为充分利用现有模数转换器的速度来提高检测微弱信号的能力和简化电路、降低成本,本文采用叠加成形函数的方法,利用过采样技术实现对微弱信号检测.分析结果表明,用常规中分辨率ADC直接采样就可达到与现有高分辨率ADC直接采样才有的高精度.

In order to make use of the speed of analog to digital converter (ADC),advance the ADC’s ability of measuring weak signal,predigest the circuit and reduce the cost,over-sampling were combined with the saw-tooth shaped function to detect the weak signal in this paper.The analysis shows that medium resolution ADC sampling straightly can achieve high precision which is acquired only by using high resolution ADC.