Розробка каскадних помножувачів частоти для цифрового генератора на базі прямого методу синтезу частоти
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Файли
Дата
2018
Автори
Петрушак, В.С.
Petrushak, V.S.
Назва журналу
Номер ISSN
Назва тому
Видавець
Хмельницький національний університет
Анотація
Запропонований спосіб каскадного перемноження частоти для цифрового генератора періодичних
сигналів на базі прямого методу синтезу частоти. Розроблено функціональні схеми каскадних помножувачів
частоти на 2, 4 і 15. Представленні осцилограми, які підтверджують працездатність розроблених каскадних
помножувачів частоти. Запропонований варіант функціональної схеми цифрового генератора періодичних
сигналів на базі прямого метода синтезу частоти з використанням схеми каскадного помноження частоти.
Modern synthesizers based on direct synthesis of frequency are used in many areas of radio engineering. At the same time, such synthesizers are characterized by all the disadvantages of digital signal processing devices: quantization noise, overlaying of spectra of a digital signal, limited upper operating frequency. An important factor for the direct method of frequency synthesis is the value of the clock frequency. Accordingly, the higher the value of the clock frequency, the higher the value of the frequency of the periodic signal at the output of the digital generator. Modern industry produces a wide range of external oscillator generators. However, most of them work at frequencies up to 100 MHz. Outdoor clock generators operating at frequencies above 100 MHz are expensive and require solving electromagnetic compatibility issues, which also leads to an increase in the cost of the device. One solution to this problem is hardware frequency multiplication. The method of direct digital frequency synthesis for the generation of periodic signals has been improved. The method of cascade frequency multiplication for a digital periodic signal generator based on the direct method of frequency synthesis is proposed. The functional schemes of cascade frequency multipliers for 2, 4 and 15 are developed. The developed multipliers are assembled on the formers of short pulses made on the basis of D-triggers. However, such a formwork may be an element of delay. Representation of oscillograms, which confirm the performance of the developed cascade frequency multipliers. The proposed version of the functional scheme of the digital generator of periodic signals based on the direct method of frequency synthesis using the cascade frequency multiplication scheme.
Modern synthesizers based on direct synthesis of frequency are used in many areas of radio engineering. At the same time, such synthesizers are characterized by all the disadvantages of digital signal processing devices: quantization noise, overlaying of spectra of a digital signal, limited upper operating frequency. An important factor for the direct method of frequency synthesis is the value of the clock frequency. Accordingly, the higher the value of the clock frequency, the higher the value of the frequency of the periodic signal at the output of the digital generator. Modern industry produces a wide range of external oscillator generators. However, most of them work at frequencies up to 100 MHz. Outdoor clock generators operating at frequencies above 100 MHz are expensive and require solving electromagnetic compatibility issues, which also leads to an increase in the cost of the device. One solution to this problem is hardware frequency multiplication. The method of direct digital frequency synthesis for the generation of periodic signals has been improved. The method of cascade frequency multiplication for a digital periodic signal generator based on the direct method of frequency synthesis is proposed. The functional schemes of cascade frequency multipliers for 2, 4 and 15 are developed. The developed multipliers are assembled on the formers of short pulses made on the basis of D-triggers. However, such a formwork may be an element of delay. Representation of oscillograms, which confirm the performance of the developed cascade frequency multipliers. The proposed version of the functional scheme of the digital generator of periodic signals based on the direct method of frequency synthesis using the cascade frequency multiplication scheme.
Опис
Ключові слова
цифровий генератор, періодичний сигнал, прямий метод синтезу частоти, цифро- аналогове перетворення, digital generator, periodic signal, direct digital synthesis, digital-to-analogue conversion
Бібліографічний опис
Петрушак, В.С. Розробка каскадних помножувачів частоти для цифрового генератора на базі прямого методу синтезу частоти [Текст] / В. С. Петрушак // Вісник Хмельницького національного університету. Технічні науки. – 2018. – №2. – С. 248-251.