Design and Implementation of Signal Generator Based on DDS

2013 ◽  
Vol 380-384 ◽  
pp. 3643-3647
Author(s):  
Hong He ◽  
Jin Zhou Zhang ◽  
Zhi Hong Zhang
Keyword(s):  
Duty Cycle ◽  
Pulse Width ◽  
Signal Generator ◽  
Direct Digital Synthesis ◽  
Verilog Hdl ◽  
Design And Implementation ◽  
Quartus Ii ◽  
Digital Synthesis ◽  
Frequency Phase

A signal generator with adjustable frequency, phase and duty cycle is designed in this paper. The design of this signal generator is based on the technology of direct digital synthesis (DDS).The classic structure of DDS is presented and its principles are introduced in detail. The key modules of the design such as phase accumulator and pulse width processing are implemented by verilog HDL language. With suitable FPGA, the designed signal generator and all modules of the design are simulated successfully in Quartus II.

Design and Implementation of Floyd-Steinberg Algorithm Based on FPGA

2015 ◽  
Vol 738-739 ◽  
pp. 350-353
Author(s):  
Jun Yang ◽  
Zong Jing Li ◽  
Wen Long Li
Keyword(s):  
Real Time ◽  
High Speed ◽  
Complex Multiplication ◽  
Error Diffusion ◽  
Computation Complexity ◽  
Time Error ◽  
Verilog Hdl ◽  
Memory Space ◽  
Design And Implementation ◽  
Quartus Ii

In this paper, we put forward an innovation method of high-speed and real-time error diffusion, which is based on Floyd-Steinberg algorithm. The design introduces LUT(look up table) and pipeline technology instead of complex multiplication operations, which accesses to the memory frequently. The whole design uses Verilog HDL language to program and Quartus ii 8.0 to synthesize and layout. At the end of the paper, we use a 48 pixel as an example, then simulate and verify it on the Modesim, which can prove the correctness of the design. Compared with the standard Floyed-Steinberg algorithm, this design can reduce the computation complexity, use a smaller memory space to exchange lots of logic units and increase the throughput of the algorithm. Besides, it has the advantages of good reconfigurability, simple hardware structure and high real-time.

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.

scholarly journals Radiofrequency generator and programmer of pulse sequences for PMR relaxometer

2020 ◽  
Vol 22 (3) ◽  
pp. 90-96
Author(s):  
Tran Van Tung ◽  
R. S. Kashaev
Keyword(s):  
Proton Magnetic Resonance ◽  
Switching Time ◽  
Frequency Tuning ◽  
Computer Modelling ◽  
Pulse Sequences ◽  
Direct Digital Synthesis ◽  
Rf Pulses ◽  
Quartus Ii ◽  
Digital Synthesis ◽  
Rf Signal

Described the generator of resonance radiofrequency with the step of change 50 kHz in the range 520 MHz and pulse programmer of the pulse sequences for relaxometer of proton magnetic resonance (PMR). Using algorithm of direct digital synthesis (DSP), the RF generator has the ability to produce RF signal with a short switching time and high resolution in frequency and phase. To facilitate the generation of RF pulses, used the pulse programmer implemented in the FPGA directed by the auxiliary controller DSP to generate RF pulses with required sequences and parameters. Realized the testing of the generato r by method of computer modelling in the program Quartus II 12.1 and was shown the opportunities of synthesis of RF-pulses sequences with the phases 0, π/2, π, 3π/2 with resonance frequency tuning.

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.

Design of Dual High Precision Power Signal Generator Based on AD9854

2014 ◽  
Vol 568-570 ◽  
pp. 344-348
Author(s):  
Ru Sen Fan ◽  
Yong Wang ◽  
Jun Jie Yang ◽  
Zhi Wang
Keyword(s):  
High Precision ◽  
High Power ◽  
Duty Cycle ◽  
Signal Generator ◽  
Numerical Control ◽  
Signal Frequency ◽  
Direct Digital Synthesis ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Square Wave

To obtain the dual high-precision numerical control signal source, and could be accurately adjusted the dual signals frequency and phase and increase the output signal power, the paper presented a method based on direct digital synthesis technology and parallel push-pull output, designed and implemented the dual channel high-precision and high power signal generator. MSP430 controlled AD9854 registers to realize frequency and phase modulation, after low-pass filter to adjust the square wave duty cycle by the DAC7612, amplitude was integrated optimization adjustment by AD9854 AD603 and power amplifier. Consideration the anti-jamming measures, the system is stable and reliable, and can output high-precision and high power sine and square wave in the 5-150kHz frequency band, signal frequency, phase, amplitude and duty cycle can numerical control. In addition, it has sweep output mode.

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%.

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