Development Of Signal Generator For Real-time Dynamic Signal Analyzer System

The signal analysis is a newly arisen technique, which has already extensively applied in the correspondence, radar, earthquake, biomedical science and machine etc. With the development of the computer and digital technology, there is a modern signal analysis method which is based on mathematic analysis. Then, a signal analyzer emerged which include data generating, data acquisition, A/D converter, digital signal processing etc. It is an ideal tool used for analyzing noise, electronic circuits, vibration signals etc. It is widely applied in many industrial fields, such as automobile, electron, spaceflight and navigation, environment protecting etc. It needs one certain precision signal generator device that provides the standard for the system in many data acquisitions and the measurement systems. In many data acquisition and measurement system with the accuracy of the signal generator's own needs. To provide standard test signals .The common signal generator using traditional simulation oscillation methods and simple DAC converter methods has obviously not meet the requirements, Therefore, there need for a high-fidelity, high signal-to-noise ratio, high-precision signal generator functions. The main study of this thesis is design and realization of the signal generator based on DSP technology andΣ-ΔDAC chip. It mainly used today's advanced DSP technology, the digital-analog conversion technology and the software algorithms in the process .The process of achieving the major applications of today's advanced DSP technology, the digital-analog conversion technology and the software algorithms.The hardware part of the system is composed of DSP module , DAC module, CPLD interfaces ,the output processing circuit. The generator utilized 24-BitΣ-ΔDAC PCM1742, and generated the data of waveform real-time via floating-point DSP TMS320VC33. The analog signal generated by DAC then was sent to analog filter and output circuit. The signal generator can provide a lot of waveform under 96kHz, such as sine, square, triangle, sawtooth, swept and white noise, pseudo random, etc.In order to apply the software part of the system better, the design willbe applied in the integrated development environment CCS to program the DSP chip. The CCS environment, uses Windows style interface including editing, translation, links, software simulation, and hardware debugging real-time tracking functions into one, greatly facilitate the development of the DSP design and develop process. In the development of the software, coding process has a detailed code of the simulation tests then the whole system of hardware and software system has been testing. Test results show that the system is stable, 2 output channels , 24 resolution. The maximum frequency is 96kHz.Finally,the paper describes the main work and results. It also indicates some flaws in this design, which remains to be improved and more perfect for further developers.