Patent ID: 8269560

Claim:
A power amplifying apparatus, comprising: a power amplifier; a power regulator configured to provide, to the power amplifier, a driving voltage and a driving current corresponding to a preset control voltage; a current sensing unit configured to sense a current and a voltage corresponding to the driving current and to control the driving voltage according to the sensed current; a current control unit configured to control a current bias according to the sensed voltage; and a current bias circuit unit configured to control a bias current of the power amplifier according to the controlling of the current control unit, wherein the power regulator includes: a power transistor circuit including a first PMOSFET having a source connected to a first power supply terminal, a gate, and a drain connected to a power supply node of the power amplifier, the power transistor circuit being configured to supply the driving voltage and the driving current to the power amplifier according to a gate voltage of the first PMOSFET; and a first error amplifier having an inverted input terminal for receiving the control voltage, a non-inverted input terminal connected to the drain of the first PMOSFET through a first resistor and connected to a ground through a second resistor, and an output terminal connected to the gate of the first PMOSFET to provide the gate voltage.