Patent ID: 8098088

Claim:
A switch circuit comprising: at least three serially coupled field effect transistors (FETs) configured to receive a first supply input and switch the first supply input to output a voltage output signal, the at least three FETs comprising: a first FET having a well coupled to receive the first supply input of a first voltage level, a second FET having a well coupled to a drain of the first FET, a gate of the second FET coupled to receive a second supply input of a second voltage level lower than the first voltage level, and a third FET having a well coupled to a drain of the second FET, a gate of the second FET coupled to receive a third supply input of a third voltage level lower than the second voltage level, and a control circuit for providing at least the second supply input and the third supply input to the at least three FETs responsive to receiving an input signal of a fourth voltage level lower than the first voltage level, the control circuit comprising a first diode coupled between a source of the second FET and a gate of the second FET.