Patent ID: 8223885

Claim:
A communications device, 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 a processor that compares 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.