Geoffrey_Coram
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1) Spice ac analysis is a small-signal analysis; the dc operating point is computed, the circuit is linearized, and then the ac magnitude(s) you specified for your sources are used to stimulate the circuit.
You can set the magnitude to whatever you want:
v1 a 0 1 ac 2
Some simulators will warn or error out if you don't have an ac magnitude set for any source.
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