Patent ID: 6177789
Filing Date: 2001-01-23
Classification: H04L

Abstract:
A line driving circuit comprising:a current source having:a tail current transistor having a drain, a gate, and a source connected to ground;a replica circuit connected to the tail current transistor that replicates a current path, the replica circuit replicating a first voltage along the current path, the first voltage being a function of a power supply voltage;an operational amplifier having an output connected to the gate of the tail current transistor, a positive input, and a negative input connected to the replica circuit, the negative input having a voltage substantially equal to the first voltage;a mirror transistor having a drain connected to the positive input of the operational amplifier, a gate connected to the gate of the tail current transistor, and a source connected to ground; anda bandgap current source connected to the drain of the mirror transistor.