OPERATIONAL TRANSCONDUCTANCE AMPLIFIER, PREVENTING LINEARITY DISTORTION DUE TO REDUCTION OF ELECTRON MIGRATION

摘要

PURPOSE: An operational transconductance amplifier is provided to improve a lowering effect of linearity due to reduction of electron migration of an input transistor channel by improving the electron migration. CONSTITUTION: A first input transistor includes a gate for receiving a first input voltage and a source connected to a ground voltage source. A second input transistor includes a gate for receiving a second input voltage and a source connected to the ground voltage source. A first voltage clamp circuit(21) includes a first terminal connected a drain of the first input transistor. A first current source is connected between a supply voltage and a second terminal of the first voltage clamp circuit in order to supply the current to the first voltage clamp circuit. A second voltage clamp circuit(22) includes a first terminal connected to a drain of the second input transistor. A second current source is connected between a supply voltage and a second terminal of the second voltage clamp circuit in order to supply the current to the second voltage clamp circuit. A first migration compensation circuit(23) is connected between the first terminal connected to the gate of the first input transistor and the second terminal of the second voltage clamp circuit. A second migration compensation circuit(24) is connected between the first terminal connected to the gate of the second input transistor and the second terminal of the first voltage clamp circuit. A first output signal is generated from the second terminal of the first voltage clamp circuit. A second output signal is generated from the second terminal of the second voltage clamp circuit.