Patent ID: 7847655

Claim:
A switching circuit comprising: one common output port; M first switches having one set of ends connected in common to a first node, wherein M≧2 where M is a constant; N second switches having one set of ends connected in common to the common output port, wherein N≧1 where N is a constant; a third switch having one end connected to the common output port and the other end connected to the first node; M first input ports respectively connected to the other set of ends of the first switches; and N second input ports respectively connected to the other set of ends of the second switches, wherein one port selected among the first input ports and the second input ports is connected to the common output port, and if one of the first input ports is selected, the third switch is closed; and wherein each of the M first switches and each of the N second switches comprise at least two field effect transistors connected together in series.