solanojedi wrote on Feb 18th, 2010, 8:56am:The switching couple, ideally, doesn't contributes to the output noise, isn't it?
Strictly speaking, it is not correct.
Many people think if we minimize time period when switching MOS pairs are on state at same time, we can minimize noise from RF MOS.
Again(
this is third times), it depends on IF frequency and LO signal driver circuits.
Also see
http://www.designers-guide.org/Forum/YaBB.pl?num=1162399761There are much direct feed through from RF to IF output and LO to IF in SBM(Single Balanced Mixer).