Circuit with filtering and analog/digital conversion function

The invention belongs to the field of signal processing circuits, and specifically relates to a circuit with filtering and analog/digital conversion function capable of filtering analog signals and conducting analog/digital conversion. The circuit comprises a subtraction circuit, a filter circuit, an addition circuit, a sample hold circuit, an analog/digital conversion circuit and a clock circuit, wherein analog voltage signals are connected to the positive input end of the subtraction circuit, the output end of the sample hold circuit is connected to the negative input end of the subtraction circuit, and the input end of the filter circuit is connected with the output end of the subtraction circuit. The influence of interference signals in incoming signals is made prominent, so that the filter circuit can filter the interference signals. The filtering effect is excellent. 本发明属于信号处理电路领域，特别是涉及到种能够对模拟信号进行滤波和模拟/数字转换处理的具有滤波和模拟/数字转换功能的电路。本发明提出的具有滤波和模拟/数字转换功能的电路具体包括减法电路、滤波电路、加法电路、采样保持电路、模拟/数字转换电路和时钟电路构成，具体连接方式为：模拟电