| 一个对温度不敏感的高增益运算放大器设计 |
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| 引用本文： | 罗志聪,黄世震.一个对温度不敏感的高增益运算放大器设计[J].现代电子技术,2010,33(14):4-6. |
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| 作者姓名： | 罗志聪 黄世震 |
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| 作者单位： | 1. 福建农林大学,机电工程学院,福建,福州,350002
2. 福州大学,福建省集成电路重点实验室,福建,福州,350002 |
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| 摘 要： | 功率放大器是大功率器件,其自身会消耗大部分的功耗,并导致功率放大器芯片的温度在一个很大的范围内变化,因此功率放大器的控制电路需要对环境温度的变化不敏感。针对这一要求,设计出一个对温度不敏感的全差分CMOS运算放大器,该运算放大器采用TSMC 0.18μm工艺,选用折叠式共源共栅、宽摆幅偏置电路结构。在负载电容为10 pF条件下,最大直流增益达到115 dBm,相位裕度为70°;在整个温度范围内（-40~＋125℃）运算放大器的增益变化仅为1 dBm,相位裕度仅变化5°,满足设计要求。
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| 关 键 词： | 全差分运算放大器 负载电容 增益 相位裕度 |
Design of Temperature-insensitive and High Gain Operational Amplifier |
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| LUO Zhi-cong,HUANG Shi-zhen.Design of Temperature-insensitive and High Gain Operational Amplifier[J].Modern Electronic Technique,2010,33(14):4-6. |
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| Authors: | LUO Zhi-cong HUANG Shi-zhen |
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| Affiliation: | 1. Mechanical and Electrical Engineering College, Fujian Agriculture and Forestry University, Fuzhou 350002, China 2. Fujian Key Laboratory of Microelectronics Integrated Circuits, Fuzhou University, Fuzhou 350002, China) |
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| Abstract: | The power amplifier is a high-power device, which can consume most of the power, and change the temperature of the chip in a large extent, therefore, the output power control circuit of PA should be insensitive to the change of ambient temperature. A temperature-insensitive and fully differential CMOS operational amplifier is designed based on TSMC 0.18/1m process, and it consists of folding cascode opamp and wide-swing bias circuit. The maximum DC gain up to ll5dBm and the phase margin is 70 degrees under the conditions that load capacitance is 10p; the gain variation is only ldBm and the phase margin is only 5 degrees in the entire temperature range （-40~＋125℃ ）. |
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| Keywords: | fully differential operational amplifier load capacitance gain phase margin |
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