| 低失调二阶曲率补偿的带隙电压基准源设计 |
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| 引用本文： | 宋宇,吴春瑜,王绩伟. 低失调二阶曲率补偿的带隙电压基准源设计[J]. 微电子学与计算机, 2012, 29(7): 81-84,89 |
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| 作者姓名： | 宋宇 吴春瑜 王绩伟 |
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| 作者单位： | 辽宁大学物理学院,辽宁沈阳100036 辽宁省集成电路与电子系统设计联合实验室,辽宁沈阳110036 |
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| 基金项目： | 国家自然科学基金项目，辽宁省创新资金项目 |
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| 摘 要： | 基于斩波运算放大器的曲率补偿CMOS带隙电压基准源电路,采用了折叠式的一阶放大器,较二阶结构线路简单,功耗低,版图面积小,并能很好地满足增益要求.采用二阶电流补偿进行曲率补偿,使带隙电压基准源能达到更好的温度系数,且系统稳定.应用0.5μm CMOS Spice模型进行了运算放大器和带隙电压基准源的电路仿真,输出电压为1.17V,在-20℃至120℃温度下,温度系数为4.7ppm/℃.该基准电压可根据工艺和内部电阻元件选取的不同获得不同电压值,其温度范围能够满足实际工作环境的需要.
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| 关 键 词： | 斩波技术 带隙基准 失调电压 曲率补偿 |
A Low Mismatch Bandgap Voltage Reference with Second-order Curvature Compensation |
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| SONG Yu,WU Chun-yu,WANG Ji-wei. A Low Mismatch Bandgap Voltage Reference with Second-order Curvature Compensation[J]. Microelectronics & Computer, 2012, 29(7): 81-84,89 |
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| Authors: | SONG Yu WU Chun-yu WANG Ji-wei |
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| Affiliation: | 1,2(1 College of Physics,Liaoning University,Shenyang 110036,China; 2 IC & Electronics System Design Lab.of Liaoning Province,Liaoning University,Shenyang 110036,China) |
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| Abstract: | A low mismatch Curvature-Compensated CMOS bandgap reference by the mechanism of chopper modulator,we use a first-order folding amplifier,which has a simple structure,low power consumption and smaller layout area than second-order,it still has a good gain.We use second-order current compensation,make the BGR a better temperature coefficient and the system is stable.We use a standard 0.5μm CMOS process to simulate the op-amp circuit and bandgap reference circuit.The circuit delivers an output voltage of 1.17V,and achieves temperature coefficient of 4.7 ppm over-20 ℃ to 120 ℃ We can choose a different process and passive resistance to make the different reference voltage,temperature coefficient is still enough to meet the actual needs. |
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| Keywords: | chopped modulator bandgap reference offset voltage curvature compensated |
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