> Now, it gets more tricky - if the level of BOTH of the input signals is > increased by 1dB, then the levels of the 3rd order IMD products will > increase by 3DB. So, the difference between the levels of the two,
http://en.wikipedia.org/wiki/Image:Interceptpoint.png One more thing, is it always a 3:1 ratio for the slopes, just like the graph? Also is it correct to say that vertically, for a zero gain mixer, the 1:1 graph passes by the origin and when the mixer has a non-zero gain, the graph is is just shifted up or down by the dB value of the gain? Thanks, Frank
