The combined analogue locked loop universal modulator (CALLUM)

摘要

The CALLUM modulator is proposed. By embodying the LINC componentnseparation concept within a closed-loop feedback structure, it permitsnthe realization of a highly efficient linear transmitter using practicalncomponents and requiring minimal calibration. The CALLUM modulator isnunique in that it achieves frequency translation and componentnseparation simultaneously using a pair of voltage controlled oscillatorsnwithin the feedback loop. Several prototype linear transmitters havenbeen built using this approach which have demonstrated the robustness ofnthe technique