Staas & Halsey
Logic circuit using resonant-tunneling transistor
 A logic circuit including a resonant-tunneling transistor having a superlattice containing at least one quantum well layer, and a constant current source operatively connected between a base and an emitter of the transistor and supplying a constant current to said base. The transistor has a differential negative-resistance characteristic with at least one resonant point in a relationship between a current flowing in the base and a voltage between the base and emitter, and having at least two stable base current values at both sides of the resonant point on the characteristic, defined by the changeable base.multidot.emitter voltage. By supplying the base.multidot.emitter voltage having an amplitude of at least two amplitudes corresponding to the stable base current values, the transistor holds data corresponding to the base.multidot.emitter voltage. 
Fujitsu Limited
H G B G H G
H03K G11C B82Y G11C H03K G11C
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Naoki Toshihiko
Yokoyama Mori