TI中文支持网交流信号，几十微伏，频率800-900kHz，请问下变频会丢失波形，精度吗？如果不变频放大直接采样是一级直接放大很多倍好还是多级放大好呢？多级级联放大会不会被噪音淹没了？如果选用24位采样速率4M以上的AD，存储30秒左右，有合适的存储芯片吗？有的话请推荐下啊
chunhua king：
线缆通信辐射的窄带信号
onebyte：
http://www.deyisupport.com/question_answer/analog/amplifiers/f/52/t/89454.aspx
弱信号采集
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