Patent ID: 7049892
Filing Date: 2006-05-23
Classification: H03F,H03G

Abstract:
1. A high frequency power amplifier circuit device comprising: a plurality of semiconductor amplification elements electrically connected in cascade; a first transistor adapted to form a current mirror circuit with one of the semiconductor amplification elements; a second transistor adapted to form a current mirror circuit with another one of the semiconductor amplification elements; and a bias circuit coupled to the first transistor, and to the second transistor, and arranged to receive a control signal, wherein the first transistor has a first control terminal and a second terminal, and is arranged to receive from the bias circuit a first control current at said first control terminal and said second terminal, and wherein the second transistor has a second control terminal and a third terminal, and is arranged to receive from the bias circuit a second control current at said second control terminal and said third terminal.