80-GHz and 40-GHz frequency dividers in 65-nm CMOS

High-speed CMOS frequency dividers with different topologies were investigated. An 80-GHz regenerative frequency divider (RFD) and a 40-GHz static frequency divider (SFD) were designed and fabricated in 65-nm CMOS technology. The RFD operates from 75.0 GHz up to 85.0 GHz, the highest speed in previously-reported CMOS RFDs, and consumes 5.17 mW from 1.2 V supply. The SFD operates from 5.0 GHz to 42.0 GHz and consumes 6.76 mW from 1.2 V supply. The divider core circuit of 80-GHz RFD and 40-GHz SFD occupy chip areas of 90 ¿m × 60 ¿m and 110 ¿m × 80 ¿m, respectively.