Large difference between the 1dB compression point and the IP3

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elbadry

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I am using Spectre RF for a mixer design. When I use a two tone test to get the IP2 (using swept qpss) I usually get a very large difference between the 1dB compression point and the IP3.

According to theory, IP3=P1dB+9.6 dB

However I get difference as large as 16 or 18 dB, what can be the problem?


Thanks in advance
 

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