The fastdc command line option (fastdc)
Description
The fastdc option speeds up the DC simulation in Spectre and APS for large-scale circuits and for cases where DC convergence is slow or there is difficulty in DC convergence.
The fastdc option provides a way to quickly obtain the approximate DC solution to start transient analysis.
fastdc command-line option may not be as accurate as the true DC solution. The solution accuracy depends on the value specified for fastdc. The available values are 0, 1, 2, 3, and 4 (default).0 - The most accurate DC result and closest to true DC solutions with the slowest performance. It should be used for the circuits that require accurate DC solution, such as analog circuits.
1 - The conservative DC result with slow performance. It should be used for the circuits that are sensitive to DC solution, such as analog dominated circuits.
2 - The reasonable DC result with moderate performance. It should be used for the circuits that are lightly sensitive to DC solution, such as mixed-signal circuits.
3 - The liberate DC results with fast performance. It should be used for the circuits that are less sensitive to DC solution, such as digital dominated circuits.
4 - The least accurate DC result with the fastest performance. It should be used for the circuits that are not sensitive to DC solution, such as digital and memory circuits.
Definition
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