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过去许多文献认为,IGO环(脉冲锁相环,即脉冲控制振荡器的缩写)难以扩展至微波段,其理由之一是同步脉冲宽度必须窄于VCO周期的1/3—1/5,在微波段较难实现。近来,虽有文献对此论点表示异议,但仍认为微波IGO(非理想取样保持)的同步脉冲宽度愈窄愈好。本文指出了上述观点的不足之处。文中还讨论了IGO的相位噪声和环路稳定性等问题。理论分析和3GHz IGO的实验均证实,一个正确设计的微波IGO,确具相位噪声小、稳定性好、工艺简便,结构紧凑等优点。
In the past, many literatures considered that one of the reasons that IGO rings (impulsive phase-locked loops, abbreviations for pulse-controlled oscillators) are difficult to extend to the microwave band is that one reason for this is that the sync pulse width must be narrower than 1 / 3-1 / 5 of the VCO cycle. The microwave section is harder to achieve. Recently, although the literature disagrees with this argument, it is still believed that the narrower and narrower the sync pulse width of microwave IGO (non-ideal sample and hold) is. This article points out the shortcomings of the above point of view. The article also discusses the IGO phase noise and loop stability and other issues. Theoretical analysis and 3GHz IGO experiments confirm that a correctly designed microwave IGO does have the advantages of small phase noise, good stability, simple process and compact structure.