SiGe millimeter-wave dynamic frequency divider with enhanced sensitivity incorporating a transimpedance stage

A Si/SiGe bipolar dynamic frequency divider designed for 77GHz/79GHz automotive radar is presented, which uses a transimpedance amplifier topology to improve sensitivity and operational bandwidth. Capable of operation for input frequencies from 22 GHz up to 93 GHz, the divider consumes only 35 mA at 5 V supply voltage and has a very compact die area of 295 x 475 mum
²
. In addition, measurements show that the divider operates in the full radar frequency band (76 GHz-81 GHz) up to a temperature of 100degC.