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Advanced lumped-element filters for digital microwave power amplifiers

机译:用于数字微波功率放大器的高级集总元件滤波器

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In this paper, two compact lumped-element band pass reconstruction filters for digital microwave power amplifiers applications in the 800 MHz band 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 from 50 Omega, as required for proper amplifier operation. Both filters achieve an insertion loss of around 0.8 dB and an equiripple bandwidth of 240 MHz (trisection) and 290 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.
机译:本文介绍了两个紧凑的集总带通重建滤波器,用于800 MHz频段的数字微波功率放大器应用。该滤波器基于三分法和四重奏拓扑,包括交叉耦合,这些交叉耦合产生透射零以实现最大选择性,并且可以使用实际元素值进行设计。与常见的滤波器设计相比,输入阻抗特性在宽带条件下得到了优化,以保证放大器正常工作所需的值不同于50Ω。两个滤波器均实现了约0.8 dB的插入损耗和240 MHz(三等分)和290 MHz(四重奏)的等波纹带宽,并改善了带外抑制。结果表明,与传统上在功率放大器应用中使用的较简单的滤波器相比,使用新提出的滤波器可以在放大器的线性度和效率上取得显着改善。

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