Patent ID: 8526535

Claim:
A communications device comprising: an In-phase (I) circuit comprising an I power amplifier circuit and said I circuit configured to modulate and amplify a digital, baseband I signal; a Quadrature (Q) circuit comprising a Q power amplifier circuit and said Q circuit configured to modulate and amplify a digital, baseband Q signal; a power combiner configured to receive the separately modulated and amplified I and Q signals and output a combined I and Q signal; an I demodulator circuit that directly receives a feedback signal from the I power amplifier circuit and configured to demodulate the feedback signal from the I power amplifier circuit and produce a demodulated I signal; a Q demodulator circuit that receives a feedback signal from the Q power amplifier circuit and configured to demodulate the feedback signal from the Q power amplifier circuit and produce a demodulated Q signal; and a processor configured to compare the digital, baseband I and Q signals with the demodulated I and Q signals to compensate for at least one of an amplitude error, a frequency error, and a phase modulation error.