Signal Flow Graph .Input Node or source:A node that has only outgoing branches.This corresponds to an independent variable. .Output node or sink:A node that has only incoming branches.This corresponds to an dependent variable. .Mixed node:A node that has both incoming and outgoing branches. G3 G GA GA 日96Signal Flow Graph •Input Node or source : A node that has only outgoing branches. This corresponds to an independent variable. •Output node or sink: A node that has only incoming branches. This corresponds to an dependent variable. •Mixed node: A node that has both incoming and outgoing branches