Patent ID: 8928402
Filing Date: 2015-01-06
Classification: H03F

Abstract:
1. A device including a Doherty amplifier, the Doherty amplifier comprising: an amplifier input and an amplifier output at least one main amplifier coupled to the amplifier input via a main input impedance and further coupled to the amplifier output via a main output impedance; a plurality of additional amplifiers, each said amplifier being coupled to the input via respective additional input impedances, each additional amplifier comprising a respective additional amplifier output coupled to a respective pair of additional impedances connected in series and having a respective connection node between them, a first additional amplifier having their respective additional impedances coupled between its respective output and the amplifier output, the pair of additional impedances having a first impedance and a second impedance, the first impedance being connected to the respective additional amplifier output and to the connection node, the second impedance being coupled between their respective connection node and the connection node of the previous additional amplifier; further comprising a first phase splitter coupled to the input and generating two first splitter output signals in quadrature with each other, each of the first splitter outputs being further connected to a respective further phase splitter, which are functionally analogous to the first phase splitter, each output of the further phase splitters being coupled to the respective inputs of the main amplifier and the additional amplifiers.