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在输出端输出正负1.5V的电压，经过电阻分压后直接输入到到opa354，结果只采集到正电压，如图：
Mickey Zhang 说：OPA354是rail-to-rail Input/Output运放，您的电路是单电源供电，因此输出电压最小是接近0V，而不可能输出负电压。如您需要输出负电压，建议采用双电源供电。
