应用于微测辐射热计的12位SAR ADC的设计  

Design of 12-bit SAR ADC for Micro-bolometer

作　　者：黄伟奇 唐祯安 HUANG Wei-qi;TANG Zhen-an(Faculty of Electronic Information and Electrical Engineering,Key Lab.of Liaoning for Integrated Circuits Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学电子信息与电气工程学部,辽宁省集成电路技术重点实验室,辽宁大连116024

出　　处：《仪表技术与传感器》2020年第3期31-37,共7页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(61131004,61274076,61874018)。

摘　　要：针对红外探测微测辐射热计的应用,设计了一种12位全差分高速低功耗逐次逼近型模数转换器(SAR ADC)。该设计采用了新型的电荷重分配型数模转换器(DAC),通过对高位码字(MSB)段与低位码字(LSB)段采用两种不同参考电压的方案,使电路在保证性能的同时降低功耗与面积。电路基于CSMC 0.18μm CMOS工艺,对模数转换器整体进行仿真,当采样频率为5 MSPS,输入频率为195.3 kHz的正弦波信号时,输出信号的无杂散波动态范围(SFDR)为74.1 dB,有效位数为10.66 bit,功耗为200μW,品质因数为24 fJ/conversion-step。Aiming at the application of infrared detecting micro-bolometer,a 12-bit full differential high speed and low power successive approximation register analog-to-digital converter(SAR ADC)was designed.The design adopted a new type of DAC capacitor array,by using two different reference voltage schemes for MSB segment and LSB segment,which enabled the circuit to reduce power consumption and area while ensuring performance.The circuit was based on CSMC 0.18μm CMOS process,the circuit was simulated when the sampling frequency was 5 MSps and the input frequency was 195.3 kHz sine wave signal.As a result,the spurious free dynamic range(SFDR)is 74.1 dB,the effective number of bits(ENOB)is 10.66 bit,the power consumption is 200μw and the factor of merit is 24 fJ/conversion-step.

关 键 词：逐次逼近 模数转换 低功耗 新型电容阵列 微测辐射热计 

分 类 号：TN215[电子电信—物理电子学]