高电源抑制比带隙基准电压源设计

发布时间：2018-10-21 18:48

【摘要】：当温度或者电源电压VDD发生变化时,带隙基准电压源的输出电压几乎不发生变化。这一优良的性能使带隙基准在很多电路模块中发挥着重要的作用。随着模拟集成电路的发展,如何设计出高性能的带隙基准受到了越来越多模拟工程师和学者的青睐。正是在这一背景下,本论文对高电源抑制比带隙基准电压源进行了研究。本文首先调研了带隙基准研究的意义和国内外在该方面的研究热点。然后分析了正负温度系数产生的基本原理、推导了带隙基准的环路增益以及确保环路稳定的条件、探讨了放大器失调电压对带隙基准输出电压精度产生的影响。本文所设计的带隙基准有三大特色:低输出电压、高电源抑制比和低温度漂移系数。该款带隙基准主要由四个不同的部分组成,分别是带隙基准的核心电路、放大器、预调节电路、启动电路。本论文对电路每部分的工作原理都进行分析并进行了数学推导,通过软件仿真的结果与要求指标进行对比。电路设计的难点在于预调节电路的设计以及如何保证电路在各个工艺角下依然满足指标的要求。本论文采用了电流求和模式的办法来达到输出为低压的目的,预调节电压的方法提高电源抑制比,并进行一定的温度补偿。通过对电路进行仿真发现:当VDD=3.3V,工艺角也不相同,仿真结果满足设计要求。以tt工艺角为例:输出为0.8V;电源抑制比是108.36d B@100Hz,72.33d B@10k Hz;温度漂移系数是2.65ppm/°C,响应时间是5.9μs。仿真结果满足设计要求。
[Abstract]:When the temperature or the supply voltage VDD changes, the output voltage of the bandgap voltage reference source is almost unchanged. This excellent performance makes bandgap reference play an important role in many circuit modules. With the development of analog integrated circuits, more and more analog engineers and scholars favor how to design high performance bandgap reference. Under this background, the high power rejection ratio bandgap voltage reference is studied in this paper. In this paper, the significance of bandgap reference research and the research focus at home and abroad are investigated. Then, the principle of positive and negative temperature coefficient is analyzed, the loop gain of bandgap reference and the condition of ensuring loop stability are deduced, and the influence of amplifier offset voltage on the output voltage precision of bandgap reference is discussed. The bandgap reference designed in this paper has three characteristics: low output voltage, high power supply rejection ratio and low temperature drift coefficient. The bandgap reference consists of four different parts, which are the core circuit of bandgap reference, amplifier, preregulation circuit and startup circuit. In this paper, the working principle of each part of the circuit is analyzed and the mathematical derivation is carried out, and the results of software simulation are compared with the requirements. The difficulty of circuit design lies in the design of preregulation circuit and how to ensure that the circuit still meets the requirements of each process angle. In this paper, the current summation mode is adopted to achieve the purpose of low voltage output. The voltage pre-regulation method improves the power supply rejection ratio and carries out certain temperature compensation. Through the simulation of the circuit, it is found that when the VDD=3.3V, process angle is also different, the simulation results meet the design requirements. Take the tt process angle as an example, the output is 0.8V, the power suppression ratio is 108.36d B@ 100HzN, the temperature drift coefficient of 10k Hz; is 2.65ppm/ 掳C, and the response time is 5.9 渭 s. The simulation results meet the design requirements.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN432

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