# Two power sources, common ground and noise

I'm having the following circuit:

Where TWL6030 is a DC-DC buck converter and INA219 is a high side current sensing circuit.

My problem is with the power sources,Vbat and Vs are two different (no common ground) power supplies and Vs is a cheap noisy power source.

Is there a problem of having the common ground between INA219 and TWL6030?

Is the noise of Vs going to influence the functioning of the buck converter?