A differential line driver circuit has a first operational amplifier (202)
and a second operational amplifier (204). The operational amplifiers use
resistors (214a, 214b, 218a, and 218b) to translate to the input voltages
(206 and 208) to output voltages and VOP and VON. Feedback paths
containing resistors (216a and 216b) are used to monitor output conditions
whereby impedance may be actively synthesized within the operational
amplifiers (202 and 204). The combination of the synthesized impedance
within the operation amplifiers (202 and 204) and the physical resistance
of the elements (220a and 220b) are sufficient to match the line
resistance (222) of a communication line. While obtaining impedance
matching in accordance with required specifications, the synthesized
impedance will allow for the line driver (200) to operate with
significantly reduced power consumption.