Abstract
A low-power 16:1 multiplexer (MUX) IC using undoped-emitter InP/InGaAs heterojunction bipolar transistors (HBTs) has been successfully designed and fabricated. To minimise power consumption, the collector current density of each HBT was optimised taking into account the required operating speed and the number of fan-outs. Up to 47 Gbit/s error-free operation was confirmed with low power consumption of about 3.2 W. These results demonstrate that InP/InGaAs HBT technology is attractive for fabricating over 40 Gbit/s, low-power medium-scale-integration (MSI) circuits.
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