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广西师范大学学报(自然科学版) ›› 2019, Vol. 37 ›› Issue (4): 37-44.doi: 10.16088/j.issn.1001-6600.2019.04.004
谢丽娜, 蒋品群*, 宋树祥, 岑明灿
XIE Lina, JIANG Pinqun*, SONG Shuxiang, CEN Mingcan
摘要: 近年来,N通道滤波器被广泛应用于射频通信和认知无线电等多个领域中。为了降低滤波器的损耗和噪声,拓展其可调谐范围,本文通过在传统的一阶N通道滤波器中引入串联电感,并将其级联的方法,得到了一款低损耗低噪声宽调谐的高阶N通道滤波器。采用伴随网络法获得了高阶级联N通道滤波器的传递函数。伴随网络法的采用大大简化了传递函数的数学推导过程。TSMC 0.18 μm CMOS工艺下的 Cadence 仿真结果表明了传递函数的正确性。Cadence 仿真结果还表明,当电源电压为1.2 V时,高阶级联N通道滤波器中心频率可调范围为0.4~3.0 GHz,插入损耗为1.6 dB,回波损耗为11.6 dB,噪声系数为0.2~0.8 dB,与近年来发表的滤波器相比,综合性能有了较大的提升,可应用于高性能的接收机中。
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