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Harmonic signal frequency dividers allow for attainment of stable low-frequency oscillations at relatively high frequency of reference generator output signal. However, such frequency dividers comprise various filters that cannot fully suppress side harmonics. The use of low-pass filter has a major effect on device operation speed in transient modes. Additionally, most frequency dividers have integer-valued division ratio without possibility of its smooth control. In this work, the principles of construction and operation of existing harmonic signal frequency dividers, their applications and their main disadvantages are described. A new principle of harmonic signal frequency division is proposed, based on a phase change of the input signal within 360° by means of a phase shifter that is controlled by an alternating decreasing sawtooth voltage with amplitude equal to the input signal amplitude. The development and research of frequency dividers implementing the proposed principle were carried out by structural design and computer simulation. The block diagrams of frequency dividers are presented. Simulation models of the developed frequency dividers were compiled in the Mathlab & Simulink environment and oscillograms of their operation were obtained, confirming their operability and the correctness of the choice of technical solutions. A controlled harmonic frequency divider has been developed, having a high speed, a low level of side harmonics and adjustable division ratio that can reach 100, including non-integral values.
Evgeny B. Kolesnikov
Novomoskovsk Institute of Mendeleev Russian Technical University (Russia, 301665, Tula region, Novomoskovsk, Druzhby st., 8)

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