Patent ID: 8305146
Filing Date: 2012-11-06
Classification: H03F

Abstract:
1. A multi-stage amplifier comprising: a first, a second and a third sub-amplifier, each with respective input and output ports; and a common output port; wherein the output port of the second sub-amplifier is connected via a first connection having a first electrical length L1 to the output port of the first sub-amplifier and is connected via a second connection having a second electrical length L2 to the common output port, the output port of the first sub-amplifier being connected to the common output port via the second connection, and the output port of the third sub-amplifier is connected via a third connection having a third electrical length L3 to the common output port; wherein the first connection comprises a first electrical conductor and the second connection comprises a second electrical conductor, such that the first and second electrical conductors are separate conductors; and wherein the electrical lengths L1, L2 of the connections from the second sub-amplifier's output port both to the first amplifier's output port and to the common output port are longer or shorter than one quarter of a wavelength (λ) of the frequency for which the multi-stage amplifier is intended to operate.