Patent ID: 8022736
Filing Date: 2011-09-20
Classification: H04L

Abstract:
1. A line driver for generating a predetermined output voltage on an output node of an integrated circuit when the output node is connected to a transmission line having a first resistance value, the line driver comprising: means for generating an output control signal in response to a digital data signal, a first stage transistor for generating a first current at an internal node in response to the output control signal, a second stage transistor for generating a second current at the output node in response to the output control signal, wherein the second stage transistor is constructed such that the second current is a predetermined number times larger than the first current, a bridge resistor connected between the internal node and a common mode voltage; a first trimmable resistive circuit connected between the internal node and the output node; and a control circuit for adjusting a total output resistance value of the line driver by controlling a series voltage across said first trimmable resistive circuit between the internal node and the output node, wherein the control circuit includes: