低温漂低压带隙基准

论文总字数：31989字

摘 要

随着工业与社会经济的发展，穿戴式、便携式等低功耗应用的需求不断增加，电子产品的升级优化的速度越来越快，软件的不断升级也对电子产品的硬件水平提出了更高的要求。为了能在各种条件下的电子产品能够顺畅运行，满足人们各种需求，人们对电子产品性能的要求越来越高，基准源是其中很重要的一个部分。在一些对精度要求高的应用中，需要较为平稳的电压输出；在一些对温度范围要求比较宽的应用中，如智能功率芯片（SPC）等，高精度也很重要。本文对基准源的温度系数和电源电压抑制比进行了改善，能性能较高的系统的需要。

本文研究了基准源理论，分析了基准源的温度特性，设计了一种基准源。本文的基准源采用了曲率补偿法进行温度补偿，在一定程度上改善了原本一阶电路的温度系数。本文也设计了一种启动电路，在电路开始工作时对核心电路和偏置电路进行启动，防止电路工作于其他无效状态，并且启动电路在整个电路正常工作之后就会断开，对核心电路没有后续影响。

本文使用Cadence平台进行了对带隙基准电压源的电路设计，随后采用了CSMC的0.35umCMOS工艺对电路进行了有关工艺、温度的仿真验证以及调整优化。本文设计的低温漂低压基准电压源，电路具有二阶以上补偿措施，-55~ 125摄氏度的全温区内仿真精度达到60ppm以内，低频下的电源电压抑制比达到50dBc以上，电源电压为3.3V，输出基准电压小于1V，整体基准电压源的电路静态功耗低于1mV，基本达到了初始设计目标。

关键词：带隙基准电压源，温度系数，电源电压抑制

Abstract

With the development of industry and social economy, wearable, portable and other low-power applications are in increasing demand. The upgrading and optimization of electronic products are getting faster and faster, and the continuous upgrading of software also puts forward higher requirements on the hardware level of electronic products. In order to make electronic products run smoothly under various conditions and meet various needs of people, people have increasingly high requirements on the performance of electronic products. The reference source is a very important part of it. In some applications with high precision requirements, relatively stable voltage output is required. High accuracy is also important in applications that require a wide temperature range, such as intelligent power chips (SPC).

This paper studies the theory of reference source, analyzes the temperature characteristics of reference source, and designs a reference source. The curvature compensation method is used to compensate the temperature of the reference source in this paper, which improves the temperature coefficient of the original first-order circuit to some extent. This paper also designs a starting circuit, which starts the core circuit and bias circuit when the circuit starts to work, to prevent the circuit from working in other invalid states, and the starting circuit will be disconnected after the whole circuit works normally, with no subsequent impact on the core circuit.

This paper USES Cadence platform to design the circuit of bandgap reference voltage source, and then adopts 0.35umCMOS technology of CSMC to carry out simulation verification and adjustment and optimization of the process and temperature of the circuit. In this paper, 55 ~ 125 degrees Celsius temperature zone simulation accuracy is within 60 PPM, under the low frequency of the power supply voltage suppression ratio reaches more than 50 DBC, power supply voltage of 3.3 V, output reference voltage is less than 1 V, the voltage reference source circuit static power consumption is lower than 1 mv, basic achieved initial design goals.

KEY WORDS: bandgap reference voltage source, temperature coefficient, power supply voltage suppression

目 录

摘要 …………………………………………………………………………………………Ⅰ

Abstract ……………………………………………………………………………………Ⅱ

第一章 绪论 …………………………………………………………………………………1

1.1 课题研究背景和意义 …………………………………………………………………1

1.2 国内外研究现状与趋势 ………………………………………………………………2

1.2.1国内外研究现状 …………………………………………………………………2

1.2.2国内外研究趋势 …………………………………………………………………3

1.3论文的工作目标和论文结构 …………………………………………………………4

1.3.1论文的工作目标 …………………………………………………………………4

1.3.2论文结构 …………………………………………………………………………5

第二章 带隙基准电压源 ………………………………………………………………………6

2.1经典基准电压源 ………………………………………………………………………6

2.1.1电阻分压式基准源 ………………………………………………………………6

2.1.2齐纳基准源 ……………………………………………………………………6

2.1.3掩埋齐纳二极管基准源 …………………………………………………………8

2.1.4正向偏置二极管基准源 ………………………………………………………8

2.1.5带隙基准电压源 ………………………………………………………………9

2.2带隙基准源的理论分析 ……………………………………………………………12

2.2.1负温度系数的产生 ……………………………………………………………12

2.2.2正温度系数的产生 ……………………………………………………………13

2.2.3带隙基准电压的产生 …………………………………………………………13

2.3带隙基准的性能参数 …………………………………………………………………17

2.3.1温度系数 ………………………………………………………………………17

2.3.2电源电压抑制比 ………………………………………………………………17

2.3.3静态电流 ………………………………………………………………………17

2.4本章小结 ………………………………………………………………………………17

第三章 带隙基准电压源的温度特性和电源抑制特性分析…………………………………18

3.1带隙基准的温度特性分析 ……………………………………………………………18

3.1.1带隙基准电压源的温度特性分析 ……………………………………………18

3.1.2电阻对BGR的影响 ……………………………………………………………18

3.1.3温度补偿方式 …………………………………………………………………19

3.2提升带隙基准的电源电压抑制技术 …………………………………………………22

3.2.1共源共栅技术 …………………………………………………………………22

3.2.2电源电压隔离技术 ……………………………………………………………23

3.3本章小结 ……………………………………………………………………………24

第四章 带有曲率补偿的带隙基准电压源的设计 …………………………………………25

4.1带隙基准核心电路 …………………………………………………………………25

4.2偏置电路设计 …………………………………………………………………………26

4.2.1电路设计 ………………………………………………………………………26

4.2.2仿真结果…………………………………………………………………………26

4.3启动电路设计 …………………………………………………………………………27

4.4放大器设计 …………………………………………………………………………27

4.4.1电路设计 ………………………………………………………………………27

4.4.2仿真结果…………………………………………………………………………28

4.5整体电路结构及仿真验证 ……………………………………………………………29

4.5.1整体电路 ………………………………………………………………………29

4.5.2仿真结果…………………………………………………………………………29

4.6本章小结 ………………………………………………………………………………32

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