低功耗增量式Sigma-Delta ADC的设计  

Design of the low-power incremental Sigma-Delta ADC

作　　者：岳佳琪 李敬国[1] 喻松林[1,2] YUE Jia-qi;LI Jing-guo;YU Song-lin(North China Research Institute of Electric-Optics,Beijing 100015,China;National Key Laboratory of Infrared Detection(Beijing Research Center),Beijing 100015)

机构地区：[1]华北光电技术研究所,北京100015 [2]红外探测全国重点实验室(北京研究中心),北京100015

出　　处：《激光与红外》2025年第1期75-80,共6页Laser & Infrared

摘　　要：通过将模-数转换器(ADC)集成到红外焦平面读出电路中实现模拟信号的数字化以及基于数字信号的智能化的技术,是目前国际上最先进的红外焦平面数字化技术。作为数字化读出电路的核心组成部分,ADC的性能指标直接影响着整体电路性能。ADC的系统架构可以分为芯片级ADC,列级ADC和像素级ADC,列级ADC是目前在红外焦平面应用最广泛的结构。依据列级数字化读出电路对ADC的要求,本文设计了一种二阶前馈增量式Sigma-Delta ADC,采用1.8 V的电源电压,ADC转换速率为26kS/s,要实现14 bit的量化精度,单个ADC功耗小于100μW。采用CMOS工艺进行电路设计,仿真结果表明,所设计的增量式Sigma-Delta ADC能够满足系统设计指标。The technology of digitizing analogue signals and digital signal-based intelligence by integrating an analogue-to-digital converter(ADC)into an infrared focal plane readout circuit is currently the most advanced infrared focal plane digitizing technology in the world.As the core component of the digital readout circuit,the performance index of ADC directly affects the overall circuit performance.The system architecture of ADC can be divided into chip-level ADC,Column level ADC and pixel level ADC,Column-level ADC is currently the most widely used structure in the infrared focal plane.According to the requirement of ADC for column-level digital read-out circuit,a second-order feed-forward incremental Sigma-Delta ADC is designed with a supply voltage of 1.8 V,an ADC conversion rate of 26 kS/s,a quantization accuracy of 14 bit,and a power consumption of less than 100μW for a single ADC.The circuit design is carried out by CMOS process,and the simulation results show that the designed incremental Sigma-Delta ADC can meet the system design specifications.

关 键 词：低功耗电路 列级ADC 增量式Sigma-Delta ADC 

分 类 号：TN215[电子电信—物理电子学] TN492