Patent ID: 7649948
Filing Date: 2010-01-19
Classification: H03F,H04L

Abstract:
1. An xDSL multistandard driver circuit for amplifying an xDSL signal which is applied to an input of said xDSL multistandard driver circuit; said xDSL multistandard driver circuit being configured to be adjusted to different xDSL settings of different xDSL standards according to an operating mode control signal and comprising: an operational amplifier configured to amplify said xDSL signal applied to said xDSL multistandard driver circuit; said operational amplifier being powered by a variable voltage supply and having a gain being adjustable by said operating mode control signal; a signal monitoring circuit which is activated by said operating mode control signal; said signal monitoring circuit being configured, when activated by said operating mode control signal, to generate a control signal to adjust the voltage of said variable voltage supply in order to adjust a maximal signal swing of the output signal of said operational amplifier; said control signal being generated by comparing an amplitude of said xDSL signal applied to said xDSL multistandard driver circuit with an amplitude threshold value: and a first resistor, a second resistor and a first switching device which is controlled by said operating mode control signal; said switching device being configured to connect the first resistor or the second resistor between the output and the input of said operational amplifier dependent on said operating mode control signal to adjust said gain of said operational amplifier.