Jess Chen
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If you are working with a receiver, are you computing a transfer function from an RF input to a baseband or IF output? If so, are you using an RF simulator like SpectreRF, EldoRF, or Golden Gate?
If you are looking at part of the receiver that does involve frequency conversion, the first thing that comes to mind is saturation. A transient analysis would account for saturation. Whether an AC analysis accounted for saturation would depend on the DC operating point and even so, it would not necessarily give the same result as a transient analysis.
-Jess
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