United States Patent 7,551,027


RF power amplifier mirror circuit for sensing current

Issued:  June 23, 2009

Assignee:  Tri Quint Semiconductor, Inc. (Hillsboro, OR)

Inventors:  Salove; Matthew J. (Portland, OR), Davenport; William H. (Portland, OR), Parkhurst; Ray M. (Hillsboro, OR), Cho; Jin W. (Hillsboro, OR)

Abstract:  An apparatus and method is disclosed for providing a mirror circuit for detecting a change in current of a RF power amplifier. The mirror circuit includes a voltage operably coupled with the mirror circuit, a bias circuit operably coupled with the mirror circuit, wherein the bias circuit is capable of applying a bias voltage to the mirror circuit, and an output reference signal. The output reference signal is proportional to the change of current in the RF power amplifier.