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仪表放大器INA826的饱和问题,但饱和是非线性的,而是放大倍数下降

Other Parts Discussed in Thread: INA826

仪表放大器型号是TI的INA826,采用单电源差分,采集电流信号
结果出现饱和,但是这个饱和又不是直接压平,而是放大倍数随着电压增大而降低

电流源是4-20mA,0.1Hz的三角波

希望能获得问题的解答,和在不改双电源下,问题的解决办法

失真情况和原理图如下,采用的Tina9仿真

加上>500mV的负压电源,就能正常