A
system having dualband power
amplifier control in a dualband phone is provided using a single power
amplifier controller. The dualband phone includes two power amplifiers, where each power
amplifier amplifies the power of a
signal transmitted at a different
frequency band. A power amplifier controller is provided for controlling the amount of amplification performed by both of the power amplifiers, and a power amplifier switching device is connected to the power amplifier controller for switching the connection of the power amplifier controller between the two power amplifiers. The
system further includes a
processing device which monitors the quality and strength of the received
signal transmitted by various base stations in the transmission region of the dualband phone. The
processing device instructs the power amplifier switching device to switch its connection between the two power amplifiers based upon a determination of which
frequency band provides the optimal balance between
signal quality and
signal strength, and the dualband phone then transmits its signal within the selected optimal
frequency band. The
system measures the power of the signal transmitted from the power amplifier connected to the power amplifier controller and feeds the measured power value back to the power amplifier controller, so that the power amplifier controller may adjust the
voltage driving the power amplifier connected thereto based upon any differences found between the desired
power output of the connected power amplifier and the measured
power output.