Frequency synthesis system for enhancing spectrum purity of direct digital frequency synthesizer
A frequency synthesizer, frequency synthesis technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of low signal spurious suppression, high cost, etc., and achieve the effect of high-quality signal synthesis
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[0017] The present invention will be further described below in conjunction with the drawings and embodiments.
[0018] Such as figure 1 As shown, a frequency synthesis system for improving the spectral purity of a direct digital frequency synthesizer includes a crystal oscillator OSC, a phase-locked loop module PLL, a direct digital frequency synthesis module DDS, a filter module, and a central processing unit. The crystal oscillator OSC provides the system clock for the frequency synthesis system. The signal output terminal of the crystal oscillator OSC is connected to the reference clock signal input terminal of the phase-locked loop module PLL, and the variable clock signal output terminal of the phase-locked loop module PLL is connected to the direct digital The variable clock signal input end of the frequency synthesis module DDS is connected, and the control signal input ends of the direct digital frequency synthesis module DDS and the phase-locked loop module PLL are respe...
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