A divide-by-2 static frequency divider with AlGaAs/GaAs HBTs technology

A divide-by-2 Static frequency divider using AlGaAs/GaAs heterojunction bipolar transistors (HBTs) was described based on a master-slave D flip-flops. For a HBT with a 3.5/spl times/8 /spl mu/m/sup 2/ emitter had a DC current gain of 30. The unity current gain cutoff frequency (F/sub t/) and the maximum oscillation frequency (F/sub max/) of the HBTs were extrapolated to about 40 GHz. The IC was tested from DC to 8 GHz and demonstrated proper function under a supply voltage of -7 V to -8 V.