Research Article
Design the Tunable Wideband Filter for DDS+PLL Hybrid Frequency Synthesizer
@INPROCEEDINGS{10.1007/978-3-030-62205-3_14, author={Yuxin Zhou and Shaoting Cheng and Xuemei Lei}, title={Design the Tunable Wideband Filter for DDS+PLL Hybrid Frequency Synthesizer}, proceedings={Mobile Wireless Middleware, Operating Systems and Applications. 9th EAI International Conference, MOBILWARE 2020, Hohhot, China, July 11, 2020, Proceedings}, proceedings_a={MOBILWARE}, year={2020}, month={11}, keywords={Phase-lock-loop (PLL) Direct digital synthesis (DDS) Bandpass filter Mixer SP4T MEMS switch}, doi={10.1007/978-3-030-62205-3_14} }- Yuxin Zhou
Shaoting Cheng
Xuemei Lei
Year: 2020
Design the Tunable Wideband Filter for DDS+PLL Hybrid Frequency Synthesizer
MOBILWARE
Springer
DOI: 10.1007/978-3-030-62205-3_14
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.
