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GaAs transit-time diodes for D-band frequencies

GaAs Laufzeitdioden für D-Band Frequenzen

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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.

Übersicht

In dieser Arbeit werden GaAs-Laufzeitbauelemente für den Frequenzbereich von 140 GHz bis 170 GHz beschrieben, bei denen die Ladungsträgergeneration durch tunnelstromunterstützte Lawinenmultiplikation erreich wird. Der Bauelemententwurf resultiert in einer relativ niedrigen Betriebsspannung von 8 Volt. Die Verluste im Bauelement konnten durch die Verwendung eines nicht legierten Schottky-Kontakts auf hochdotiertem GaAs-Material anstelle eines ohmschen Kontakts merklich reduziert werden. Für Bauelemente auf Diamantwärmesenken konnten Hochfrequenzausgangsleistungen von 10 mW bei 142 GHz und 1,3 mW bei 170 GHz im Grundwellenmodus erzielt werden. Die Dioden zeigen ein sehr gutes Rauschverhalten mit einem Rauschmaß von nur 26,5 dB bei 170 GHz.

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Freyer, J., Harth, W., Bogner, W. et al. GaAs transit-time diodes for D-band frequencies. Electrical Engineering 78, 257–259 (1995). https://doi.org/10.1007/BF01240231

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