Patent ID: 7834697

Claim:
A method of up-converting low frequency differential mode noise generated in a common mode feedback circuit comprising: generating differential voltage signals at an output of said differential amplifier, said output having a positive voltage output and a negative voltage output; connecting a first side of a first resistor to said positive voltage output of said differential amplifier; connecting a first side of a second resistor to said negative voltage output of said differential amplifier; providing a transconductance amplifier that has a positive input and a negative input and that generates a common mode output current signal on both a first output and a second output; applying a common mode voltage of said differential amplifier to said negative input of said transconductance amplifier by connecting said negative input of said transconductance amplifier to said second side of said first resistor and a second side of said second resistor; up-converting said low frequency noise by modulating said common mode output current signal at a predetermined frequency which up-converts said low frequency noise to said predetermined frequency.