一个14位的混合模拟到数字转换器用于红外焦平面阵列的数字读取集成电路集成电路
Douming Hu1, Libin Yao1, Nan Chen1
1Kunming Institute of Physics, Kunming 650223, China.
Sensors (Basel, Switzerland)
|June 19, 2024
概括
本研究介绍了用于红外焦平面阵列的14位混合模拟数字转换器 (ADC),提高了功率和速度. 这种新的设计结合了连续近似寄存器 (SAR) 和单斜坡 (SS) ADC,以实现高效,高性能的数字成像.
科学领域:
- 电气工程 电气工程
- 混合信号集成电路混合信号集成电路
- 传感器技术 传感器技术
背景情况:
- 数字红外焦平面阵列 (IRFPA) 需要高性能模拟数字转换器 (ADC) 进行准确的成像.
- 现有的ADC经常面临电力消耗和速度的限制,阻碍了紧的,高分辨率的IRFPA的开发.
- 在多位ADC中,对于降低电容计数和放松匹配要求的高效量子化技术的需求至关重要.
研究的目的:
- 为数字IRFPAs设计了一种新的14位混合列平行ADC.
- 为解决IRFPAs现有的ADC架构中的功率和速度妥协问题.
- 为了减少单元电容器的数量,并放松电容器阵列匹配,以提高小像素距 IRFPA 的可制造性.
主要方法:
- 一个双相混合ADC架构,结合了7位连续近似寄存器 (SAR) ADC用于粗量化和7位单倾斜 (SS) ADC用于细量化.
- 为粗量化阶段实施一个分段的温度计编码数字对模拟转换器 (DAC) 的权衡.
- 在SAR和SS ADC之间共享DAC和比较器模拟电路,以最大限度地减少功耗和布局面积.
主要成果:
- 实现了 -0.61/+0.84 LSB的差异非线性 (DNL) 和120 kS/s的采样速率.
- 在77K时显示的时间噪声为1.7LSBrms,信号噪声和扭曲比率 (SNDR) 为72.9dB,有效位数 (ENOB) 为11.82位.
- 混合ADC采用180纳米CMOS工艺制造,其总功耗为71μW.
结论:
- 拟议的14位混合ADC有效地提高了数字IRFPA的功率和速度性能.
- 混合架构和细分DAC有助于改进线性和放松电容匹配,从而实现非校准.
- 这种设计为先进的IRFPA提供了紧且节能的解决方案,特别是具有小像素距离的IRFPA.
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