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    Inverse Mode Sige HBT Cascode Device And Fabrication Method

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    8212291.pdf (435.8Kb)
    Date
    7/3/2012
    Author
    Thrivikraman, Tushar K.
    Appaswamy, Aravind
    Cressler, John D.
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    Abstract
    Disclosed is a device structure using an inverse-mode cascoded Silicon-Germanium (SiGe) Heterojunction Bipolar Transistor (HBT) beneficial in applications requiring radiation hardened circuitry. The device comprises a forward-mode common-emitter HBT cascoded with a common-base inverse-mode HBT, sharing a common sub-collector. An exemplary device was measured to have over 20 dB of current gain, and over 30 dB of power gain at 10 GHz, thus demonstrating the use of these circuits for high-frequency circuit applications. In addition, the radiation response and voltage limits were characterized and showed to have negligible performance effects in typical operating conditions. Due to the unique topology, the disclosed device has the benefit of being a more compact cascode design and the additional benefit of providing significantly improved radiation tolerance.
    URI
    http://hdl.handle.net/1853/58055
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