90 GHz operation of a novel dynamic frequency divider using InP/InGaAs HBTs

Abstract

We present 90 GHz operation of a 1/8 digital frequency divider IC fabricated with InP/InGaAs HBTs having a current gain cutoff frequency (f/sub /spl tau//) of over 150 GHz and a maximum oscillation frequency (f/sub max/) of over 200 GHz. To our knowledge, this toggle frequency is the highest ever reported for digital frequency dividers. A novel dynamic toggle flip-flop (T-FF) was employed in order to achieve ultrafast operation.