Spectral theory application to the construction of new types of frequency synthesizers of millimeter waves made on the phase locked loops

At millimeter wave frequencies using digital units direct frequency synthesis systems is difficult [1]. So, synthesizers based on phase locked loop (PLL) systems with the samples are used here. PLL with samples can generate oscillations with rational frequency ratio without using frequency divider unit which used in standard systems [2] by using special pulse phase discriminator implemented on a "sample and memorization. Negative characteristics of the PLL with samples [2] is that if inaccurate tuning frequency synchronized oscillations is marked suppression of the main component of the spectrum and the enhancement of side components on the combination frequencies. This report describes the first phase of the spectral approach to the analysis of oscillations generated by the PLL with samples. It is shown that by using the spectral method can determine the boundaries of zones of synchronous regimes of the PLL with-samples in experiments, watching the destruction of the spectra generated oscillations approaching the boundary zones. A complete harmonic analysis of output oscillations and found the calculated ratio, with which to quantify the allowable level of side in the spectrum of output signals from the PLL with samples. The second phase examines the effect of shape of the input signal at the border zones of operating modes being entered into with the PLL with samples. The basic method of fouling control the spectrum under consideration in this work is the use of complex signals at the input of the system. In particular replacing the sinusoidal oscillstions in the oscillation composed of the shifts of atomic functions fup3 [3]. This has resulted in a significant expansion zones synchronized (workers) higher-order multiple modes compared to the use of harmonic oscillations as a reference (Fig. lb compare with la where the extended zone 1:2, 1:3, etc.).