Abstract
A circuit includes first and second n-type transistors, and first and second p-type transistors. A first terminal of the second n-type transistor is coupled to a second terminal of the first n-type transistor. Control terminals of the first and second n-type transistors are coupled. A first terminal of the first p-type transistor is coupled to a first terminal of the first n-type transistor. A first terminal of the second p-type transistor is coupled to a second terminal of the first p-type transistor. A second terminal of the second p-type transistor is coupled to a second terminal of the second n-type transistor. Control terminals of the first and second p-type transistors are coupled. A control circuit has a first output coupled to the control terminals of the first and second n-type transistors, and a second output coupled to the control terminals of the first and second p-type transistors.