A V-band VCO and frequency divider MMICs for phased-locked loop

This paper presents a VCO with frequency doubler and a 1/8 frequency divider MMICs for a V-band PLL using cost effective InGaP/GaAs HBT technology. The VCO was implemented common base inductive topology with 27.5 GHz differential outputs and 55 GHz doubler output. The 1/8 frequency divider was implemented by connecting two stages of static frequency divider circuits after dynamic one. To achieve higher operating frequency, active loads are used in the dynamic frequency divider. The maximum operating frequency of the 1/8 frequency divider is higher than f_T/2 of transistor.