What it means is that in an ideal differential circuit the even-order harmonics cancel and you are left with only the odd-order harmonics. Your common-mode signals will still see the even-order harmonics.
the input output expression for a balanced circuit only have odd order terms (i mean like: x or x³ or x^5), right?
with the formula it is obvious that we dont have even harmonics. but i cant see how even harmonics CANCEL each other. can you explain.
additionally, the formula says that there is not any even harmonic in a balanced circuit, so how the common mode signals can see it?
the formula is from Razavi's book (RF microelectronics)
thanks for your reply but your reply is as ambiguous as the main sentence. :wink: