Patent ID: 8441385

Claim:
A digital to analog converter, comprising: a plurality of power dividers interconnected into a binary tree configuration, each one having an input and a pair of electrically isolated outputs for dividing power of an input signal at the input equally between the pair of outputs; a plurality of amplifiers each one of the amplifiers being coupled between one of the pair of outputs of the one of the power dividers in one stage of the tree and the input of one of the power dividers in a succeeding stage of the tree; a power combiner coupled between outputs of the amplifiers in a last one of the stages and an output of digital to analog converter; and a thermometer code generator for producing a set of binary signal, each set providing a binary signal for each the amplifiers coupled to the outputs of the power dividers in a corresponding stage of the tree, such binary signal biasing the amplifiers to a selected one of a pair of gain states.