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PSS+PAC analysis for current-mode circuit in Cadence

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I am trying to simulate a current-mode mixer which simply consists of quad switching pairs. At first I used isource at the input. But when I want simulate the mixer's distortion performances, e.g. IIP2, IIP3.. with SpectreRF, I need to replace isource with power based PORTs. The problem is my circuit input is driven by current, and I need to fill in voltage magnitude or power magnitude to PORT's properties. Has anyone got experience on how to use PORTs, and PSS together with PAC for current commutating circuits?

Many thanks~
 

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