Can Anybody tell me how to simulate a dual balanced mixer's image rejection? I mean is there a particular analysis in spectre that calculates it automatically. By the way mixer uses a Poly phase filter architecture to suppress image frequency.

Right now i am just taking a Fourier transform of IF output and seeing its magnitude at Image frquency. Somewhere I have read that spectre's FFT function doesn't give you a very accurate results. So let me know if i am doing something wrong or there is a better way to calculate it.

Thanks,
--Vikas

Thanks Ken

--Vikas