Patent ID: 7479805

Claim:
A low voltage differential signal (LVDS) driver comprises: a first LVDS node; a second LVDS node; a load impedance circuit operably coupled between the first and second LVDS nodes; and a switching circuit operably coupled to provide a differential signal at the first and second LVDS nodes in accordance with an input signal, wherein the switching circuit includes a plurality of current controlled switching transistor circuits, each current controlled switching transistor circuit comprising: a cascode transistor having an input operably coupled to receive a bias control signal; and a switching transistor coupled in series with the cascode transistor, wherein an input of the switching transistor is operably coupled to receive a switching signal in accordance with the input signal; a first operational amplifier having a first input, a second input, and an output, wherein the first input of the first operational amplifier is operably coupled to receive a first global biasing signal, the second input of the first operational amplifier is operably coupled to receive a coupling node of the cascode transistor to the switching transistor, and the output of the first operational amplifier provides the bias control signal to a first pairing of the cascode transistor and the switching transistor; and a second operational amplifier having a first input, a second input, and an output, wherein the first input of the second operational amplifier is operably coupled to receive a second global biasing signal, the second input of the second operational amplifier is operably coupled to receive a coupling node of the cascode transistor to the switching transistor, and the output of the second operational amplifier provides the bias control signal to a second pairing of the cascode transistor and the switching transistor.