Patent ID: 7924056
Filing Date: 2011-04-12
Classification: H03K,H04L

Abstract:
1. A low voltage differential signalling driver comprising: a current source, said current source being connected to a voltage supply; a first output node and a second output node for providing a differential signal by virtue of a difference between a first voltage of said first output node and a second voltage of said second output node; first differential steering switch circuitry configured to be switched in dependence on a differential input signal to selectively connect said current source to said first output node to cause said first voltage to rise with respect to said second voltage; second differential steering switch circuitry configured to be switched in dependence on an inverse version of said differential input signal to selectively connect said current source to said second output node to cause said second voltage to rise with respect to said first voltage; and slew control circuitry configured to establish a current discharge path for said current source during a polarity transition of said differential input signal, thereby reducing a slew rate of one of said first and second voltages that is rising with respect to the other of said first and second voltages.