Advanced Lumped-Element Trisection Filter for Digital Microwave Power Amplifiers
M. Martinez-Mendoza1, A. Wentzel1, W. Heinrich1, A. Alvarez Melcon2
Published in:
Proc. 44th European Microwave Conf. (EuMC 2014), Rome, Italy, Oct. 6-9, pp. 548-551 (2014).
Abstract:
In this paper, a compact lumped element bandpass reconstruction filter for digital microwave power amplifier applications in the 800 MHz band is presented. The filter, based on the trisection topology, includes a cross coupling which produces a transmission zero for maximum selectivity. In contrast to common filter designs the input impedance characteristic is optimized broadband to values different from 50 &Omega, as is required for proper amplifier operation. The filter achieves an insertion loss of 0.8 dB and an equiripple bandwidth of 240 MHz, with improved out-of-band suppression.
1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
2 Technical University of Cartagena Antiguo Cuartel de Antigones, Campus Muralla del Mar s/n ES-30202 Cartagena, Murcia, Spain
Index Terms:
Filters, lumped, power amplifiers, digital, classD, class S.
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