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The DDS Frequency Synthesizer for Mobile Communication

Jianjian Li

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Abstract

With the digital technology in recent years, Direct Digital Synthesis (DDS) technology had got development rapidly and been one of dominant frequency synthesis techniques. The hybrid frequency synthesis technique of DDS and PLL is employed in modern frequency synthesizer design widely, which combines higher resolution, fast switching time of DDS and higher output power, lower parasitic noise and spurious of PLL. This paper researches a hybrid frequency synthesizer for OFDM communication system based on DDS and PLL technology. The system scheme, circuit design and test results are presented. The output power was -5 dBm, phase noise in band reached -76 dBc/Hz@1kHz,frequency resolution was 1Hz and hopping speed was 10~4time/second. The experiment results show the performance meets the requirement of OFDM system.

About this research paper

What this paper is about

With the digital technology in recent years, Direct Digital Synthesis (DDS) technology had got development rapidly and been one of dominant frequency synthesis techniques. The hybrid frequency synthesis technique of DDS and PLL is employed in modern frequency synthesizer design widely, which combines higher resolution, fast switching time of DDS and higher output power, lower parasitic noise and spurious of PLL. This paper researches a hybrid frequency synthesizer for OFDM communication system based on DDS and PLL technology. The system scheme, circuit design and test results are presented. The output power was -5 dBm, phase noise in band reached -76 dBc/Hz@1kHz,frequency resolution was 1Hz and hopping speed was 10~4time/second. The experiment results show the performance meets the requirement of OFDM system.

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Available abstract

With the digital technology in recent years, Direct Digital Synthesis (DDS) technology had got development rapidly and been one of dominant frequency synthesis techniques. The hybrid frequency synthesis technique of DDS and PLL is employed in modern frequency synthesizer design widely, which combines higher resolution, fast switching time of DDS and higher output power, lower parasitic noise and spurious of PLL. This paper researches a hybrid frequency synthesizer for OFDM communication system based on DDS and PLL technology. The system scheme, circuit design and test results are presented. The output power was -5 dBm, phase noise in band reached -76 dBc/Hz@1kHz,frequency resolution was 1Hz and hopping speed was 10~4time/second. The experiment results show the performance meets the requirement of OFDM system.

Key concepts: Frequency synthesizer, Direct digital synthesizer, Phase-locked loop, Phase noise, Electronic engineering, dBc, PLL multibit, Frequency multiplier

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