【作者】 张科；

【导师】 冯全源；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2006， 硕士

【摘要】 本论文设计的带隙基准电压源电路是LDO电源管理芯片的一个核心电路之一,带隙基准电路在DC-DC,A/D（模/数）,D/A（数/模）等集成电路中都有广泛的应用。LDO稳压器因其超低压差,以及成熟的生产工艺,低廉的生产成本,占据了稳压电路很大的市场,而且前景诱人,因而世界著名的半导体厂商无一不在研发和生产这类器件。目前,电源管理集成电路市场大部分被国外产品占据,研究开发国内的电源管理电路产品,能夺回巨大的市场。因此,开展本项目的研究具有特别重要的意义。本文所设计的电路一般应用于移动电话与无线通信设备、PDA、数码相机、携带型电池设备等。 本论文根据LDO稳压器的要求,设计了一种基于LDO的带隙基准电压源的电路,它采用0.5um,2P3M,BICMOS工艺。为了提高电压抑制性,采用了低压共源共栅的电流镜结构,并且在基准内部设计了一个运算放大器,合理的运放设计更进一步的提高了电源抑制性;在抑制温漂方面我们利用了V_BE的负温度系数和ΔV_BE的正温度系数,并使用了PTAT（proportional to absolute temperature,与绝对温度成正比）的方法对温度进行了一级补偿;在保护电路的安全方面本文设计了一个软启动电路,利用电容充电的原理使基准安全建立,并利用反馈的机理在基准建立后自动关断软启动模块。从而在保证基准安全建立的同时减小了静态电流,降低了功耗。 本文首先简要介绍了电源管理芯片的重要性及国内外发展现状,面临的问题;接着叙述了带隙基准里的关键基础理论,然后详细阐述了带隙基准电压源的基本原理,根据以上情况和原理我们设计了一种基于LDO带隙基准电压源的电路,并用HSPICE仿真软件对实际电路进行了仿真。结果表明,该电路具有较高的抑制温漂和电源电压的能力,启动电路也保证了核心电路的正常工作,其结构简单,具有低压低功耗的特点。更多还原

【Abstract】 Band-gap reference voltage circuit is one of the key circuits of power management chip .It applied for DC-DC, A/D converter, D/A converter in integrated circuit. Nowadays, foreign enterprises almost occupy the whole market of power management IC. it is necessary to dominate such a big market. Therefore, it is of great significance to research and develop domestic power management IC. Moreover, it is very important to study the LDO linear regulator circuit. The typical application of the chip includes the Mobile phones, Wireless communication equipment, PDA, portable AV equipment, Battery powered equipment.According to LDO linear regulator require, it designs a band-gap reference circuit in this paper. The chip is manufactured by 0.5um ,2P3M、 BICMOS process. For improving the power rejection, it adopts the low voltage cascode mirror structure, and designs the operation amplifier. In the other hand, it takes up a temperature compensate technology to improve temperature stability. The characteristic of this design is combination between soft start-up circuit and reference voltage circuit to assure the safe of establishing reference. By means of capacity charge principle, it designs the circuit which can cut off when reference voltage reached. So, it decreases the quiet current and the power consumption.In the first part, this paper introduces the background and significance of this research. In the second chapter, the basic of the key knowledge is narrated. And then, It is a detailed description about the band-gap reference voltage design .It has successfully designed an reference voltage .HSPICE simulation results which include temperature drift, PSRR (Power Supply Rejection Ration), quiet current, time sequence. Therefore, the results have shown the circuit has rejection of temperature drift and power supply. Soft startup circuit protects the core circuit. The circuit hold advantages of simply, low voltage and low consumption.更多还原