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高速nA级电流放大电路,求推荐放大器

Other Parts Discussed in Thread: OPA857, OPA657, LMH6629

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