Patent ID: 7633346
Filing Date: 2009-12-15
Classification: H03F

Abstract:
1. A transconductance compensating bias circuit compensating for a transconductance of a field-effect transistor, the transconductance compensating bias circuit comprising: a first field-effect transistor having a first electrode, a second electrode, and a gate connected to the first electrode, wherein a reference current flows through the first and second electrodes; a second field-effect transistor having a first electrode, a second electrode, and a gate connected to the gate of the first field-effect transistor, wherein a bias current flows through the first and second electrodes; a resistor connected to one of the second electrode of the first field-effect transistor and the second electrode of the second field-effect transistor; and a comparison part configured to output a signal corresponding to a result of comparison of a first potential of the first electrode of the first field-effect transistor and a second potential of the first electrode of the second field-effect transistor, wherein the reference current and the bias current are controlled by the output signal of the comparison part so as to equalize the first potential and the second potential.