Mobile wireless communications device with separate In-phase (I) and Quadrature (Q) phase power amplification and power amplifier pre-distortion and IQ balance compensation

A mobile wireless communications device, comprising:

• a housing;
• an antenna carried by the housing;
• at least one circuit board carried by the housing and including radio frequency (RF) circuitry carried by the at least one circuit board and comprising a transceiver connected to said antenna through which RF communications signals are transmitted and received, and a processor carried by the at least one circuit board and operative with the RF circuitry, wherein said transceiver further comprises an In-phase and Quadrature (I/Q) modulation and power amplification circuit comprising
• an In-phase (I) circuit comprising an In-phase modulator and mixer circuit and an I power amplifier circuit that receives a digital, baseband I signal and modulates and amplifies the I signal;
• a Quadrature (Q) circuit comprising a Quadrature modulator and mixer circuit and a Q power amplifier circuit that receives a digital, baseband Q signal and modulates and amplifies the Q signal;
• a power combiner that receives the separately amplified I and Q signals and sums and outputs the I and Q signals as a combined I and Q signal;
• an I demodulator circuit that receives a signal feedback from the I power amplifier and demodulates the feedback signal to produce demodulated I signals;
• a Q demodulator circuit that receives a signal feedback from the Q power amplifier and demodulates the feedback signal to produce demodulated Q signals;
• and
• said processor comparing the digital, baseband I and Q signals with the demodulated I and Q signals to compensate for amplitude, frequency and phase modulation errors wherein I and Q signal inputs are isolated from the combined I and Q signal to enhance antenna matching and transmit radiated power (TRP) and reduce harmonic emission from the respective I and Q power amplifier circuits.

A method of operating a mobile wireless communications device, which comprises:

• providing a housing, an antenna mounted within the housing, at least one circuit board carried by the housing and including radio frequency (RF) circuitry carried by the at least one circuit board and comprising a transceiver connected to said antenna through which RF communications signals are transmitted and received;
• processing RF communications signals in an In-phase (I) circuit comprising an In-phase modulator and mixer circuit and an I power amplifier circuit that receives a digital, baseband I signal and modulates and amplifies the I signal and in a Quadrature (Q) circuit comprising a Quadrature modulator and mixer circuit and a Q power amplifier circuit that receives a digital, baseband Q signal and modulates and amplifies the Q signal;
• power combining the separately amplified I and Q signals;
• receiving a signal feedback from the I power amplifier and demodulating the feedback signal to produce demodulated I signals;
• receiving a signal feedback from the Q power amplifier and demodulating the feedback signal to produce demodulated Q signals;
• and
• comparing the digital, baseband I and Q signals with the demodulated I and Q signals within a processor to determine amplitude, frequency and phase modulation errors wherein I and Q signal inputs are isolated from the combined I and Q signal to enhance antenna matching and transmit radiated power (TRP) and reduce harmonic emission from the respective I and Q power amplifier circuits.