scholarly journals Design and Analysis of a Low Cost Wave Generator Based on Direct Digital Synthesis

2015 ◽  
Vol 2015 ◽  
pp. 1-17 ◽  
Author(s):  
Jian Qi ◽  
Qun Sun ◽  
Xiaoliang Wu ◽  
Chong Wang ◽  
Linlin Chen
Keyword(s):  
Low Cost ◽  
Signal Generator ◽  
Frequency Resolution ◽  
Direct Digital Synthesis ◽  
Basic Principles ◽  
Display Module ◽  
Output Amplitude ◽  
Digital Synthesis ◽  
System Module ◽  
Minimum System

Signal generators are widely used in experimental courses of universities. However, most of the commercial tests signal generators are expensive and bulky. In addition, a majority of them are in a fixed working mode with many little-used signals. In order to improve this situation, a small sized and highly accurate economic signal generator based on DDS technology has been developed, which is capable of providing wave signals commonly used in experiments. Firstly, it is introduced the basic principles of DDS and is determined the overall scheme of the signal generator. Then, it proposes a design of the hardware, which include power supply module, display module, keyboard module, waveform generating module based on DDS chip, and the minimum system module based on C8051F010. The signal generator was designed to output sine and square waveforms, and the other achieved performances included the frequency range 0.1 Hz–12.5 MHz, the frequency resolution 0.05 Hz–0.1 Hz, the output amplitude 1.0–4.5 V, the frequency accuracyKfmin=94.12% andKfmax=99.99%, and the signal distortionRTHDmin=0.638% andRTHDmax=11.67%.

scholarly journals Low distortion signal generator based on Direct Digital Synthesis for ADC Characterization

ACTA IMEKO ◽  
2012 ◽  
Vol 1 (1) ◽  
pp. 59 ◽  
Author(s):  
Walter Fabian Adad ◽  
Ricardo Javier Iuzzolino
Keyword(s):  
Signal Generator ◽  
Frequency Resolution ◽  
Frequency Range ◽  
Direct Digital Synthesis ◽  
Digital Synthesis ◽  
Low Distortion ◽  
The Stability

<p class="Abstract"><span lang="EN-US">This paper presents a low distortion signal generator with a frequency range from 0 to 10 kHz using the direct digital synthesis (DDS) method for ADC characterization. The results show that the maximum distortion in the whole frequency range is -80.37 dB, the frequency resolution is 1.421 nHz (with a 48-bits DDS chip), the stability in frequency is 25 µHz/Hz and the amplitude stability is 13 µV/V.</span></p>

The Design of Signal Generator Based on FPGA High Resolution

2015 ◽  
Vol 713-715 ◽  
pp. 970-974
Author(s):  
Chun Yan He ◽  
Bing Qi Liu ◽  
Ming Zhe Liu ◽  
Xiao Bo Mao
Keyword(s):  
Design Thinking ◽  
Design Method ◽  
Sine Wave ◽  
Test System ◽  
Signal Generator ◽  
Frequency Resolution ◽  
Frequency Synthesis ◽  
Direct Digital Synthesis ◽  
Switch Time ◽  
Digital Synthesis

In view of the digital geophone self-test system application demand for a variety of high quality waveform signal. This paper introduces a kind of design method of direct digital synthesis waveform signal generator based on FPGA. It mainly discusses the principle of the method of frequency synthesis technology, design thinking and implementation method. And using the design method of pipeline structure to improve circuit structure of 48 bits phase accumulator, so as to improve the running speed, and further increase the resolution of frequency synthesis. The test shows that the signal generator can produce sine wave, square wave, sawtooth wave, triangle wave. The frequency resolution can reach 0.18μHz. The highest output frequency is up to 20MHz, and frequency switch time is 20ns.

High-Precision Quadrature Signal Generator for Digital Demodulation of MEMS Gyroscope

2015 ◽  
Vol 645-646 ◽  
pp. 561-565
Author(s):  
Dan Hua Chen ◽  
Li Chen ◽  
Hui Zhou ◽  
Ying Tian
Keyword(s):  
Standard Deviation ◽  
High Stability ◽  
Signal Generator ◽  
Test Results ◽  
Direct Digital Synthesis ◽  
Mems Gyroscope ◽  
Quadrature Signal ◽  
Digital Synthesis ◽  
Fpga Chip ◽  
Digital Demodulation

A new quadrature signal generator based on Direct Digital Synthesis (DDS) algorithm for digital demodulation of MEMS gyroscope was proposed in this paper. To avoid quantization error, the dual-accumulator with signal-ROM structure was adopted. This signal generator was realized in FPGA chip, which could be quit compact to realize all digital demodulation in one chip. Simulations and tests of the generator were carried out. The test results demonstrate that the signal generator achieves high stability. The standard deviation of the frequency is 0.075Hz and the standard deviation of the amplitude is 0.037mV.

The Design of Positioning Terminal Based on NEO-5Q

2013 ◽  
Vol 427-429 ◽  
pp. 868-871
Author(s):  
Xing Hong Kuang ◽  
Zhi Yu Wang ◽  
Hai Bo Huo ◽  
Shi Ming Wang
Keyword(s):  
Liquid Crystal ◽  
Global Positioning System ◽  
Liquid Crystal Display ◽  
Power Module ◽  
Display Module ◽  
Global Positioning ◽  
System Module ◽  
Design Idea ◽  
Navigation Information ◽  
Minimum System

This paper introduces a design of liquid crystal GPS positioning terminal based on microcontroller, the system consists of a GPS module, 12864 liquid crystal display module, MCU minimum system module, power module. The paper mainly puts forward the scheme and software design idea, hardware design and debug, the extraction system can realize the positioning and navigation information parameters of GPS global positioning system and the information parameters is analyzed.

Design of Chirp Signal Based on NIOS

2014 ◽  
Vol 889-890 ◽  
pp. 881-885
Author(s):  
Ling Gang Zeng ◽  
Shou Liang Yang ◽  
Xing Xing Mu
Keyword(s):  
Design Process ◽  
Low Cost ◽  
Hardware Design ◽  
Signal Generator ◽  
Frequency Resolution ◽  
Design Solution ◽  
Chirp Signal ◽  
Frequency Bandwidth ◽  
Matlab Simulink ◽  
Dsp Builder

This paper analyzes the function of chirp. A design solution based on SOPC technology chirp signal put forward after the function had been studied both the hardware design and implement method. The chirp signal generator based on SOPC is designed according to the design process of Matlab/Simulink/DSP Builder/ QuartusII. The generator can produce the chirp signal well which is verified by the Matlab/Simulink and QuartusII. The starting frequency, bandwidth, and frequency resolution of chirp signal can be revamped by utilizing SOPC technology. This method is easier to implement since it is simple to design, easy to modify, low cost, no programming.

scholarly journals Direct digital synthesis generator

2020 ◽  
Author(s):  
Kornei Sergeevich Tertychnyi
Keyword(s):  
Signal Generator ◽  
Direct Digital Synthesis ◽  
Signal Synthesis ◽  
Digital Synthesis

This article illuminates one of the most promising methods for signal synthesis and also describes the basic elements used to create a signal generator and the possibility of manufacturing the device.

The SAPPHIRE auroral radar system

1995 ◽  
Vol 73 (3-4) ◽  
pp. 211-226 ◽  
Author(s):  
J. A. Koehler ◽  
G. J. Sofko ◽  
D. André ◽  
M. Maguire ◽  
R. Osterried ◽  
...  
Keyword(s):  
Data Collection ◽  
Continuous Wave ◽  
Auroral Zone ◽  
Radar System ◽  
Frequency Resolution ◽  
Direct Digital Synthesis ◽  
Collection System ◽  
Data Collection System ◽  
Custom Design ◽  
Digital Synthesis

This paper describes a new, 50 MHz auroral radar system, named SAPPHIRE, which observes at two locations in Canada: SAPPHIRE SOUTH, in the auroral zone and SAPPHIRE NORTH at nominal cusp latitudes in the vicinity of the polar cap – auroral zone boundary. SAPPHIRE was designed to offer superior time and frequency resolution for studies of the geophysical phenomena in the observing regions and to provide a better insight into the plasma processes responsible for the radio scattering. The radars are continuous-wave, dual bistatic systems with two transmitters and two receivers (both at a common receiver location) in each radar system. This configuration provides two-dimensional estimates of the phase velocities in the region of the scatterers. The systems were designed for unattended operation at remote sites and are controlled via modems using conventional telephone service. There are a number of innovative parts to the design of this radar. All frequencies used in the transmitter and receivers are generated using direct digital synthesis which gives independent and accurate control of both frequency and phase. The data collection system uses extensive parallel processing via a custom design of INMOS "transputers" in order to handle the large amount of data received per day. This data collection system only stores data for those times when the observed echoes fulfill some minimum threshold conditions. The most interesting aspects of the electronic design are described and some representative data from SAPPHIRE SOUTH are presented.

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