An extremely wide band balanced amplitude controller in coplanar waveguide technology
- 1 September 1995
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2, 921-925
- https://doi.org/10.1109/euma.1995.337096
Abstract
A versatile amplitude controller is presented, which is intended for phased array applications or QAM-modulators operating directly at the desired radio frequency. Due to the small geometry and the 0.2 μm GaAs/GaAIAs HEMT technology, a bandwidth from 15 to 60 GHz could be achieved. Coplanar waveguides and lumped elements were used as passive circuit elements. The main topology consists of a differential amplifier and a coplanar balun. The control voltages of the differential amplifier are applied in a push-pull scheme. The balun operates as 180°-power combiner and subtracts both RF-signals. In this way, the common mode is rejected and the phase of the output signal changes by 180°, when the amplitude crosses zero.Keywords
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