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求助版主,仪表放大器问题。急

Other Parts Discussed in Thread: INA333

 现在我想放大负信号,但是我用的单电源,我想在VIN+ 和VIN-上都有加2.5V的偏置。但是我把A点加到VIN- ,A点的电压就会被拉低到几乎为0电位。求助应该怎么正确的处理负的信号(正负电源我用过可以,但是我现在就想用单电源)。如何正确的加偏置呢,能给个图就感觉不尽了。谢谢了。新手在学习中。