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Controll Module for Circuits with ADF4360 and Selected DDS
Lambor, Jiří ; Vágner, Petr (referee) ; Urbanec, Tomáš (advisor)
This bachelor’s thesis is focused on issues of communication between microprocessor unit and frequency synthesizer circuits - direct digital synthesis circuit (DDS), voltage control oscillator with phase lock loop (ADF). The basic theoretical function of DDS, ADF and SPI interface is described in the introduction. The solution and drafts of modules hardware are shown in next chapter. Last chapter describes programming of DDS and ADF circuits with examples of this code in C language. Schemes and board layouts of modules are attached in appendix.
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Laboratory waveform generator based on DDS
Kret, Tomáš ; Povalač, Aleš (referee) ; Šebesta, Jiří (advisor)
The project concerns about design of function generator based on direct digital synthesis, its software and hardware realisation. It solves generating functions depended on time like sine, triangle and square with variable duty cycle, burst and other functions of frequency sweep, FM and PWM modulation. Next goal is to display user interface on graphic LCD display and to control microcontroler pheripheries of AVR.
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Digitally controlled triangle-, square- and harmonic wave generator
Bradáč, Lubomír ; Koton, Jaroslav (referee) ; Vrba, Kamil (advisor)
Feasible solutions of digitally controlled triangle-, square- and harmonic wave generators are described in this bachelor´s thesis. There is general description of wave generators at the beginning. We can divide the wave generators to two groups. The first group of them are Arbitrary Waveform Generators and the next group is presenting Arbitrary Function Generators which are working with Direct Digital Synthesis. There are descriptions of their features, possibility of using, advantages and disadvantages in bachelor´s thesis. Of consequence part there are plug-in cards which are used as functional generators and multifunction cards. Their principal characteristics are described in relevant chapter. The most important part of this bachelor´s thesis is suggestion of digitally controlled triangle-, square- and harmonic wave generator which make use microcontroller of company ATMEL. You can find the process of execution, description its features and controlling program in the last chapter. All of measured results are saved in compact disc which is part of bachelor´s thesis.
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Laboratory waveform generator based on DDS
Kret, Tomáš ; Povalač, Aleš (referee) ; Šebesta, Jiří (advisor)
The project concerns about design of function generator based on direct digital synthesis, its software and hardware realisation. It solves generating functions depended on time like sine, triangle and square with variable duty cycle, burst and other functions of frequency sweep, FM and PWM modulation. Next goal is to display user interface on graphic LCD display and to control microcontroler pheripheries of AVR.
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Precise Frequency Generator - DDS
Kratochvíl, Petr ; Vágner, Petr (referee) ; Baran, Ondřej (advisor)
This work deals with frequency generators based on the direct digital synthesis method DDS. Basic principles and attributes of the frequency generator DDS are explained. The text describes parameters influencing and defining a quality of the generated signal. The list of available integrated circuits realizing the direct digital synthesis is mentioned. A construction of the DDS generator with a device AD9954 and the generator control are described. At the end of the work, the function and parameters of the designed generator are verified.
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Laboratory Function Generator
Trnkus, Andrej ; Kubíček, Michal (referee) ; Šebesta, Jiří (advisor)
This thesis deals with the design of function generators based on direct digital synthesis. It examines software and hardware realisation of a generator of sinus, triangle and rectangle shaped signal, frequency sweep, pulse-width modulation and data transfer after the SPI data bus. It also focuses on the user interface display on an LCD display, control by a rotational encoder and the buttons of the microcontroller periphery of an AVR class.
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Communication Systems with Digital Modulations
Spáčil, Jan ; Kubánek, David (referee) ; Číž, Radim (advisor)
The purpose of this semestral project is to explain the basic issues of simple digital modulations through the creation of simple digital modulations using direct digital synthesis. It begins with a short review of digital modulation theory and the theory about direct digital synthesis. All the technical documentation is attached, including schematics and boards of functional modulator.
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Direct digital synthesizerfor microwave application
Dluhý, Vojtěch ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
The aim of this thesis is introduce readers to the basics of digital frequency synthesis and design of direct digital synthesizer with circuit AD9951 by Analog Devices. The device will be controlled from a PC via USB. The device works with internal oscillator, with the ability to connect an external frequency standard of 10 MHz. On input is frequency doubler with transistor. Outpu signal is filtered by low-pass filter and amplified by monolitic amplifier ERA-3+.
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Signal generator for analog measurement approach
Gottwald, Petr ; Bohrn, Marek (referee) ; Fujcik, Lukáš (advisor)
The purpose of this bachelor thesis is the design of Xilinx XC3S200A FPGA-based, digital function generator for generating of sine waves, triangular waves and rectangular waves for evaluation of analog circuit characteristics. In the theoretical section of the thesis, basics of spectral analysis, digital-to-analog conversion and three most often used methods for digital signal synthesis (DDS, PWM, sigma-delta) are discussed. In the practical section of the thesis, DDS generator blocks are designed and described in VHDL language. The generator is intended to be fully controllable from PC computer via USB interface. PC control application was also designed. Analog circuits needed for output signal conditioning were designed and simulated. Simulation results are compared with measurement results in the final section of this thesis.
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