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UIC option in SPICE?

Discussion in 'CAD' started by billcalley, Jun 23, 2005.

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  1. billcalley

    billcalley Guest

    I have read all I could find about the Use Initial Conditions (UIC)
    option in SPICE, but I still don't fully understand it. The reason I
    am confused is this: When I run a DC transient analysis with UIC
    enabled on a simple RLC tank circuit (with all passives having an IC of
    '0'), shouldn't these results be the same as a DC transient
    simulation with *no* UIC, since they should both have a initial
    starting condition of 0V/0A? Yet with the simulation with no UIC
    enabled, the circuit reaches steady state instantly; while with the UIC
    option enabled it takes a finite time to reach its voltage level, then
    over/undershoots a few time (rings) -- as it should. What am I missing

    Thank You,

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