Patent ID: 7193466

Claim:
A transconductor comprising: a transconductor circuit outputting an output voltage that is converted from an input voltage so as to be in proportion to a transconductance; and a direct current (DC) offset elimination circuit fixing an output DC voltage, which is changed according to a DC offset included in the input voltage, into a common mode voltage of constant magnitude, wherein the transconductor circuit including: a first transistor having a dual-pair input structure and operating in a triode region; a second transistor receiving a node voltage of the first transistor and controlling a drain-source voltage of the first transistor so that the first transistor can operate in the triode region and a first inversion amplifier, a third transistor and a second inversion amplifier disposed to increase an output resistance; and a fourth transistor supplying the electric current that is input from the DC offset elimination circuit by mirroring the current.