| 一种12-bit 1MSPs SAR ADC的设计 |
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| 引用本文： | 李崎璋,李哲英.一种12-bit 1MSPs SAR ADC的设计[J].北京联合大学学报(自然科学版),2011,25(4):6-9. |
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| 作者姓名： | 李崎璋 李哲英 |
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| 作者单位： | 1. 北京交通大学电子信息工程学院,北京,100044
2. 北京联合大学微电子研究所,北京,100101 |
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| 基金项目： | 国家自然科学基金项目，北京市教委项目(PHR |
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| 摘 要： | 设计了工作在5 V单电源电压下,典型采样速度为1 MSPs的12位低功耗逐次逼近型模数转换器。设计中D/A转换器采用了加电容分压器的电荷分布式结构,在扩展并行D/A转换器分辨率的同时大大节省了芯片面积,内置的3.3 V参考电压源采用自偏置的供电方式,提高了基准电压的精度,同时也降低了功耗。使用cadence spectre工具进行仿真,后仿结果表明,设计的D/A转换器、3.3 V基准源满足12 bit A/D转换的要求,逐次逼近A/D转换器可以正常工作。
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| 关 键 词： | A/D转换器 D/A转换器 逐次逼近 参考电压源 |
A Design of a 12-bit 1MSPs SAR ADC |
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| LI Qi-zhang,LI Zhe-ying.A Design of a 12-bit 1MSPs SAR ADC[J].Journal of Beijing Union University,2011,25(4):6-9. |
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| Authors: | LI Qi-zhang LI Zhe-ying |
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| Institution: | 1.School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China; 2.Institute of Microelectronic Application Technology,Beijing Union University,Beijing 100101,China) |
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| Abstract: | A 12-bit low power SAR A/D converter with medium speed is designed,which can work under a 5 V power supply.A charge scaling D/A converter with capacitor voltage divider is designed,which extends the resolution of a parallel D/A converter as well as reduces the chip area.Built-in 3.3V self-biasing reference voltage source improves the accuracy of the reference voltage,and also reduces power consumption.The simulation result shows that the reference voltage source and the D/A converter meet the requirements of the 12-bit A/D converter,and the SAR A/D converter can work well. |
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| Keywords: | A/D converter D/A converter successive approximation reference voltage source |
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