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- W2032897631 abstract "Based on the design guidelines for low-noise HBTs which is derived from Hawkins' model, an AlGaAs/GaAs HBT with emitter-ledge passivation is fabricated for low frequency applications. This HBT increases the current gain, especially at low collector current densities--a key device parameter that impacts the noise figure at low frequencies. An NF<SUB>min</SUB> of 0.6 dB with an G<SUB>a</SUB> of 17.7 dB is obtained for an HBT with 2.5- X 20-micrometers X 2 emitters at 2 GHz. An AlGaAs/InGaAs HBT with regrown base contacts is also fabricated to reduce the base transit time and the base resistance, without increasing the emitter junction capacitance, for higher frequency low-noise applications. This HBT achieves an NF<SUB>min</SUB> of 1.2 dB with a G<SUB>a</SUB> of 10.3 dB and an NF<SUB>min</SUB> of 1.7 dB with a G<SUB>a</SUB> of 8.7 dB at 12 and 8 GHz, respectively, and can be useful at low frequencies as well, due to a low equivalent noise resistance that make noise matching easier." @default.
- W2032897631 created "2016-06-24" @default.
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- W2032897631 date "1999-12-13" @default.
- W2032897631 modified "2023-09-23" @default.
- W2032897631 title "<title>Microwave noise characteristics of GaAs-based HBTs</title>" @default.
- W2032897631 doi "https://doi.org/10.1117/12.373007" @default.
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