second harmonic of differential signal

[nxing]

Hello everybody,

I was told by somebody that the second harmonic of the differential signals are actually common-mode signal. Is that true? How can you prove that?

thanks!

 

[hr_rezaee]

Hi
As I know it is not common mode signal but there is no second hormonic (or very small) in diff. out put.
regards

 

[Verba]

I think, that if you find second harmonic in your signal, it's caused by the common mode signal and nonlinearity of the stage. You can not see CM signal itself when you have differential signal at the input because of CMRR

 

[safwatonline]

i think this can be considered true.