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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: IEEE Trans Med Imaging. 2010 Oct 18;30(2):512–522. doi: 10.1109/TMI.2010.2087768

Fig. 2.

Fig. 2

(a) Classic Cartesian feedback employs quadrature detection of the PA output. Quadrature mismatch ghosts, LO leakage and DC offsets alias into the control band. (b) A low IF bandpass eliminates DC/LO effects but generates two control bands. Quadrature mismatches are still aliased. (c) The FOCF scheme uses a complex bandpass to eliminate leakage and aliasing created by DC-offset and quadrature mismatches.