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负压变正压,想法是否可行

输入电压在-3到3v之间,经过运放供给DSPADC模块,我的想法是输入电压经过电压跟随有源滤波后,再利用差分放大电路,5v或3.3v供电,uo=1/2*(3.3-uin),不知道此方案可不可行,求大神指点