Patent ID: 9712118
Date: 2017-07-18
CPC Classifications: H01P,H03F,H03H

Claim:
1. An amplifier circuit comprising: a first amplifier configured to amplify a first input signal, wherein an output of the first amplifier is coupled to an output node via a first transmission line, the first transmission line comprising a first portion having a first characteristic impedance and a first length, and a second portion having a second characteristic impedance and a second length; a second amplifier configured to amplify a second input signal, wherein an output of the second amplifier is coupled to the output node via a second transmission line, the second transmission line comprising a first portion having a first characteristic impedance and a first length, and a second portion having a second characteristic impedance and a second length; and an auxiliary amplifier configured to amplify a third input signal, wherein an output of the auxiliary amplifier is coupled via an auxiliary transmission line network to a first intersection between the first and second portions of the first transmission line, and to a second intersection between the first and second portions of the second transmission line; and wherein the sum of the lengths of the first and second portions of the first transmission line is different to the sum of the lengths of the first and second portions of the second transmission line.