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OPA656单电源供电+12V,跨阻放大,无输入时有一直流底,约0.8V

Other Parts Discussed in Thread: OPA656

OPA656单电源供电+12V,跨阻放大,光电探测器无输入时有一直流底,约0.8V。这种用法有什么错误吗?