Patent ID: 7561853

Claim:
A switch comprising: at least three FETs that allow radio frequency signals from one end to travel toward another end and allow the radio frequency signals from said one end to pass across all of said at least three FETs, said at least three FETs being connected in series between a node and a ground wherein said node is connected between said one end and said another end, wherein: a drain electrode of one of the at least three FETs arranged at an initial stage is connected to said node, and a source electrode of one of the at least three FETs arranged at a final stage is connected to the ground; a drain electrode of one of the at least three FETs arranged at an intermediate stage is connected to a source electrode of the one of the at least three FETs arranged at the initial stage, and a source electrode of the one of the at least three FETs arranged at the intermediate stage is connected to a drain electrode of the one of the at least three FETs arranged at the final stage; widths of both of the drain and source electrodes of the one of the at least three FETs arranged at the intermediate stage is less than the width of the drain electrode of the one of the at least three FETs arranged at the initial stage and the width of the source electrode of the one of the at least three FETs arranged at the final stage; and means for selecting said at least three FETs to allow the radio frequency signals from said one end to travel toward said another end in the case that all of said at least three FETs are off, and allow the radio frequency signals to pass across all of said at least three FETs from said one end to the ground in the case that all of said at least three FETs are on.