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用opa129作放大器时和下一级该如何级联?

用opa129作电荷放大器时将电荷信号转换为电压信号,然后再对电压信号进行放大,但是总是级联起来就出错,不知级联的时候有什么要注意的事项没有?求大神帮帮忙啊!