Patent ID: 7088127
Filing Date: 2006-08-08
Classification: H03K

Abstract:
1. An output driver, comprising: an output port configured to output a data signal; a level shifter configured to drive a current to said output port in response to an input signal; an adjustable impedance controller configured to generate an impedance adjustment signal in accordance with topology information; and an output impedance compensator configured to adjust the impedance of said level shifter in accordance with said impedance adjustment signal and in accordance with a reference voltage, wherein said level shifter includes a first transistor for providing electro-static discharge protection, wherein said first transistor has a drain terminal coupled to said output port and a gate terminal coupled to a voltage output of said output impedance compensator, and a second transistor for outputting a signal with an output drive current in response to said input signal, wherein said second transistor has a drain terminal coupled to the source terminal of said first transistor, a source terminal coupled to circuit ground, and a gate terminal coupled to said input signal.