CAJ | 학술논문

本文鉴于数字锁相环在实际应用中对信号频率的准确度和稳定度有较为严格的要求,设计一种应用于数字锁相环的数控振荡器（NCO,Number Controlled Oscillator）。基于直接数字频率合成（DDS）技术,介绍NCO工作原理,基于FPGA实现NCO,关键是相位累加器与波形存储器两个模块的设计,并利用QUARTUS对设计结果进行编译仿真。对NCO杂散信号进行频谱分析,并提出解决方法。该设计有效抑制杂散,修改灵活,便于调试,在数字锁相环设计中可有广泛应用。
본문감우수자쇄상배재실제응용중대신호빈솔적준학도화은정도유교위엄격적요구,설계일충응용우수자쇄상배적수공진탕기（NCO,Number Controlled Oscillator）。기우직접수자빈솔합성（DDS）기술,개소NCO공작원리,기우FPGA실현NCO,관건시상위루가기여파형존저기량개모괴적설계,병이용QUARTUS대설계결과진행편역방진。대NCO잡산신호진행빈보분석,병제출해결방법。해설계유효억제잡산,수개령활,편우조시,재수자쇄상배설계중가유엄범응용。
Based on the high standard for veracity and stability of signal frequency applied in digital PLL,a kind of NCO（Number Controlled Oscillator） is designed applied in digital PLL.Based on DDS（Direct Digital Frequency Synthesizers）,the basic principle of NCO is introduced,NCO is realized based on FPGA.The key point is how to design phase accumulator and ROM,the design result is complied and simulated with applied software tool QUARTUS.The frequency spectrum of NCO is analyzed,and the resolve measure is given.This design can control spurious,modify conveniently,it has widely application in design of digital PLL.