Patent ID: 9019013
Filing Date: 2015-04-28
Classification: H03F

Abstract:
1. A power amplifier using a differential structure, the power amplifier comprising: a first transistor and a second transistor each having a first end connected to a first power source supplying a first voltage and to which signals having a same size but opposite polarities are input; a third transistor and a fourth transistor having first ends respectively connected to the first ends of the first transistor and the second transistor; a fifth transistor, having a first end connected to second ends of the third and fourth transistors, configured to control oscillation of the third or fourth transistor, wherein the first and second transistors are configured to amplify a difference between input signals, and the third and fourth transistors are configured to assist the amplification by the first and second transistors, and wherein second ends of the first, second, and fifth transistors are connected to a second power source supplying a second voltage lower than the first voltage; and a sixth transistor whose first end being connected to the second ends of the third and fourth transistors, a second end of the sixth transistor connected to the first power source, and a third end connected to a third end of the fifth transistor.