scholarly journals Flexible Ultra-Wide Electro-Optic Frequency Combs for a High- Capacity Tunable 5G+ Millimeter-Wave Frequency Synthesizer

2021 ◽  
Vol 11 (22) ◽  
pp. 10742
Author(s):  
Li Liu ◽  
Yangguang Liu ◽  
Xiao-Zhi Gao ◽  
Xiaomin Zhang
Keyword(s):  
Phase Noise ◽  
Millimeter Wave ◽  
Frequency Synthesizer ◽  
Frequency Comb ◽  
High Capacity ◽  
Wave Frequency ◽  
Ultra Wideband ◽  
Tone Frequency ◽  
Electro Optic ◽  
Tunable Frequency

This paper presents a new scheme of a cost-effective tunable millimeter-wave (MMW) frequency synthesizer based on an ultra-wideband electro-optic frequency comb. The architecture for the quasi-tunable millimeter-wave frequency synthesizer mainly consists of a compact ultra-wide flat electro-optic frequency comb and a multi-tone frequency generator, which only includes a quantum dot mode-locked laser, a LiNbO3 dual-driving Mach–Zehnder modulator (DD-MZM) and Uni-traveling-carrier photodiode (UTC-PD). MMW signals generated with a quasi-tunable frequency are experimentally demonstrated. The difference in power is obtained for the different frequencies. The linewidth of the quasi-tunable frequency signals is less than 273 Hz. In addition, the single side band (SSB) phase noise of the 25, 37.5, 50 and 75 GHz is measured as −115, −106, −102 and −95 dBc/Hz at an offset of 1 kHz, respectively. The proposed frequency synthesizer has ultra-low phase noise, quasi-tunable frequency and simple structure. The research results of the frequency synthesizer are applied for 5G+ transmission with radio wave working at K-band and V-band. The flexible, compact and robust MMW frequency synthesizer is suitable for the future of ultra-high capacity 5G+ communication.

scholarly journals A Phase Noise Analysis Method for Millimeter-Wave Passive Imager BHU-2D-U Frequency Synthesizer

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Jin Zhang ◽  
Cheng Zheng ◽  
Xianxun Yao ◽  
Baohua Yang
Keyword(s):  
Phase Noise ◽  
Millimeter Wave ◽  
Error Control ◽  
Frequency Synthesizer ◽  
Noise Analysis ◽  
Phase Error ◽  
Intermediate Frequency ◽  
Analysis Method ◽  
Noise Effects ◽  
Offset Frequency

A nontrivial phase noise analysis method is proposed for frequency synthesizer of a passive millimeter-wave synthetic aperture interferometric radiometer (SAIR) imager for concealed weapon detections on human bodies with high imaging rates. The frequency synthesizer provides local oscillator signals for both millimeter-wave front ends and intermediate frequency IQ demodulators for the SAIR system. The influence of synthesizer phase noise in different offset frequency ranges on the visibility phase errors has been systematically investigated with noise requirements drawn, and the integrated RMS phase error could represent uncorrelated phase noise effects in the most critical offset frequency range for visibility error control. An analytical phase noise simulation method is proposed to guide synthesizer design. To conclude, the phase noise effects on SAIR visibility errors have been concretized to noise design requirements, and good agreements have been observed between simulation and measurement results. The frequency synthesizer designed has been successfully in operation in BHU-2D-U system.

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