Patent ID: 8098095
Filing Date: 2012-01-17
Classification: H03F

Abstract:
1. A power amplifier, comprising: N power amplification means each configured to amplify an input signal into a predetermined level; a transformer configured to comprise N/2 primary windings respectively connected to output terminals of the power amplification means and a secondary winding configured such that coil elements are connected in series between an output terminal and a ground, and configured to sum power transmitted from the primary windings; and a harmonic elimination unit disposed across both ends of the secondary winding of the transformer, and configured to eliminate output of harmonic frequencies of a preset frequency, wherein, the harmonic elimination unit is formed in a layout disposed inside the transformer, and wherein the primary windings of the transformer are configured to include a first segment in which one end thereof is connected to a positive input port and a remaining end thereof is connected to a first common port and a second segment in which one end thereof is connected to a negative input port and a remaining end thereof is connected to a second common port separate from the first common port, and the secondary winding of the transformer is configured such that a first turn is disposed between the first and second segments and a second turn is disposed inside the second segment.