Design and Implementation of DDFS Based on CORDIC in FPGA

2014 ◽  
Vol 539 ◽  
pp. 65-69
Author(s):  
Xiao Ming Yang
Keyword(s):  
Main Part ◽  
Digital Signal ◽  
Sine Wave ◽  
High Accuracy ◽  
Cordic Algorithm ◽  
Pipeline Architecture ◽  
Design And Implementation ◽  
Wave Oscillator ◽  
Ad Converter ◽  
Hardware Resource

DDFS is widely used in digital signal processing and communications. Orthogonal sine wave oscillator is the main part of DDFS. In this paper, a new CORDIC algorithm implemented based on FPGA is proposed to realize DDFS. Replace the traditional look-up table ROM method to CORDIC algorithm. The algorithm has been realized in the FPGA using the pipeline architecture. The design has the advantages of little hardware resource consumption, high accuracy, and without memory. At the end, give a simulation waveform and spectrum analysis by AD converter, show the result in oscilloscope.

The Research and Design of Portable ECG Acquisition Device Based on Bluetooth and 3G

2013 ◽  
Vol 651 ◽  
pp. 538-542
Author(s):  
Dong Xin Lu ◽  
Tao Liu
Keyword(s):  
Digital Signal ◽  
Ecg Signal ◽  
Time Analysis ◽  
Design And Implementation ◽  
Structure Framework ◽  
Ad Converter ◽  
Function Modules ◽  
Acquisition Device ◽  
Research And Design ◽  
Ecg Data

This paper describes the hardware structure framework of portable ECG acquisition device based on Bluetooth and 3G, focusing on hardware selection and various function modules design and implementation. ECG acquisition by the terminal node of the analog signal will be collected through the AD converter to a digital signal, using the Bluetooth technology to transmit the digital signal to the monitoring center, then store the ECG data at the same time analysis the ECG signal for the real-time.

True RMS Detection of Non-Sine Wave for Power Grid

2011 ◽  
Vol 467-469 ◽  
pp. 1798-1802
Author(s):  
Xin Sheng Che ◽  
Xiao Xue Gu ◽  
Li Wang
Keyword(s):  
Digital Signal ◽  
Sine Wave ◽  
Sampling Frequency ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Testing Data ◽  
Ad Converter ◽  
Scale Error ◽  
Power Frequency ◽  
Harmonic Components

Simple multimeter can not measure True RMS of power frequency if there mixed harmonic components. In order to solve this problem, a method is adopted to design a measurement system by using STC Single Chip Microcomputer (SCM). It changes current into voltage by using I/V conversion circuit. Then analog signal turns into digital signal through AD converter. Finally, the Single Chip Microcomputer treats and calculates the data by the RMS algorithm. Sampling frequency of the system is set as 6400sps by Single Chip Microcomputer. This kind of designment uses software instead of hardware and reduces the costs. The realization of the system shows the validation and transportability of the algorithm. The testing data show that this system can measure True RMS of power frequency. The relative full scale error is smaller than 1.284%.

scholarly journals DESIGN AND IMPLEMENTATION OF OP-AMP-RC SINE WAVE OSCILLATOR

2015 ◽  
pp. 98-109
Author(s):  
Khalid Awaad Humood ◽  
◽  
Adham Hadi Saleh ◽  
Wurod Qasim Mohamed ◽  
◽  
...  
Keyword(s):  
Sine Wave ◽  
Op Amp ◽  
Design And Implementation ◽  
Wave Oscillator

The Design and Implementation of Ship Electric Field Measurement System Based on MSP430

2012 ◽  
Vol 622-623 ◽  
pp. 1378-1383
Author(s):  
Peng Han ◽  
Yang Li
Keyword(s):  
Electric Field ◽  
Measurement System ◽  
Field Measurement ◽  
High Accuracy ◽  
Low Power Consumption ◽  
Electric Field Measurement ◽  
Low Snr ◽  
Design And Implementation ◽  
Key Technologies ◽  
Software And Hardware

The ship electric field has become a new physical field which is widely concerned at home and abroad in recent years. For the research of ship electric field, one of the most effective methods is to measure it underwater. According to the analysis of ship electric field signal’s characteristics, the ship electric field measurement system based on MSP430F149 was designed and the key technologies of software and hardware were also presented in this paper. The results of experiment demonstrated that the system could effectively measure the ship electric field signal in a low SNR. Meanwhile, it has the advantages of low power consumption, high accuracy and credible.

scholarly journals Precizinių rastrų formavimo sistemos juostos poslinkio matavimo junginio skaičiuojamieji tyrimai / Analytical research of displacement measuring unit of the precise raster-forming systems

2017 ◽  
Vol 9 (6) ◽  
pp. 597-601
Author(s):  
Antanas FURSENKO
Keyword(s):  
Work Environment ◽  
Mechanical Model ◽  
Main Part ◽  
Analytical Modeling ◽  
High Accuracy ◽  
Dynamic Calibration ◽  
Deformation Model ◽  
Specific Work ◽  
Analytical Research ◽  
Measuring Unit

The precision raster-forming systems creation and development must be based on research in the specific work environment. In not ideal metrological conditions the precision raster-forming system allows to achieve high accuracy of the calibration, when used dynamic calibration method.The paper analyzes the possibility of analytical modeling of one main part (steel tape displacement measuring unit) of precise raster forming systems. In the work, a linear mechanical model of steel tape was applied to the load. The work described the equation, which describes the steel tape deformation model under loads with boundary conditions.

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