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An ac analysis needs at least one source with an ac amplitude higher than zero! The operating method of an ac analysis is described in the ac analysis dialog.

All independent sources (const, sinus, ...) have parameters for the ac analysis (ac magnitude and ac phase).

• If you still have not placed any source (with ac parameters) in the schematic, then you find a suitable source in the branch simulation\ analog\ source\ independent of the component tree view.
• Else: Edit component model (input an ac magnitude higher than zero).