Abstract:
A resonant tunneling diode (400) made of a silicon quantum well (406) with silicon oxide tunneling barriers (404, 408). The tunneling barriers have openings (430) of size smaller than the electron wave packet spread to insure crystal alignment through the diode without affecting the tunneling barrier height.
Abstract:
A circuit that can form the core element for analog-to-digital convertors and multi-valued to binary converter circuits is disclosed. The circuit has an input transistor 20 coupled to receive an input signal V IN . A first negative-resistance element 22, RTD couples between the output electrode V OUT of the input transistor 20 and a positive voltage source. A second negative-resistance element 3RTD couples between the input transistor 20 and ground. The peak to valley current ratio of the first negative-resistance element 22,RTD is selected to be less than the peak to valley current ratio of the second negative-resistance element 3RTD. The circuit functions to convert inputs at varying voltages (multi-valued) to two levels at the output V OUT .
Abstract:
A circuit that can form the core element for analog-to-digital convertors and multi-valued to binary converter circuits is disclosed. The circuit has an input transistor 20 coupled to receive an input signal V IN . A first negative-resistance element 22, RTD couples between the output electrode V OUT of the input transistor 20 and a positive voltage source. A second negative-resistance element 3RTD couples between the input transistor 20 and ground. The peak to valley current ratio of the first negative-resistance element 22,RTD is selected to be less than the peak to valley current ratio of the second negative-resistance element 3RTD. The circuit functions to convert inputs at varying voltages (multi-valued) to two levels at the output V OUT .
Abstract:
This invention describes any multi-deposition system, whereby directing elemental or molecular source fluxes across a substrate in an asymmetrical manner and rotating the substrate at low rotation speeds, a superlattice is formed having a composition of A(x-_x)B(1-(x-_x))/A(x+_x)B(1-(x+_x) where _x is a function of the nonuniform focusing of the elemental or molecular source fluxes A and B. More specifically, superlattices 18 are formed in the ternary and quaternary In(GaAl)As alloys on InP by molecular beam epitaxy without mechanical shuttering. The superlattice 18 is formed by nonuniformly directing the group III elements 22 and 24 onto the substrate 26 and rotating the substrate 26 across the beams. Periodic ordering is produced by rotation of the substrate 26 through a nonuniform distribution of source fluxes at the rotating substrate 26 . The growth rate and substrate rotation rate together determine the superlattice period. Other devices, systems and methods are also disclosed.
Abstract:
A resonant tunneling diode (400) made of a quantum well (406) with tunneling barriers (404, 408) made of two different materials such as calcium fluoride (408) and silicon dioxide (404). The calcium fluoride provides lattice match between the emitter (410) and the quantum well (406). Further resonant tunneling diodes with silicon lattice match barriers may be made of III-V compounds containing nitrogen.
Abstract:
A multi-function resonant tunneling logic gate is provided in which a resonant tunneling transistor (12) includes a first terminal, a second terminal, and a third terminal. A plurality of signal inputs are coupled to the first terminal of the resonant tunneling transistor (12) through a summer (10). Furthermore, a biasing input is operable to apply a bias to the first terminal of resonant tunneling transistor (12) such that the transfer characteristic of the resonant tunneling transistor (12) can be shifted relative to the signal inputs.
Abstract:
A multi-function resonant tunneling logic gate is provided in which a resonant tunneling transistor (12) includes a first terminal, a second terminal, and a third terminal. A plurality of signal inputs are coupled to the first terminal of the resonant tunneling transistor (12) through a summer (10). Furthermore, a biasing input is operable to apply a bias to the first terminal of resonant tunneling transistor (12) such that the transfer characteristic of the resonant tunneling transistor (12) can be shifted relative to the signal inputs.
Abstract:
This invention describes any multi-deposition system, whereby directing elemental or molecular source fluxes across a substrate in an asymmetrical manner and rotating the substrate at low rotation speeds, a superlattice is formed having a composition of A(x-_x)B(1-(x-_x))/A(x+_x)B(1-(x+_x) where _x is a function of the nonuniform focusing of the elemental or molecular source fluxes A and B. More specifically, superlattices 18 are formed in the ternary and quaternary In(GaAl)As alloys on InP by molecular beam epitaxy without mechanical shuttering. The superlattice 18 is formed by nonuniformly directing the group III elements 22 and 24 onto the substrate 26 and rotating the substrate 26 across the beams. Periodic ordering is produced by rotation of the substrate 26 through a nonuniform distribution of source fluxes at the rotating substrate 26. The growth rate and substrate rotation rate together determine the superlattice period. Other devices, systems and methods are also disclosed.
Abstract:
This invention describes any multi-deposition system, whereby directing elemental or molecular source fluxes across a substrate in an asymmetrical manner and rotating the substrate at low rotation speeds, a superlattice is formed having a composition of A(x-_x)B(1-(x-_x))/A(x+_x)B(1-(x+_x) where _x is a function of the nonuniform focusing of the elemental or molecular source fluxes A and B. More specifically, superlattices 18 are formed in the ternary and quaternary In(GaAl)As alloys on InP by molecular beam epitaxy without mechanical shuttering. The superlattice 18 is formed by nonuniformly directing the group III elements 22 and 24 onto the substrate 26 and rotating the substrate 26 across the beams. Periodic ordering is produced by rotation of the substrate 26 through a nonuniform distribution of source fluxes at the rotating substrate 26 . The growth rate and substrate rotation rate together determine the superlattice period. Other devices, systems and methods are also disclosed.