一种适用于高温控制类应用的12位1Msps单端SAR ADC设计  

Design of a 12bit 1Msps Single Ended SAR ADC Suitable for High-temperature Control Applications

作　　者：汤雁婷 TANG Yanting(School of Electronic Information,Suzhou University,Jiangsu 215000,China)

机构地区：[1]苏州大学电子信息学院,江苏215000

出　　处：《集成电路应用》2023年第12期1-5,共5页Application of IC

摘　　要：阐述一种在180nm CMOS技术下实现的低功耗单端12位同步逐次逼近寄存器(SAR)模数转换器(ADC)设计。通过引入冗余位抑制由于参考电压缓冲器带宽不足引入的动态误差,同时采用温度码译码器控制下级板开关逻辑,克服电容阵列失配产生的静态误差,并提出一种新型参考电压缓冲器,将建立时间缩短至50ns输出稳定电压,使ADC在高温工作时依然可以快速建立转换,精度不受影响。该ADC的采样速度1MS/s,在2.7~5.5V电源下,实现了85dB的SFDR和11.8位ENOB,最高功耗5.04mW,获得了1.41pJ/转换步的优值(FoM)。This paper expounds a low-power single-ended 12bit synchronous successive approximation register(SAR)analog-to-digital converter(ADC)based on 180nm CMOS technology.By introducing redundant bits to suppress the dynamic error caused by the insufficient bandwidth of the reference voltage buffer,and using the temperature code decoder to control the switch logic of the lower board,the static error caused by the mismatch of the capacitor array is overcome,and a new reference voltage buffer is proposed,which shortens the establishment time to 80ns and outputs a stable voltage,so that the ADC can still quickly establish the conversion in high temperature operation without affecting the accuracy.The ADC has a sampling speed of 1MS/s,achieves 85dB SFDR and 11.8bit ENOB under 2.7~5.5V power supply,and the maximum power consumption is 5.04mW,and obtains a value of merit(FoM)of 1.41pJ/conversion step.

关 键 词：电路设计 低功耗 单端SAR ADC 温度码译码器 参考电压缓冲器 高温工作 

分 类 号：TN402[电子电信—微电子学与固体电子学] TN792