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Design of PLL Frequency Synthesizer Based on DDS

Shi Songsheng

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Abstract

In this paper,a frequency synthesizer based on DDS is discussed.The DDS mixed with the VCO output in the PLL feedback path and take the place of low-frequency loop of the multi-PLL,frequency range of the synthesizer is 89.6~110.4 MHz,resolution is 1 Hz and keep the spur of DDS.The synthesizer used the fast frequency switch ability of DDS and the loop trace ability of PLL to realize fast jump of signal.Main technical specification and key circuit are discussed.Finally,test results are given.

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What this paper is about

In this paper,a frequency synthesizer based on DDS is discussed.The DDS mixed with the VCO output in the PLL feedback path and take the place of low-frequency loop of the multi-PLL,frequency range of the synthesizer is 89.6~110.4 MHz,resolution is 1 Hz and keep the spur of DDS.The synthesizer used the fast frequency switch ability of DDS and the loop trace ability of PLL to realize fast jump of signal.Main technical specification and key circuit are discussed.Finally,test results are given.

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Available abstract

In this paper,a frequency synthesizer based on DDS is discussed.The DDS mixed with the VCO output in the PLL feedback path and take the place of low-frequency loop of the multi-PLL,frequency range of the synthesizer is 89.6~110.4 MHz,resolution is 1 Hz and keep the spur of DDS.The synthesizer used the fast frequency switch ability of DDS and the loop trace ability of PLL to realize fast jump of signal.Main technical specification and key circuit are discussed.Finally,test results are given.

Key concepts: Phase-locked loop, Frequency synthesizer, Direct digital synthesizer, PLL multibit, Voltage-controlled oscillator, Computer science, Electronic engineering, Loop (graph theory)

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