reduce the consume and cost, the CMOS process was adopted. During the design, we de