Patent ID: 7420417
Filing Date: 2008-09-02
Classification: H03F

Abstract:
1. A two-port dual-gate amplifier, comprising: a dual-gate field-effect transistor device, having a first gate as a input port of the amplifier for receiving RF input signal, a second gate for applying gate bias, and a drain as a output port of the amplifier for providing amplified output signal; and a self-bias circuit, electrically coupled the output port of the amplifier with the second gate of the dual-gate transistor for providing gate bias without any external bias, the self-bias circuit including two resistive components electrically connected in series as a voltage divider, with one terminal connected to the output port of the amplifier and the other terminal connected to ground, a mode between the two resistive components being connected to the second gate of the amplifier, and a shunt capacitor connected from the node of the voltage divider to ground.