Patent ID: 7474156

Claim:
An amplifier, comprising: an input terminal adapted to receive an input signal to be amplified; an output terminal adapted to output an amplified output signal; first, second, third, and fourth gain elements each having an input port and an output port; an input power splitter coupled to the input terminal of the amplifier and adapted to split the input power and apply the split input signal to the input ports of the first through fourth gain elements; an output resistor chain comprising three resistors extending between and connecting the output ports of the first through fourth gain elements; and an output power combiner coupled to the output ports of the four gain elements and adapted to combine output signals from the four gain elements and provide the amplified output signal to the output terminal of the amplifier, wherein the output power combiner comprises, a first capacitor connected between a first combiner node and a fixed voltage, a second capacitor connected between a second combiner node and the fixed voltage, a first inductor connected between the output port of the first gain element and the first combiner node, a second inductor connected between the output port of the second gain element and the first combiner node, a third inductor connected between the output port of the third gain element and a second combiner node, a fourth inductor connected between the output port of the fourth gain element and the second combiner node, and an output stage coupling the first and second combiner nodes to the output port of the amplifier, wherein at least two of the first, second, third, and fourth inductors have substantially different inductance values from each other.