Patent ID: 8923492

Claim:
A line driver circuit, comprising: a first amplifier stage configured to receive and amplify an input signal, the first amplifier stage having differential outputs; a second amplifier stage coupled to the differential outputs of the first amplifier stage and configured to further amplify the input signal for transmission in one of a first transmission mode and a second transmission mode; at least one lift amplifier having an input coupled to an output of the first amplifier stage, the lift amplifier operable to selectively vary the voltage supply of the second amplifier stage based, at least in part, on an operable transmission mode; a plurality of passive elements; a first plurality of mode switches configured to selectively establish a first feedback loop from a first set of the plurality of passive elements to support the first transmission mode; and a second plurality of mode switches configured to selectively establish a second feedback loop from a second set of the plurality of passive elements to support the second transmission mode.