Radio frequency power amplifier with no reference voltage for biasing and electronic system

摘要

A radio frequency (RF) power amplifier with no reference voltage for biasing is disclosed. The RF power amplifier includes a three-terminal current source circuit, a current mirror circuit and an output-stage circuit. The three-terminal current source circuit receives a first system voltage and accordingly outputs a first current and a second current, and a source voltage exists between a first output terminal of the first current and a second output terminal of the second current. The current mirror circuit receives the first current and the second current and accordingly generates a bias current. The output-stage circuit receives the bias current so as to work at an operation point. The RF power amplifier utilizes the source voltage of the three-terminal current source circuit so the first system voltage is between a first voltage and a second voltage, and then the output-stage circuit outputs an output current which does not vary with a deviation of the first system voltage also with temperature compensation.

主权项

1. A radio frequency power amplifier, comprising:
a three-terminal current source circuit, receiving a first system voltage and accordingly outputting a first current and a second current, wherein a source voltage exists between a first output terminal and a second terminal;
wherein the three-terminal current source circuit comprises: a first transistor, having a drain coupled to the first system voltage; and a first resistor, having a terminal being the first output terminal coupled to a source of the first transistor and outputting the first current, and another terminal being the second terminal coupled to a gate of the first transistor and outputting the second current, wherein the source voltage exists between the two terminals of the first resistor; a current mirror circuit, electrically connected to the three-terminal current source circuit, the current mirror circuit receiving the first current and the second current and accordingly generating a bias current; and an output-stage circuit, electrically connected to the current mirror circuit, the output-stage circuit receiving the bias current so as to operate at an operation point; wherein through the source voltage of the three-terminal current source circuit, when the first system voltage operates between a first voltage and a second voltage, the output-stage circuit outputs an output current with temperature-compensation which is stable with respect to changes of the first system voltage.