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A new design technique of the input filter damping network for dc-to-dc switching converters of buck type is presented. This technique is derived by means of zero dynamics analysis of the switching converter and yields equivalent results to those obtained using the classical approach based on minimizing the filter output impedance. The new method can be applied in converters of buck type with two inductors, boost with two inductors and dual SEPIC. Simulation and experimental results corresponding to a boost converter with two inductors illustrate the procedure.