Abstract
In this paper, two compact lumped-element band pass reconstruction filters for digital microwave power amplifiers applications in the800 MHzband are presented. The filters, based on the trisection and quartet topologies, include cross-couplings which produce transmission zeros for maximum selectivity, and can be designed with practical element values. In contrast to common filter designs the input impedance characteristic is optimized broadband to values different from50 Ω, as required for proper amplifier operation. Both filters achieve an insertion loss of around0.8 dBand an equiripple bandwidth of240 MHz (trisection)and290 MHz (quartet), respectively, with improved out-of-band suppression. Results show that a considerable improvement in amplifier linearity and efficiency can be obtained with the new proposed filters, as compared with simpler filters traditionally used in power amplifier applications.
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