Investigation of Phase-Shifting and Frequency Conversion Sinusoidal Signal Generator Based on DDS and FPGA

2014 ◽  
Vol 556-562 ◽  
pp. 1580-1583
Author(s):  
Xu Han ◽  
Peng Wang ◽  
Shan Shan Li ◽  
Xue Zhao
Keyword(s):  
High Frequency ◽  
Frequency Conversion ◽  
Phase Shifting ◽  
Frequency Resolution ◽  
Frequency Synthesis ◽  
Output Frequency ◽  
Direct Digital Frequency Synthesis ◽  
Digital Frequency ◽  
Field Programmable ◽  
Low Phase Noise

The direct digital frequency synthesis (DDS) technology has high frequency resolution, fast frequency switching, low phase noise and higher frequency stability, so it is widely used in communications, aerospace, instrumentation and other fields. In this paper, the DDS system was designed based on Field Programmable Gate Array (FPGA) and hardware design language (VHDL). The experimental and simulation results show that the system has stable output frequency, high frequency accuracy, adjustable frequency and phase.

Frequency Conversion Type Ultrasonic Power Based on DSP Control Technology Research

2013 ◽  
Vol 442 ◽  
pp. 349-353 ◽  
Author(s):  
Chang You Li ◽  
Ming Ming Jia ◽  
Wen Hua Wang
Keyword(s):  
Embedded System ◽  
Power Supply ◽  
Frequency Conversion ◽  
Ultrasonic Power ◽  
Frequency Synthesis ◽  
Direct Digital Frequency Synthesis ◽  
Frequency Tracking ◽  
Digital Frequency ◽  
Frequency Changes ◽  
Dsp Control

The introduction of the direct digital frequency synthesis (DDS) technology in the field of communication is against the traditional ultrasonic machining power supply which does not have the multi-frequency tracking shortcomings to build a frequency conversion type ultrasonic power. Frequency conversion type ultrasonic power supply is based on DSP embedded system and adopts direct digital frequency synthesis (DDS) technology combined with a software phase locked frequency of composite frequency tracking scheme to realize automatic search transducer resonance frequency and frequency automatic tracking function which can response the different characteristics of the transducer dynamical; With the use of phase shift control power-principle to realize the output power regulating function when the frequency changes and reduce the switching power loss; It provides an important reference for the design of new frequency conversion type ultrasonic power.

Analysis of Phase Truncation Error Based on Multi-Path Pseudo-Interleaved Direct Digital Frequency Synthesis

2015 ◽  
Vol 24 (10) ◽  
pp. 1550146 ◽  
Author(s):  
Ke Liu ◽  
Guangkun Guo ◽  
Yindong Xiao ◽  
Shulin Tian
Keyword(s):  
Truncation Error ◽  
Sampling Rate ◽  
Clock Generator ◽  
Frequency Synthesis ◽  
Output Frequency ◽  
Direct Digital Frequency Synthesis ◽  
Complex Phase ◽  
Digital Frequency ◽  
Single Path ◽  
Phase Truncation

Low output frequency and spurs are main imperfections in direct digital frequency synthesis (DDFS). For increasing output frequency determined by sampling rate, the structure of multi-path pseudo-interleaved DDFS is proposed. However, it introduces more complex phase truncation error than single path DDFS. In order to analyze the effect of phase truncation error, the model of pseudo-interleaved DDFS with phase truncation is established. Based on the model, the distribution and amplitude of spur caused by phase truncation are discussed and calculated. Then some important conclusions are drawn and proved by experiment, which can provide theoretical supports for spurious performance evaluation and parameter selection while designing signal source or clock generator based on pseudo-interleaved DDFS.

scholarly journals Impedance Cytometry for Detection of Particle and Counting using Low Phase Noise DDFS – LUT

2020 ◽  
Vol 9 (8) ◽  
pp. 847-850
Keyword(s):  
Power Consumption ◽  
High Frequency ◽  
Software Defined Radio ◽  
Frequency Resolution ◽  
Noise Power ◽  
Direct Digital Frequency Synthesis ◽  
Digital To Analog Converter ◽  
Digital Frequency ◽  
Impedance Cytometry ◽  
Direct Digital Frequency Synthesizers

The biotechnology is widely growing with many technologies, still we see a large gap in real-time implementation of complete blood counting. To increase the resolution and accuracy of the measurements advanced communication DDFS can be used. The elements in Direct Digital Frequency Synthesizers (DDFS) involved are: phase accumulator, a phase to amplitude converter which also called look up table (LUT), a digital to analog converter along with active filter. Direct digital frequency synthesis is a method for generating complex high - frequency waveforms for specific applications. This DDFS generates frequency resolution which makes it ideal components use in radar system, software defined radio, modern wireless communicating system, advanced satellite navigation purpose. Use cases for high frequency we get interrupt with spurious noise, larger ROM size, and high power consumption of DDFS signal. In this paper we are proposing the use of signal generated from DDFS to impedance cytometry in which the number of particles gets detected by getting the output frequency different from the input frequency. Due to use of small frequency range of signal spurious noise, power consumption and ROM size will be less with effective performance

Biomaterial Impedance Analyzer Based on Digital Auto Balancing Bridge

2011 ◽  
Vol 291-294 ◽  
pp. 1259-1262
Author(s):  
Nan Li ◽  
Yi Nan Wang ◽  
Hong Shan Nie ◽  
Hong Qi Yu ◽  
Hui Xu
Keyword(s):  
Bridge Circuit ◽  
Design Method ◽  
Circuit Simulation ◽  
Low Frequency ◽  
Operational Amplifiers ◽  
Frequency Synthesis ◽  
Direct Digital Frequency Synthesis ◽  
Impedance Analyzer ◽  
Digital Frequency ◽  
Phase Sensitive

This paper presents the design method of a novel biomaterial impedance analyzer based on digital auto balancing bridge method. The system hardware mainly consists of FPGA, ADC, DACs and operational amplifiers. Many DSP algorithms such as direct digital frequency synthesis (DDS), digital phase sensitive demodulation (DPSD), digital modulation and digital filter are implemented in FPGA to realize the auto balancing function of the bridge circuit. Simulation results show that the system has good performance from low frequency to 10MHz. It is suitable for EIS application in biomaterial analysis.

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