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通过对微波频率源相位噪声的分析,针对一个C波段微波频率源低相位噪声的要求,对比分析了直接倍频、数字锁相以及高频鉴相之后再倍频三种方案之间的相位噪声差别。最终得出采用直接在超高频(UHF)波段对输入信号进行模拟鉴相并锁定之后再倍频才能达到所要求的相位噪声指标。对制成的样品进行了测试,取得了预期的相位噪声指标。该C波段微波频率源的相位噪声可以达到:≤-120 dBc/Hz@1 kHz,≤-125 dBc/Hz@10 kHz,≤-130dBc/Hz@100kHz,≤-140 dBc/Hz@1 MHz。直接在UHF波段进行高频鉴相的技术,通过提高鉴相频率大幅降低了微波锁相频率源的相位噪声。
Based on the analysis of the phase noise of the microwave frequency source, aiming at the requirement of a low phase noise of a C-band microwave frequency source, the phase noise between the three schemes of direct multiplication, digital phase locking and high frequency demultiplexing is compared and analyzed. difference. Finally, it can be concluded that the required phase noise index can be achieved by multiplying the analog signal by phase-locking the input signal directly in the ultra-high frequency (UHF) band. The fabricated samples were tested and the expected phase noise index was obtained. The C-band microwave frequency source can achieve phase noise of ≤-120 dBc / Hz @ 1 kHz, ≤ -125 dBc / Hz @ 10 kHz, ≤-130 dBc / Hz @ 100 kHz, ≤-140 dBc / Hz @ 1 MHz. The technology of high-frequency phase discrimination directly in the UHF band greatly reduces the phase noise of the microwave phase-locked frequency source by increasing the phase frequency.