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你好，前级的运放最好选择低噪声的，如LMP7711，OPA2322，LMP7701等，主要还要根据你的带宽、信号增益等再具体确定
在了解运放主要电气参数的同时，可在常用的运放选型中进行选择：http://www.ti.com/lsds/ti/amplifiers-linear/general-purpose-amplifier-products.page
