Patent ID: 7570710

Claim:
An amplitude and phase corrector for in-phase (I) and quadrature-phase (Q) signals comprising: first means for amplitude balancing wherein the I and Q signals are balanced to produce amplitude balanced I and Q signals, the means for amplitude balancing comprising; two signal paths, at least one path comprising a variable gain element with a signal input and signal output and having a gain control input; an amplitude difference detector coupled to the signal paths; wherein the amplitude difference detector comprises: a switch to alternately select one of the signals; a peak detector coupled to the switch to detect the amplitude of the selected signal; a switch matrix and output filter for computing the amplitude difference between the alternately selected signals; control circuitry responsive to the amplitude difference detector for driving the gain control input to adjust the variable gain element to produce equal amplitude in the two signal paths; means for summing and differencing the amplitude balanced I and Q signals wherein phase is corrected to produce quadrature-phase signals; second means for amplitude balancing wherein the quadrature-phase signals are balanced to produce amplitude and phase corrected I and Q signals.