Patent ID: 7459988

Claim:
A radio frequency (RF) antenna switch comprising: a plurality of switching transistor elements coupled in series to form a switching transistor element chain comprising: an antenna connection node and a radio connection node at either end of the switching transistor element chain; and at least one interconnection node where any two of the switching transistor elements are coupled; and bias circuitry comprising: a first bias network and a second bias network, which are coupled in series between the antenna connection node and the radio connection node, and provide an intermediate node between the first bias network and the second bias network; and a bias conditioning circuit coupled between the intermediate node and one of the at least one interconnection nodes where any two of the switching transistor elements are coupled, wherein the bias circuitry is adapted to provide at least one signal path between the intermediate node and the at least one interconnection node where any two of the switching transistor elements are coupled in at least a first mode of operation, and at least one bias signal provided to the at least one interconnection node where any two of the switching transistor elements are coupled is based on an antenna signal at the antenna connection node and a radio signal at the radio connection node.