Optimising the Image Rejection in Phase-Only Multilevel LINC Transmitters

German Microwave Conference, pp. 288–291

Abstract

This work presents a process to optimise the image-rejection in phase-only multilevel LINC transmitters (PO-MLINC). The image is generated in the IQ-modulator-based phase-modulators. Compared to optimising the image-rejection for each IQ-modulator separately, it can be further optimised for the full system. To do that, the fact that the level-generating amplifiers of the PO-MLINC are operated within a limited range of input phases is exploited. The theory of this process is presented. Furthermore, simulation and measurement results are shown. The measurement results show a 7.7-dB IMRR improvement in the PO-MLINC setup.

Authors 2

1. Stefan Mueller Aachen Chair of High Frequency Electronics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of High Frequency Electronics (HFE),Aachen,Germany

   Chair of High Frequency Electronics (HFE), RWTH Aachen University, Aachen, Germany

2. Renato Negra Aachen Chair of High Frequency Electronics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of High Frequency Electronics (HFE),Aachen,Germany

   Chair of High Frequency Electronics (HFE), RWTH Aachen University, Aachen, Germany