Patent ID: 7002405

Claim:
A transconductance cell comprising: a first resistor having a first terminal and a second terminal; a first half-circuit including: a first feedback loop wherein the first feedback loop includes a first input transistor receiving a first input voltage at its gate and having a source coupled to the first terminal of the first resistor, a first output transistor having a source coupled to the first terminal of the first resistor, and an inverter stage having an input coupled to a drain of the first input transistor and an output coupled to a gate of the first output transistor, wherein the first output transistor provides a first output current at its drain wherein the operation of the first feedback loop causes V GS of the first input transistor to remain substantially constant; and a second half-circuit including: a second feedback loop wherein the second feedback loop includes a second input transistor receiving a second input voltage at its gate and having a source coupled to the second terminal of the first resistor, a second output transistor having a source coupled to the second terminal of the first resistor, and an inverter stage having an input coupled to a drain of the second input transistor and an output coupled to a gate of the second output transistor, wherein the second output transistor provides a second output current at its drain wherein the operation of the second feedback loop causes V GS of the second input transistor to remain substantially constant.