Patent ID: 8451941

Claim:
A communications device comprising: an In-phase (I) circuit comprising an In-phase modulator and mixer circuit, and an I power amplifier circuit coupled thereto, said I circuit configured to modulate and amplify a digital baseband I signal to generate an amplified I signal; a Quadrature (Q) circuit comprising a Q modulator and mixer circuit, and a Q power amplifier circuit coupled thereto, said Q circuit configured to modulate and amplify a digital baseband Q signal to generate an amplified Q signal separate from the amplified I signal; a power combiner configured to sum the separately amplified I and Q signals and output a combined I and Q signal; an I demodulator circuit configured to demodulate a feedback signal from said I power amplifier circuit and to produce a demodulated I signal; a Q demodulator circuit configured to demodulate a feedback signal from said Q power amplifier circuit and to produce a demodulated Q signal; a processor configured to compare the digital baseband I and Q signals with the demodulated I and Q signals to compensate for errors; and I and Q signal inputs coupled to said I and Q circuits respectively and being isolated from the combined I and Q signal; said processor configured to selectively switch the digital baseband I signal and the digital baseband Q signal between the I and Q signal inputs to provide selective phase shifting for at least one of the digital baseband I and Q signals.