摘要
为设计出与逐次逼近型(SAR)ADC输入适配且性能优良的信号调理电路,综合考虑分析模拟输入信号、SAR型ADC接口的前端、基准电压源和数字接口,根据噪声分析理论给出前端RC滤波器的详细设计公式和设计过程,并根据滤波器的带宽和系统噪声容限选择前端驱动放大器。通过对比芯片官方参考电路和实际测试效果表明:计算公式有效可行,放大器的分析选择科学合理,为SAR型ADC前端信号调理电路的设计提供可靠依据。
For the purpose of designing an excellent performance signal conditioning circuit to adapt to the input of successive approximation(SAR) ADC. Considering and analyzing the analog input signal, ADC interface front-end, voltage references and digital interface, and according to the noise analysis theory, the authors gave detailed front-end RC filter designing equations and process. According to the filter bandwidth and system noise tolerance, the front-end driver amplifier was chosen. The result obtained by comparing the official reference circuit of the chip and comparing the actual test shows that the formula is effective and feasible. The analysis of the operational amplifier and selection is scientific and reasonable. All this provides a reliable basis for designing the front-end signal conditioning circuit.
出处
《中国测试》
CAS
北大核心
2014年第6期79-83,共5页
China Measurement & Test
