Patent ID: 7038501

Claim:
A transconductor circuit comprising: a main circuitry comprising a first MOS transistor, a second MOS transistor connected to the first MOS transistor to be a differential pair, a third MOS transistor connected to a drain of the first MOS transistor, a fourth MOS transistor connected to a drain of the second MOS transistor, and first and second resistors serially connected between sources of the first and second MOS transistors; an auxiliary circuitry comprising a fifth MOS transistor and a third resistor that are connected between the first MOS transistor and the first resistor and a sixth MOS transistor and a fourth resistor that are connected between the second MOS transistor and the second resistor; a variable voltage supply which controls an operation of the auxiliary circuitry; and a current source which supplies the main circuitry with a bias current.