[分享] Digital一Analog Phase Shifters Using Tunable

  Up to now the tunable dielectric phase shifters were designed  as  devices  in  which  the  tunable  elements (ferroelectric film capacitors) operate in an analog regime
and thus provide continuous variation of capacitance (C) under control voltages [1, 2]. A recent publication [3] demonstrates  a digital regime for ferroelectric phase shifters in order to optimize the quality factor. However, if one uses digital control to obtain small steps of phase switching, this would result in a complicated construction and would increase the number of cascades required. The present work demonstrates that the parameters of a FE phase shifter (figure of merit, phase error and modulation
of insertion losses under control signal) can be improved due to the design of a device operating in the mixed regime, when one cascade operates in an analog and other
in a digital regime.