A Passive Tunable Matching Filter for Multiband RF Applications Demonstrated at 7 to 14 GHz
A Passive Tunable Matching Filter for Multiband RF Applications Demonstrated at 7 to 14 GHz
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DOI：
10.1109/lmwc.2017.2724006
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发表时间：
2017-07
影响因子：
3
通讯作者：
Paul Stärke;D. Fritsche;C. Carta;F. Ellinger
中科院分区：
文献类型：
--
作者：
Paul Stärke;D. Fritsche;C. Carta;F. Ellinger
这封信提出了一种为多频带射频应用实现宽带可调谐匹配滤波器的通用方法。该概念针对两级双极放大器进行了演示，以实现高达 50 ${\Omega }$ 的可调谐输入和输出小信号匹配。滤波器实现为 $\pi $ 网络，具有两个固定电感器和一个基于 CMOS 开关的 4 位数字调谐电容器。所采用的技术是 130 nm SiGe BiCMOS 工艺。测量证实了 7–14 GHz 的总频率调谐范围，具有至少 8 dB 回波损耗和 16.5–20 dB 增益，并且与理论预测和仿真结果非常吻合。此外，推导了所提出网络的紧凑分析理论，以将该方法扩展到任意频率和带宽。
This letter presents a general approach to implement a wideband tunable matching filter for multiband radio-frequency applications. The concept is demonstrated for a two-stage bipolar amplifier to achieve a tunable input and output small-signal match to 50 ${\Omega }$ . The filters are realized as $\pi $ -networks with two fixed inductors and a 4-bit digitally tuned capacitor based on CMOS switches. The utilized technology is a 130-nm SiGe BiCMOS process. A total frequency tuning range of 7–14 GHz with at least 8-dB return loss and 16.5–20 dB gain is confirmed by measurements and aligns well with the theoretical predictions and simulation results. In addition, a compact analytic theory for the proposed network is derived to extend this approach to arbitrary frequencies and bandwidths.