# Common mode noise from two ADC results

I am sampling two sinusoidal analogue signals that are phase separated by $\frac{2\pi}{3}$, and there appears to be a significant amount of common mode noise in my samples. What, if any approach can I take to improve my SNR?

• Are the analog sources and ADC's properly grounded/isolated/terminated? – rickhg12hs Jan 10 '14 at 14:36
• No, I don't think they are. I don't have control over the physical board and ADCs only the software so I am trying my best to fix the real problem in software. – man Jan 10 '14 at 15:03