Patent ID: 7863976

Claim:
An adjustable stage in an amplifier, the adjustable stage comprising: a first common node; a second common node; and a plurality of independently selectable parallel amplifier segments, wherein each of the parallel amplifier segments comprises: an input at the first common node; an output at the second common node; a first transistor; an inductor to resonate with a capacitance at a base of the transistor; a capacitor in electrical communication with the first common node and the inductor, wherein the capacitor provides a stepped-down signal to the corresponding transistor; and a resistor configured such that a Q of the inductor resonating with the base of the transistor at the capacitor is sufficiently low to enable an interstage matching between a fixed stage and the base of the transistor to be substantially unaffected when one or more the amplifier segments are selected or deselected.