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Question on simulating Quadrature Mixer

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abcyin

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Hi, all,

I am trying to simulate the OIP3 of the quadrature mixer, and I found that if I set the LO of the quadrature mixer to be 90 degree apart, that's quadrature LO input to the mixer, then the output OIP3 of the two mixers' output would be different, about 3dB difference, by QPSS analysis.
I am wondering why there would be such difference, because the two mixers are exactly the same.

Is there anybody encountering such problem, and how to solve this?

Thanks in advance,
abcyin

Solved, by PSS and PAC.
 
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