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Suche nach „[W.] [Harth]“ hat 2 Publikationen gefunden
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    F: Elektrotechnik und Medientechnik

    Zeitschriftenartikel

    J. Freyer, W. Harth, Werner Bogner, M. Pöbl, M. Claassen

    GaAs transit-time diodes for D-band frequencies

    Electrical Engineering, vol. 78, pp. 257-259

    1995

    Abstract anzeigen

    Tunneling assisted GaAs avalanche transit-time diodes with oscillation frequencies between 140 and 170 GHz are presented. The device design results in a relatively low dc-voltage of 8 Volts. A non-alloyed Schottky contact instead of an ohmic contact on highly doped GaAs reduces losses at rf-frequencies. Cw-output power of 10 mW at 142 GHz and 1.3 mW at 170 GHz are attained in fundamental mode with devices on diamond heat-sinks. The diodes show an excellent noise behaviour resulting in a noise measure of only 26.5 dB at 170 GHz.

    F: Elektrotechnik und Medientechnik

    Zeitschriftenartikel

    W. Harth, Werner Bogner, L. Gaul, M. Claassen

    A comparative study on the noise measure of millimetre‑wave GaAs IMPATT diodes

    Solid-State Electronics, vol. 37, no. 3, pp. 427-431

    1994

    Abstract anzeigen

    It is theoretically and experimentally demonstrated that the small-signal noise measure of Gaas single-drift Impatt-diodes can efficiently be reduced by increasing the total width of the diode space-charge region due to shot-noise reduction and space-charge smoothing. For a total space-charge region width of 770 nm, a minimum noise-measure of 22 dB at 60 GHz is obtained. This value reaches almost the theoretical optimum noise measure of pin-avalanche diodes.