期刊名称：International Journal of Computers and Communications
印刷版ISSN：2074-1294
出版年度：2019
卷号：13
页码：59-67
出版社：University Press
摘要：The paper describes a frequency independent phase
shifting technique suitable for applications wherein a high-phase
resolution at RF frequencies is required. For instance the propose
approach is useful both for advanced measurements systems and for
RADAR, satellite and wireless telecommunications systems. The
proposed phased array transmitter is based on an innovative
technique using the cascade of two blocks: an advanced digital block
named Phase Control Block and an up-converter block containing
integer-PLLs. The first digital block assures a high phase resolution
comparable with the precision achievable by using a Direct Digital
Synthesizer. The second block allows the up conversion at
microwaves frequencies without a significant decrease of the phaseshift
precisions. In fact, thanks to the described technique, the phase
resolution is limited only by the rms phase error introduced by the
integer-PLLs. The theory governing the design of the phase shifter is
thoroughly discussed and three prototypes operating in different
bands reporting an rms phase error lower than 0.4 degrees are
reported. The measurements are compared with theoretical results
showing a perfect agreement.
