Digital baseband injection techniques to reduce spectral regrowth in power amplifier

Ming Xiao, Peter Gardner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


Two novel injection techniques reduce adjacent channel power ratio (ACPR) in a nonlinear power amplifier (PA). The first injects two dasiabrick-wallpsila signals covering the adjacent channel bandwidths. All the injected sub-frequencies have the same amplitude but different phases. Tuning these phases, we plot the output signal to determine the appropriate sub-frequency amplitudes and phases to reduce ACPR. The second technique injects cubic products of the original signals, covering the adjacent channels. Both techniques, considered in theory and practice, can reduce spectral regrowth by nearly 30dB. The first is conceptually simple while the second is more practical for embedding into a predistorter.
Original languageEnglish
Title of host publicationMicrowave Symposium Digest, 2008
Number of pages4
Publication statusPublished - 1 Jan 2008
EventMicrowave Symposium Digest, 2008 -
Duration: 1 Nov 2008 → …


ConferenceMicrowave Symposium Digest, 2008
Period1/11/08 → …


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