.. currentmodule:: zero.analysis.ac.signal Small AC signal analysis ======================== The small AC signal analysis calculates the signal at all :class:`nodes <.Node>` and :class:`components <.Component>` within a circuit due to either a voltage or a current applied to the circuit's input. The input is unity, meaning that the resulting signals represent the :ref:`responses ` from the input to each node or component. The analysis assumes that the input is small enough not to influence the operating point and gain of the circuit.