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数字电位器构成的运放反馈

请问,如果我用数字电位器充当运放的反馈电阻构成可调增益的运放电路。运放为双电源供电,输入的是交流信号,请问,我需要的数字电位器的极性有没有要求,数字电位器如果单电源供电,可以放大交流信号吗?

谢谢!