Mobile wireless communications device with adjustable impedance matching network and associated methods

摘要

A mobile device includes an adjustable impedance matching network coupled between a power amplifier and an antenna and has an adjustable impedance element. An impedance sensor is coupled between the power amplifier and adjustable impedance matching network. A processor is configured to a) calculate a corrected antenna load impedance based upon a sensed impedance at inputs of the impedance matching network and a current value of the adjustable impedance element, and b) determine a new value for the adjustable impedance element based upon the corrected antenna load impedance. The processor is also configured to c) set the adjustable impedance element to the new value, and d) sense a new impedance at the inputs and determine if the sensed new impedance is within a threshold value of the power amplifier impedance, and repeat steps a), b), and c) if the sensed new impedance is not within the threshold value.

主权项

1. A mobile wireless communications device comprising:
an antenna; a power amplifier having an amplifier impedance; an adjustable impedance matching network coupled between said power amplifier and said antenna and comprising at least one adjustable impedance element; an impedance sensor coupled between said power amplifier and said adjustable impedance matching network; a processor coupled to said power amplifier, said adjustable impedance matching network and said impedance sensor, said processor configured to
a) calculate a corrected antenna load impedance based upon a sensed impedance at inputs of said impedance matching network and based upon at least one current value of said at least one adjustable impedance element,b) determine at least one new value for said at least one adjustable impedance element based upon the corrected antenna load impedance,c) set said at least one adjustable impedance element to the at least one new value, andd) sense a new impedance at the inputs of said adjustable matching network and determining if the sensed new impedance is within a threshold value of the power amplifier impedance, and repeat steps a), b), and c) if the sensed new impedance is not within the threshold value of the power amplifier impedance.