Reduction of the Phase Noise Level of Heterodynes of Modern Spectrum Analyzers Using Fundamental Frequency Images of Direct Digital Synthesizers

详细

A hybrid frequency synthesizer ins developed in which fundamental frequency images of a direct digital synthesizer are used to improve noise characteristics. It is shown that this synthesizer can generate a wide range of output frequencies with a small step size adjustment. Mathematical modeling of the noise characteristics of the synthesizer and comparison with the noise characteristics of heterodynes of modern spectrum analyzers are carried out.