Patent ID: 6819170
Filing Date: 2004-11-16
Classification: H03F

Abstract:
An apparatus that is arranged to provide an amplified signal in response to a differential input signal that is provided across first and second input terminals, comprising:a first resistor that is coupled between the first input terminal and a first node; a second resistor that is coupled between the second input terminal and a second node; a first current source that is coupled between the first node and a power supply, wherein the first current source is configured to respond to a drive signal; a second current source that is coupled between the second node and a power supply, wherein the second current source is configured to respond to the drive signal; a first amplifier circuit that is arranged to provide the drive signal in response to a common-mode sense signal, wherein the common-mode sense signal is associated with a common-mode portion of the differential input signal; and a second amplifier circuit that is coupled to at least one of the first and second node, wherein the second amplifier circuit is arranged to provide the amplified output signal.