Patent ID: 8564918

Claim:
An apparatus configured to prevent sub-threshold pass gate leakage, the apparatus comprising: a pass gate configured to electrically couple a first node with a second node in a first state and to electrically isolate the first node from the second node in a second state; control logic configured to control the pass gate, wherein the control logic includes a first supply rail; a first over-voltage circuit having a plurality of input nodes and a first over-voltage circuit output, the plurality of input nodes including a first input node coupled to the first node of the pass gate, and a second input node coupled to the second node of the pass gate, the first over-voltage circuit configured to compare voltages received at the plurality of input nodes and to couple the output to an input node, of the plurality of input nodes, receiving a highest voltage; and a switch configured to selectively couple the first over-voltage circuit output to the first supply rail.