Patent ID: 8604874
Filing Date: 2013-12-10
Classification: H03F

Abstract:
1. An asymmetrical transformer output demultiplexing (ATODEM) circuit operable with a stack of a plurality of power amplifiers (PAs), comprising: a plurality of primary windings wherein, for each primary winding of the plurality of primary windings, the primary winding is configured to be coupled to a different corresponding PA of the plurality of PAs so that there is a PA load-line input impedance of the corresponding PA at the primary winding; first series coupled secondary windings wherein the first series coupled secondary windings being configured to be coupled to a first output load-line so that there is a first output load-line impedance at the first series coupled secondary windings; and second series coupled secondary windings configured to be coupled to a second output load-line so that there is an second output load-line impedance at the second series coupled secondary windings; wherein the plurality of primary windings, the first series coupled secondary windings, and second series coupled secondary windings are asymmetrical such that, for each primary winding of the plurality of primary windings, a transformed impedance of the first output load-line impedance substantially matches the PA load-line impedance at the primary winding as a result of an impedance transformation between the primary winding and the first series coupled secondary windings and a transformed impedance of the second output load-line impedance substantially matches the PA load-line impedance at the primary winding as a result of an impedance transformation between the primary winding and the second series coupled secondary windings.