If you double convert RF to -IF1, and the -IF1 to +IF2, they "negative" part cancels out.
there are some image suppresion mixer with two IF ports, and using a hybird coupler, you can reject image freq. Hittite has many such mixers
Yes exactly. But a two tone RF can be used for reducing the DC comp at the output.
This is the reason that when using a higher IF frequency than RF, always is used high LO injection (above IF), which leads to a higher image frequency, and better image rejection.
The picture is not very clear for me. What is IF1 and IF2? Where is IF (Intermediate Frequency)?
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