以下为句子列表：
英文: The optimized design and performance of the circuit of sampling phase-locked frequency synthesizer in microwave high-stability frequency-synthesizing technology are researched for the high demand of microwave frequency source.
中文: 针对卫星电视接收机中微波高稳定本振源的要求，重点研究了取样锁相频率合成器电路的优化设计及性能。
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英文: Through the research of direct digital synthesizer (DDS) used as a divider in phase lock loop (PLL), a frequency synthesizer with small frequency resolution ratio and high purity frequency spectrum can be realized.
中文: 摘要通过对直接数字合成器在锁相环路中作为分频器应用的研究，使频率合成器可以在实现超细频率分辨率的同时达到高的频谱纯度。
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