Browsing by Author "Bischof, Werner"

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    Modelling and realization of a monolithic 27 GHz HEMT amplifier in coplanar waveguide technology
    (1990) Bischof, Werner; Ehrlinger, Wolfgang; Berroth, Manfred; Reinert, Werner
    A monolithic integrated amplifier in HFET-Technology for the 27 GHz band is presented, fitted for the use in digital radio link front ends with dedicated in- and out-of-band specifications. The amplifier consists of two stages of 0.5 μm HFETs and some passive circuitry for matching, biasing and gain stabilizing. Coplanar waveguides and lumped elements like thinfilm resistors, MIM-capacitors and spiral inductors were used. All passiv and active components were measured separately and the derived circuit models were placed into a CAD-library.
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    A monolithic HEMT-amplifier with feedback in coplanar waveguide technology
    (1992) Bischof, Werner; Ehrlinger, Wolfgang; Berroth, Manfred; Reinert, Werner
    A monolithic integrated wide-band amplifier is presented, which consists of two 0.3 μm HEMT-stages in GaAs/GaAlAs-Technology. The main signal path consists of a coplanar waveguide, which interfaces conveniently to the HEMT-cells. A feedback circuit with R, L and C connects gate and drain. To close the feedback loop small scale microstrip lines were combined with CPW /1, 2, 4/. Matching is done with a LC circuit at the gate and a combination of transmission line and capacitor at the drain. In addition there are some other passive elements for biasing, which reduce external components to a minimum. All element models were checked with measured data and placed into a CAD-library for easy use in the design process.