Patent ID: 6495997
Filing Date: 2002-12-17
Classification: G05F

Abstract:
A driver circuit comprising:a first transistor and a second transistor coupled in parallel to provide a differential output signal, said first and second transistors having their gates coupled to receive a differential input signal and in which said first and second transistors operate as a switch to have a voltage swing of the input signal reduced in amplitude to generate the output signal having less of a voltage swing than the input signal; a third transistor and a fourth transistor arranged to form a current mirror to provide a reference current and a mirror current respectively, said fourth transistor coupled to said first and second transistors, in which the mirror current when coupled to a load generates the differential output signal; and a voltage scaling circuit coupled to said current mirror to establish a scaling voltage to establish scaling of signal reduction between the input signal and the output signal, the scaling voltage when coupled to a reference impedance establishes a value for the reference current.