Abstract
In this paper, the tunable wideband bandpass filter is designed, which is used in hybrid frequency synthesizer of PLL+DDS mixing in the outside of the feedback loop. The channels of tunable wideband bandpass filter is chosen by two ADGM1304 single-pole, four-throw (SP4T) MEMS switch. And they are integrated on a high-frequency board with a substrate of Ro4350B.The central frequency of bandpass filter is 2.32 GHz, 2.38 GHz, 2.44 GHz and 2.5 GHz respectively. A wideband filter with adjustable center frequency is designed and the bandwidth is up to 240 MHz. Finally, physical tests show the spurious components and unwanted spectral components, especially near-end spurs at the center frequency are removed basically by the tunable broadband bandpass filter.
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Zhou, Y., Cheng, S., Lei, X. (2020). Design the Tunable Wideband Filter for DDS+PLL Hybrid Frequency Synthesizer. In: Li, W., Tang, D. (eds) Mobile Wireless Middleware, Operating Systems and Applications. MOBILWARE 2020. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 331. Springer, Cham. https://doi.org/10.1007/978-3-030-62205-3_14
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DOI: https://doi.org/10.1007/978-3-030-62205-3_14
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