Research and Design of PN Code Sequence Fast Frequency Hopping Frequency Synthesizer
Wen Dong Yang · Journal of Institute of Command and Technology · 2001
Military frequency hopping communication systems must have fast frequency hopping rate and lower phase noise and lower spurious frequency synthesizer for high performance against interference. This paper introduces pseudo-noise (PN) code sequence fast frequency hopping frequency synthesizer, which is based on DDS/PLL hybrid frequency synthesizer. The output frequencies of this frequency synthesizer vary according to pseudo-noise code sequence quickly. The output frequency range is 350 MHz~510 MHz, the phase noise and spurious of this frequency synthesizer is lower than -90dBC/Hz/1kHz and -60dB separately. This frequency synthesizer can be applied in frequency hopping communication systems, and it can improve the ability of communication system against interference.