Patent ID: 6377122
Filing Date: 2002-04-23
Classification: H03F

Abstract:
A differential line driver comprises:amplifier circuit operably coupled to receive an amplified differential input signal and to produce therefrom a differential output signal; and differential input amplifier operably coupled to receive a differential input signal and to produce therefrom the amplified differential input signal, wherein the differential input amplifier includes: first amplifying transistor having a gate, a drain, and a source, wherein the gate of the first amplifying transistor is operably coupled to receive a first leg of the differential input signal; second amplifying transistor having a gate, a drain, and a source, wherein the gate of the second amplifying transistor is operably coupled to receive a second leg of the differential input signal; first controlled current source operably coupled to produce a first controlled current based on the second leg of the differential input signal, wherein the first controlled current source is further operably coupled to source the first controlled current to the first amplifying transistor; and second controlled current source operably coupled to produce a second controlled current based on the first leg of the differential input signal, wherein the second controlled current source is further operably coupled to source the second controlled current to the second amplifying transistor.