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This paper demonstrates the Divide-by-4/5 prescalers with merged AND gates in 2 mum GalnP/GaAs heterojunction bipolar transistor (HBT) and 0.35 mum SiGe HBT technologies. By biasing the HBT near the peak transit-time frequency (fr), the maximum operating frequency of a D-type flip-flop (D-FF) can be promoted. At the supply voltage of 5 V, the GalnP/GaAs prescaler operates from 30 MHz to 5.2 GHz, and...
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