Patent ID: 8836027

Claim:
A switch circuit which is turned on and turned off between a first terminal and a second terminal, the switch circuit using an LDMOS device, comprising: a first current source, one end of which is connected with a power supply voltage; a first resistance, one end of which is connected with the other end of the first current source; first and second N-type LDMOSs, respective gates of which are connected with each other to be connected with the one end of the first resistance, respective sources of which are connected with each other to be connected with the other end of the first resistance, and respective drains of which are connected with the first and second terminals; first and second P-type LDMOSs, respective drains of which are connected with the first and second terminals, respective gates of which are connected with each other, and respective sources of which are connected with each other; a second resistance, one end of which is connected with the connected sources of the first and second P-type LDMOSs; and a second current source, one end of which is connected in common with the other end of the second resistance and the connected gates of the first and second P-type LDMOSs, and the other end of which is connected with a ground voltage.