Patent ID: 6175255
Filing Date: 2001-01-16
Classification: H04L

Abstract:
An apparatus including a differential current driving circuit for providing a differential signal to an external circuit, said differential current driving circuit comprising:a transformer having a primary winding and a secondary winding, the primary winding having a center tap;a varying current source coupled to the center tap of the transformer and configured to source a first drive current into a current steering circuit;first and second nodes coupled directly to the primary winding of the transformer and to the external circuit and configured to convey second and third drive currents; andthe current steering circuit coupled to the primary winding of the transformer and configured to receive first and second input signals,wherein the current steering circuit, in accordance with the first input signal, steers the first drive current to provide the second drive current, and in accordance with the second input signal steers the first drive current to provide the third drive current, wherein the second and third drive currents form at the first and second nodes the differential signal.