Patent ID: 8754712

Claim:
A system comprising: a first transistor comprising a first input node coupled to a first signal input, a first output node coupled to a first common node, and a first reference node coupled to a first reference voltage; a second transistor comprising a second input node coupled to second signal input, a second output node coupled to an output of the system, and a second reference node coupled to the first common node; a first switch switchably coupling the first common node to a second reference voltage; a controller, wherein the first switch comprises a control input coupled to the controller, wherein the first switch is configured to be open when the control input is in a first state, and the first switch is configured to be closed when the control input is in a second state; and the controller is configured to selectively couple a first signal to the first signal input when the control input is in the first state, and couple the first signal to the second signal input when the control input is in the second state.