正在做一个小信号放大电路，要求放大nA级的电流信号，频率响应最好达到百兆HZ，输出为mv信号。
试过用OPA857来做，但是仿真发现放大其带宽达不到要求，而且在放大小于100nA的信号时，输出电压会向负电压偏移,如图
希望TI工程师推荐能符合设计要求的放大器
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