Patent ID: 7893720

Claim:
A differential signaling circuit comprising: a first positive driver; a first negative driver, the first negative driver having different impedance than the first positive driver, the first positive driver and the first negative driver together defining a first current path between positive and negative power supply terminals, a first output being defined on the first current path intermediate the first positive driver and the first negative driver; a second positive driver, the second positive driver having an impedance similar to that of the first positive driver; a second negative driver, the second negative driver having an impedance similar to that of the first negative driver, the second positive driver and the second negative driver together defining a second current path between the positive and negative power supply terminals, a second output being defined on the second current path intermediate the second positive driver and the second negative driver; a plurality of pre-drivers responsive to input signals to provide differential drive signals to positive and negative drivers defining a current path; and a plurality of level shifters responsive to the input signals to shift levels of the input signals to desired levels; wherein the plurality of pre-drivers have asymmetrical impedances to maintain a cross over point of the first output and the second output.