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An ultrahigh-speed full adder using resonant-tunneling diodes (RTDs) has been investigated by circuit simulation. The adder uses NOR logic gates, each of which consists of four RTDs (called 4RTD logic gate), with a four-phase pipelined scheme. Circuit simulation has been carried out by assuming an InP-based RTD device model, the peak current density and the peak-to-valley ratio of which are 5.0 times...
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