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OPA656单电源供电,输出信号为什么会有一个1伏基础电压?

Other Parts Discussed in Thread: OPA656

左图为OPA656跨阻运放,电流源IG1为正弦电流源。J2为0V,J1为12V单电源供电。J4为0V。右图为输出,输出有一个1V的基础电压,为什么办理出信号不能为0V为基础电压?