摘要
随着移动通信、雷达、测试仪器等领域的快速发展,低成本、高性能、小体积的频率合成器一直是设计的难点。介绍了1种混合频率合成方案,避免了单环通过简单倍频产生的相噪恶化。采用AD9858实现频率高分辨率,利用可变带宽实现环路快速锁定,使用三级不同带宽的滤波器对环路中的相位噪声、谐波分量等进行抑制。通过最后的实验测试,输出信号在频率2.825 GHz时的相位噪声为:-105 dBc@1 kHz、-106 dBc@10 kHz,杂散抑制为-61 dBc。实验结果满足高性能混合频率合成器的设计指标。
With mobile communication,radar,test equipment,and other areas of rapid development,low-cost,high performance,small size of the frequency synthesizer has been the design of the difficulties.This research presents a hybrid synthesizer programs,avoid deterioration of phase noise that single-ring generated by a simple harmonic.In this paper,AD9858 achieve frequency high resolution,loop,which use the variable bandwidth,achieve rapid locking,with three different bandwidth filters suppress the loop phase noise and harmonic components.By the final experimental test,phase noise of output signal is at 2.825 GHz：-105 dBc@1 kHz,-106 dBc@10 kHz,and spurious rejection is-61 dBc.The results meet the design standard of mixed-frequency synthesizer with low-cost high-performance.
出处
《电子测量技术》
2011年第8期10-12,66,共4页
Electronic Measurement Technology
基金
新一代宽带无线移动通信网科技重大专项(2009ZX03001-005-01)资助项目
关键词
频率合成
高性能
环路滤波器
VCO
frequency synthesizer
high-performance
loop filter
VCO
