Patent ID: 7671676

Claim:
A common mode feedback module comprising: a common-mode resolver receiving a first input signal and a second input signal for generating a common mode current; a control voltage generating module operatively coupled to the common mode resolver for generating a common-mode feedback voltage; and wherein the common-mode resolver comprises: a first transistor operatively coupled between a first node and a second node through a first resistor for receiving the first input signal at a gate terminal, the first resistor having value that sets the value of a current that flows through the first transistor responsive to the first input signal; a second transistor operatively coupled between the first node and the second node through a second resistor for receiving the second input signal at a gate terminal, the second resistor having a value that sets the value of a current that flows through the second transistor responsive to the second input signal, wherein the value of the second current is independent of the value of the first current; and a third transistor having a gate terminal and a drain terminal connected to the first node, and a source terminal and a bulk terminal connected to a third node for receiving a first supply voltage.