Oscillators – Relaxation oscillators
Patent
1987-04-06
1988-05-17
James, Andrew J.
Oscillators
Relaxation oscillators
357 16, 357 4, 331 941, 372 43, H01L 2714
Patent
active
047454520
ABSTRACT:
Coupled quantum wells in which charge carriers shift from well to well by means of tunneling transfer. The quantum wells are created by disposing a material with lower carrier energy between layers of material with higher carrier energy. The spacing between wells is thin enough to allow tunneling transfer. The coupling of the wells displaces energy levels so that a system of N coupled wells has a spectrum of N energy levels. Under the proper conditions, transistions from one energy level to another result in the shift of charge carriers from one well to another. Because the tunneling transfer process is very fast, electronic devices capable of operating at terahertz frequencies are possible. Transistors, lasers, and detectors of electromagnetic radiation employing coupled quantum wells are disclosed.
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Crane Sara W.
James Andrew J.
Massachusetts Institute of Technology
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