Розробка цифрового генератора періодичних сигналів на базі прямого методу синтезу частоти і дослідження роботи його функціональних блоків
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Файли
Дата
2017
Автори
Петрушак, В.С.
Самолюк, С.В.
Petrushak, V.S.
Samoluk, S.V.
Назва журналу
Номер ISSN
Назва тому
Видавець
Хмельницький національний університет
Анотація
Запропоновано структурну схему та наведено опис роботи цифрового генератора періодичних сигналів
на базі прямого методу синтезу частоти. Досліджено роботу функціональних блоків, що увійшли до складу
цифрового генератора: суматора, регістра, подільника частоти, реверсивного лічильника, таблиці
перекодування, схеми керування, цифроаналогового
перетворювача. Представлені осцилограми, які
підтверджують працездатність функціональних блоків.
The main purpose of the digital oscillator is the formation of periodic signals of various shapes. Modern digital oscillators based on the direct method of frequency synthesis operate in the range from a fraction of hertz to tens and hundreds of gigahertz. They are used in equipment of different function, replacing it with simple autooscillators. At the same time, such oscillators are characterized by all the disadvantages of digital signal processing devices: quantization noise, overlaying of spectra of a digital signal, limited upper working frequency. Therefore, the development of digital oscillators of periodic signals based on the direct method of frequency synthesis using multipliers that would occupy an intermediate position among the known and characterized by a simple and nonexpensive implementation scheme is today relevant. A structural scheme is proposed and a description of the operation of the digital oscillator of periodic signals based on the direct method of frequency synthesis is given. In the structural scheme: the clock oscillator, forms a sequence of rectangular pulses of a certain frequency; frequency divider, divides the clock frequency by 1024; multiplier multiplies the clock frequency by 4 times; reverse counter, forms a binary code; the register keeps a certain value of the binary code; Adder adds binary codes that come from the register and the reverse counters; control scheme, sets the form of the periodic signal; digital transcripts of a sinusoidal, rectangular or pollen signal are stored in the transcoding table; the digitaltoanalogue converter converts the binary value of the periodic signal to a certain value of current. The work of functional blocks included in the digital generator: adder, register, frequency divider, reversing counter, transcoding tables, control circuits, digitaltoanalogue converter were investigated. Presenting oscillograms, which confirm the functional capacity of the functional units. Digital part of the circuit of the digital generator is made on the programmable logic integrated circuit of the series Cyclone III EP3C5E144C8. The multiplier uses the ALTPLL megapixel, which is a block of phaselocked loops.
The main purpose of the digital oscillator is the formation of periodic signals of various shapes. Modern digital oscillators based on the direct method of frequency synthesis operate in the range from a fraction of hertz to tens and hundreds of gigahertz. They are used in equipment of different function, replacing it with simple autooscillators. At the same time, such oscillators are characterized by all the disadvantages of digital signal processing devices: quantization noise, overlaying of spectra of a digital signal, limited upper working frequency. Therefore, the development of digital oscillators of periodic signals based on the direct method of frequency synthesis using multipliers that would occupy an intermediate position among the known and characterized by a simple and nonexpensive implementation scheme is today relevant. A structural scheme is proposed and a description of the operation of the digital oscillator of periodic signals based on the direct method of frequency synthesis is given. In the structural scheme: the clock oscillator, forms a sequence of rectangular pulses of a certain frequency; frequency divider, divides the clock frequency by 1024; multiplier multiplies the clock frequency by 4 times; reverse counter, forms a binary code; the register keeps a certain value of the binary code; Adder adds binary codes that come from the register and the reverse counters; control scheme, sets the form of the periodic signal; digital transcripts of a sinusoidal, rectangular or pollen signal are stored in the transcoding table; the digitaltoanalogue converter converts the binary value of the periodic signal to a certain value of current. The work of functional blocks included in the digital generator: adder, register, frequency divider, reversing counter, transcoding tables, control circuits, digitaltoanalogue converter were investigated. Presenting oscillograms, which confirm the functional capacity of the functional units. Digital part of the circuit of the digital generator is made on the programmable logic integrated circuit of the series Cyclone III EP3C5E144C8. The multiplier uses the ALTPLL megapixel, which is a block of phaselocked loops.
Опис
Ключові слова
цифровий генератор, періодичний сигнал, прямий метод синтезу частоти, цифроаналогове перетворення, digital oscillator, periodic signal, direct digital synthesis, digitaltoanalogue conversion
Бібліографічний опис
Петрушак, В.С. Розробка цифрового генератора періодичних сигналів на базі прямого методу синтезу частоти і дослідження роботи його функціональних блоків [Текст] / В. С. Петрушак, С. В. Самолюк // Вісник Хмельницького національного університету. Технічні науки. – 2017. – № 6. – С. 187-190.