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请教:检测信号在PA(10^-12)级别,怎么给AD8638、INA121这类正负5V双电源运放供电?

Other Parts Discussed in Thread: INA121

我要用金属探针检测气/固两相流电荷交流信号,探针输出电流估计在PA级别,然后我就分别用AD8638和INA121做电流电压转换,差分放大。可是在设计电源这块儿难住了,普通的正负5v输出开关电源模块纹波在60mV级别,误差5%,加MC78L05和MC79L05稳压后能符合要求吗?如果不能,我应该怎么做?求解答,急!谢谢啦