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A Self Frequency Preset PLL Synthesizer
IEICE TRANSACTIONS on Communications
Publication Date: 1993/05/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Satellite Communications Networking and Applications)
PLL, synthesizer, preset, TDMA, frequency hopping,
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This paper proposes a self frequency preset (SFP) PLL synthesizer to realize a simple frequency preset PLL synthesizer with temperature-resistant and shorter frequency settling time than the conventional temperature un-compensated phase and frequency preset (PFP) PLL synthesizer. Since the proposed synthesizer employs a simple frequency locked loop (FLL) circuit to preset the output frequency at each frequency hopping period, the synthesizer eliminates the need to store f-V characteristic of the VCO in ROM. The frequency settling time of the proposed synthesizer is theoretically and experimentally analyzed. The theoretical analysis using the realistic f-V characteristic of a IF band VCO show that the frequency settling time of the proposed synthesizer is 130µs shorter than that of the conventional PFP PLL synthesizer at 40MHz hopping in the 200MHz band for all temperatures. Furthermore, the experimental results confirm that the frequency acquisition time of a prototype FLL circuit is accordant with the calculated results. Thus, the proposed SFP PLL synthesizer can achieve faster frequency settling than the conventional PFP PLL synthesizer for all temperatures and its simple configuration allows to be easily implemented with existing CMOS ASIC devices.