Patent ID: 6025742
Filing Date: 2000-02-15
Classification: H03K,H04L

Abstract:
A low voltage differential swing driver circuit comprising:a first current branch comprising first and second serially connected field effect transistors serially connected together through first and second resistors;a second current branch comprising third and fourth field effect transistors serially connected together through third and fourth resistors;a diode connecting one side of each of said current branches to one side of a source of regulated low voltage, a remaining side of said regulated low voltage source being connected to a remaining side of said current branches whereby differential currents are produced through said current branches;a voltage bias source connected to a first junction of said first and second resistors and to a second junction of said third and fourth resistors; andcontrol logic for supplying a data switching signal and an inverse of said data switching signal to a gate of said first and fourth transistors, respectively, and a complementary data switching signal and an inverse of said complementary data switching signal to a gate of said second and third transistors, respectively;whereby a differential signal is produced between said junctions which are connected to first and second transmission line loads.