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Multiple time constant modeling of dispersion dynamics in hetero field-effect transistors
A new approach to the modeling of frequency dispersion effects encountered in the drain current characteristics of state-of-the-art hetero field-effect transistors is presented. The empirical, equivalent-circuit based model ...
Fully integrated millimeter-wave VCO with 32 % tuning range
In this paper, the authors present a fully integrated VCO with 32 % tuning range centered at 38.9 GHz. The VCO was designed using a commercially available, inexpensive 0.8 µm Si/SiGe HBT technology with fT and fmax of 80 ...
A unified approach to charge-conservative capacitance modelling in HEMTs
The voltage dependence of high electron mobility transistor (HEMT) gate-source- and gate-drain-capacitance is described by a set of equations based on a unified charge-conservative model approach. The model is applied to ...
A low-noise active receiving antenna using a SiGe HBT
Compact multilayer filter structures for coplanar MMICs
Transmission lines and passive elements for multilayer coplanar circuits on silicon
Some studies of quasi-planar antennas
(Universität Ulm, 2016-12-21)
Recent decades have witnessed the rapid evolution of wireless sensing and communication systems aimed at the consumer market. The antenna is a key component in any of these systems, and the selection criteria for a commercial ...
Millimeter-wave MEMS-loaded transmission-line phase shifters
(Universität Ulm, 2016-08-02)
Beam forming and scanning at microwave and millimetre-wave frequencies (1 GHz – 100 GHz) using electronic steerable array (ESA) antennas, requires phase shift and time-delay units. RF path phase shifters provide an attractive ...
A SiGe HBT low-power pulse generator for impulse radio ultra-wide band applications
In this paper a compact ultra-wide band (UWB) pulse generator using SiGe HBT technology is presented. The proposed circuit uses a simple circuitry to generate a current spike on chip, which in turn triggers an under-damped ...
Analog synchronous receiver for multi-gigabit wireless communications
In this work, we present a synchronous receiver architecture utilizing analog carrier recovery, to be used in multi-gigabit wireless communication systems. Carrier phase and frequency synchronization in the analog receiver ...