Patent ID: 7876153

Claim:
A transconductor circuit, comprising: a first input node for receiving a first input signal and a second input node for receiving a second input signal; a first differential amplifier coupled to the first and second input nodes, and having a first offset voltage; and a second differential amplifier coupled to the first and second input nodes, and having a second offset voltage different from the first offset voltage; respective output paths of the first and second differential amplifiers that are connected in parallel; a first resistance circuit coupled between the first differential amplifier and at least one current source, and a second resistance circuit coupled between the second differential amplifier and the at least one current source; and each of the first and second resistance circuits comprising at least one diode coupled between the respective differential amplifier and the at least one current source in a forward direction, and comprising a transistor having a controlled path coupled in parallel to the diode, wherein the diode comprises a first transconductance and the transistor is controlled to provide a second transconductance, and the second transconductance is negative with respect to the first transconductance.