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关于微弱电流检测放大器的选择

Other Parts Discussed in Thread: LMH6629, OPA657, OPA847, LOG114

现在需要对nA级的微弱电流检测,前置用跨阻放大,频率在1M左右,初步选择LMH6629、OPA657、OPA847.哪种运放比较合适,请帮忙看看!