CAJ | 학술논문

CMOS图像传感器信号处理中通常采用分段电容DAC产生斜坡参考电压。研究了分段电容DAC精确的电容失配及寄生与其转换精度的关系式。基于对分段电容DAC工作原理的研究，导出了电容失配及寄生模型；针对其分数桥接电容失配、各二进制电容间的失配及寄生电容问题进行了理论分析；对分段电容DAC进行非理想因素仿真，设计了一个采用分段电容DAC的10位单斜ADC并对其进行测试，仿真和测试结果均验证了理论分析的正确性。上述理论分析结果可作为分段电容DAC的设计指导。
CMOS도상전감기신호처리중통상채용분단전용DAC산생사파삼고전압。연구료분단전용DAC정학적전용실배급기생여기전환정도적관계식。기우대분단전용DAC공작원리적연구，도출료전용실배급기생모형；침대기분수교접전용실배、각이진제전용간적실배급기생전용문제진행료이론분석；대분단전용DAC진행비이상인소방진，설계료일개채용분단전용DAC적10위단사ADC병대기진행측시，방진화측시결과균험증료이론분석적정학성。상술이론분석결과가작위분단전용DAC적설계지도。
segmented-capacitor digital analog converter( SC DAC) is usually used in CMOS image sensor to generate a ramp reference voltage. Precise relationships between conversion resolution and non-ideal factors segmented-capacitor digital analog converter are derived. These non-ideal factors consist of coupling capacitor mismatch,binary-weighted-capacitor mismatch and parasitic effects. Initially,based on the study of SC DAC operation principle,mathematical models are established. Then the effects of non-ideal factors on SC DAC are analyzed. Simulation and measurement results verify the theoretical analysis. These precise relationships serve as a guideline for the design of SC DAC.