集成电路与嵌入式系统2024，Vol.24Issue(9)：42-48,7.DOI:10.20193/j.ices2097-4191.2024.0002
基于数字放大器的电容数字转换器
Capacitance-to-digital converter based on digital amplifier
摘要
Abstract
The traditional switched-capacitor(SC)capacitance-to-digital converter(CDC)based on SAR ADC uses high-voltage power supply to increase output swing in order to achieve a high capacitance detection range.However,to maintain noise performance,they re-quire high current drive,significantly increasing system power consumption.To address the above issues,this article proposes a capaci-tance-to-digital converter based on a digital amplifier,which uses the CDAC array as the analog output to bear high voltage.Only the CD AC array and sensing capacitors are driven by high voltage(5 V),while the rest is still powered by low voltage(1 V),allowing the CDC to achieve high dynamic range and sensitivity while maintaining low power consumption and low noise.In addition,for the optimi-zation of noise,this work achieves first-order noise shaping for SAR ADC by adding an integral loop in the digital amplifier,reducing the quantization noise of the system and improving the effective number of bits for CDC.On the other hand,by introducing active noise can-cellation(ANC)technology,the system's aliasing noise is reduced and the signal-to-noise ratio is improved.关键词
电容数字转换器/数字放大器/噪声整形/有源噪声抵消技术/逐次逼近模数转换器Key words
capacitance-to-digital converter/digital amplifier/noise shaping/active noise cancellation technology/SAR ADC分类
信息技术与安全科学引用本文复制引用
佟思源,钟龙杰,曹文飞,王凌,朱樟明..基于数字放大器的电容数字转换器[J].集成电路与嵌入式系统,2024,24(9):42-48,7.基金项目
国家自然科学基金项目(92164301,62021004). （92164301,62021004）
