Kinetic energy modulated hot electron transistor

Details Kinetic energy modulated hot electron transistor Kinetic energy modulated hot electron transistor

1987-08-18

1990-08-21

James, Andrew J.

357 16, H01L 2972

Patent

active

049511076

ABSTRACT:
A kinetic energy modulated hot electron transistor (KEMHET) wherein the input voltage does not change the amplitude of the input current, but modulates the kinetic energy of the input electron beam and the probability of electron transition beyond the output collector barrier, thus controlling the current transit coefficient .alpha. and the output current. The transistor comprises two heterojunctions, each consisting of a thin barrier layer and a thick electron drift region. The thick drift regions essentially eliminate variation in barrier shape with bias voltage and reduce junction capacitance. Such a structure can overcome the main problems of a conventional hot electron transistor, such as low current gain and large input capacitance. It has the advantages of high input impedance, high current gain, short transit time, high current density and transconductance, and no feed back capacitance between output and input. In other words, it has the advantages of both FET and bipolar transistor. Calculations demonstrate that its maximum oscillation frequency (f.sub.max) can be as high as 1000 GHz.

REFERENCES:
patent: 4712121 (1987-12-01), Yokoyama
Solid State Electronics, vol. 24, pp. 343, 361-364, by Heiblum, 1981.
Electronics Letters, vol. 21, #17, pp. 757-758, by Hase et al., Aug. 1985.
Yokoyama et al., "Characterization of Double Heterojunction GaAs/AlGaAs Hot Electron Transistors", Digest of 1984 IEDM, pp. 532-536 (1984).
Mead, "The Tunnel-Emmission Amplifier", Proc. IRE, vol. 48, pp. 359-361 (1960).
Malik et al., "Recitifying, Variable Planar-Doped-Barrier Structures in GaAs", Inst. Phys. Conf. Ser. No. 56, Chapter 9, pp. 697-710 (1981).
Shannon, "Hot-Electron Camel Transistor", IEE J. Solid State & Electronic Devices, vol. 3, pp. 142-144 (1979).
Heiblum, "Tunneling Hot Electron Transfer Amplifiers (THETA): Amplifiers Operating Up To The Infrared," Solid-State Electronics, 343-366 (pp. 343 and 361-364 provided), (1981) (vol. 24).

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