Fast-Phase-Switching Vector Sum Phase Shifter Using Digital Quadrature Splitter

This paper presents fast-phase-switching vector sum phase shifter using digital quadrature splitter. The digital quadrature splitter makes folding circuits produce pseudo sine and pseudo cosine functions in a pseudo-sine-cosine generator to provide high-speed phase switching and linear phase control characteristics with low power consumption. A prototype exhibits 360° linear phase shift characteristics at 5 GHz without digital pre-calculation or calibration. The measured phase switching time is 100 ns.