TY - JOUR

T1 - Frequency and power limit of quantum well oscillators

AU - Jogai, B.

AU - Wang, K. L.

AU - Brown, K. W.

N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.

PY - 1986

Y1 - 1986

N2 - The maximum frequency at which amplification can be obtained from quantum well oscillators is discussed. Intrinsically, the frequency limit for having negative differential resistance (NDR) can be very high, of the order of the inverse of the electron transit time. Owing to the large capacitance of the well and barrier regions, the actual frequency limit at which amplification occurs may be lower than the intrinsic limit because of the capacitance charging time. We have estimated the frequency limit of NDR by considering the electron transit time and have calculated the maximum oscillation frequency from an equivalent circuit model. We have also obtained an expression for the high-frequency power output as a function of frequency, based on a transmission line model.

AB - The maximum frequency at which amplification can be obtained from quantum well oscillators is discussed. Intrinsically, the frequency limit for having negative differential resistance (NDR) can be very high, of the order of the inverse of the electron transit time. Owing to the large capacitance of the well and barrier regions, the actual frequency limit at which amplification occurs may be lower than the intrinsic limit because of the capacitance charging time. We have estimated the frequency limit of NDR by considering the electron transit time and have calculated the maximum oscillation frequency from an equivalent circuit model. We have also obtained an expression for the high-frequency power output as a function of frequency, based on a transmission line model.

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U2 - 10.1063/1.96617

DO - 10.1063/1.96617

M3 - Article

AN - SCOPUS:36549093008

VL - 48

SP - 1003

EP - 1005

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 15

ER -