Patent ID: 7400171

Claim:
A switch circuit for selectively presenting an input signal appearing at an input node of the switch circuit as an output signal at an output node of the switch circuit, the switch circuit comprising: a switch block connected between the input node and the output node and comprising first and second transistors of a first type connected in series between the input node and the output node, wherein a bulk and a channel terminal of the first transistor are connected to the input node and a bulk and a channel terminal of the second transistor are connected to the output node; and switch-control circuitry adapted to selectively open and close the switch block based on a switch-control signal, wherein the switch-control circuitry comprises: a first level shifter connected to a gate of the first transistor and adapted to convert the switch-control signal for application to the gate of the first transistor such that the voltage applied to the gate of the first transistor tracks the voltage at the input node; and a second level shifter connected to a gate of the second transistor and adapted to convert the switch-control signal for application to the gate of the second transistor such that the voltage applied to the gate of the second transistor tracks the voltage at the output node.