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.