James Bond
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Hi,
Thank you for your suggestion. I have checked that doc, and my setting is correct. BTW, the Rf freq is 1.9G, the Lo freq is 1.91G.
I also simulate the core passive mixer individually, the conversion gain is about the -4dB with a capacitive load about 300fF, I check this conversion gain with both transient simulation & pss+pxf, they are coincident; Then I add some other circuit which can achieve extra gain before the passive mixer, then this time, the transient simulation & pss+pxf are not coincident. If the filter worked before, it will also work this time. And I think that the transient simulation will also consider the parasitic filter effect.
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