APPARATUS AND METHOD FOR USE WITH AN AMPLIFIER CIRCUIT

摘要

An output network for use with a multi-transistor amplifier circuit comprises N transistors configured to provide a Chireix outphasing behavior. The N transistors coupled to receive different amplitude and/or phase signals relative to a source signal. The output network comprises: a plurality of branches arranged in a hierarchical structure between N input nodes and an output node; at least one branch connection arranged between the input nodes and the output node, wherein each branch connection is arranged to couple first and second branches from an input side to a single branch on an output side. The hierarchical structure is arranged asymmetrically such that at least one branch connection comprises a different number of input nodes ultimately connected to its first branch compared to the number of input nodes ultimately connected to its second branch.