1dB Compression voltage simulation

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freewing

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I'm simulating the 1dB compression voltage of an amplifier. It's weird that the gain is not monotonically decreasing when the amplitude of input signal increases. For instance, from 25mV to 150mV, the gain increases from 1.55 to 1.63. Then from 150mV to 300mV, it decreases from 1.63 to 1.33. What's the reason and how can I get 1dB compression voltage?
 

the problem is the circuit nolinearity
what the dc operation points? keep that for 1dB compression voltage
 

In order to get 1-dB compression point, you need to run PSS simulation
 

I successfully did the 1dB compression point using PSS. It's more convenient.
 

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