Patent ID: 6492860
Filing Date: 2002-12-10
Classification: H03K

Abstract:
A low voltage analog switch comprising:a first transmission gate having a first N-channel transistor and a first P-channel transistor, each first and second transistor having respective drain and source terminals coupled together and forming switch drain and source terminals; and a second transmission gate comprising a second N-channel transistor coupled in series to a second P-channel transistor coupled in series to a third N-channel transistor, the second transmission gate being coupled in parallel to the switch drain and source terminals, the gates of the second and third N-channel transistors being coupled to a gate of the first N-channel transistor and a gate of the second P-channel transistor being coupled to a gate of the first P-channel transistor, wherein the second transmission gate is operable to reduce a minimum supply voltage of the switch, and wherein the first N-channel transistor and the first P-channel transistor are high threshold voltage transistors and wherein the second and third N-channel transistors and the second P-channel transistor are low threshold voltage transistors.