【導(dǎo)讀】統(tǒng)和教學(xué)實驗等領(lǐng)域。目前使用的信號發(fā)生器大部分是函數(shù)信號發(fā)生器，且。特殊波形發(fā)生器的價格昂貴。波，波形的頻率可用程序控制改變。在單片機(jī)上加外圍器件距陣式鍵盤，通。過鍵盤控制波形頻率的增減以及波形的選擇，并用了LCD顯示頻率大小。單片機(jī)的輸出端口接DAC0832進(jìn)行D/A轉(zhuǎn)換，再通過運(yùn)放進(jìn)行波形調(diào)整，本設(shè)計具有線路簡單、結(jié)構(gòu)緊湊、價格低。廉、性能優(yōu)越等優(yōu)點(diǎn)。

　　

【正文】 of early diagnosis in the field of mechanical equipment signal feature extraction and fault diagnosis. In order to perform an onchip test for characterizing both static and transmission parameters of embedded analogtodigital converters (ADCs), this paper presents an oscillatorbased reconfigurable sinusoidal signal generator which can produce both high and low frequency sinusoidal signals by switching the oscillator into different modes. Analog and digital signals can additionally be produced concurrently in both modes to provide not only test stimuli, but also reference responses for the ADC builtin selftest. The generated oscillation signal amplitude and frequency can be easily and precisely controlled by simply setting the oscillator clock frequency and initial condition coefficients. Except for a 1bit 哈爾濱工業(yè)大學(xué)華德應(yīng)用技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 26 digitaltoanalog converter and smoothing filter, this proposed generator is constructed entirely by digital circuits, and hence easily integrates this silicon function and verifies itself before testing the ADCs. Arbitrary signal generators play an important role in many applications. Several different techniques utilizing both analog and digital approaches are being used for the generation of periodic signals. However, all of them suffer from many drawbacks. In this study, we present modeling, simulation and prototyping of a novel periodic arbitrary signal generation system using FPGAs. The proposed system utilizes orthogonal functions to generate a variety of periodic arbitrary signals. Approach:A new approach for designing arbitrary signals utilizing Walsh and Rademacher functions had been used. The design had been done using stateoftheart high level design techniques and has been targeted to the latest available FPGA chips from Xilinx and Altera. Results:The simulation results demonstrated both the digital and analog versions were presented. It was found that all the signals generated showed precisely zero error and the signal generated was exactly the same as the desired one. Conclusion:Excellent accuracy with zero error is achieved. The designed and implemented Arbitrary signal Generation System is standalone and doesn’t require the support of any puter hardware or software, as was needed in earlier attempts It has been concluded that virtually any periodic signal can be generated using the technique developed. There are many different types of signal generators, with different purposes and applications (and at varying levels of expense). In general, no device is suitable for all possible applications. Hence the selection of signal generator is as per requirements. For SST1 Data Acquisition System requirements, we have developed a CAMAC based Test Signal Generator module using Reconfigurable device (CPLD). This module is based on CAMAC interface but can be used for testing both CAMAC and PXI Data Acquisition Systems in SST1 tokamak. It can also be used for other similar applications. Unlike traditional signal generators, which are embedded hardware, it is a flexible hardware unit, programmable through Graphical User Interface (GUI) developed in LabVIEW application development tool. The main aim of this work is to develop a signal generator for testing our data acquisition interface for a large number of channels simultaneously. The module front panel has various connectors like LEMO and D 哈爾濱工業(yè)大學(xué)華德應(yīng)用技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 27 type connectors for signal interface. The module can be operated either in continuous signal generation mode or in triggered mode depending upon application. This can be done either by front panel switch or through CAMAC software mands (for remote operation). Similarly module reset and trigger generation operation can be performed either through front panel push button switch or through software CAMAC mands. The module has the facility to accept external TTL level trigger and clock through LEMO connectors. The module can also generate trigger and the clock signal, which can be delivered to other devices through LEMO connectors. The module generates two types of signals: Analog and digital (TTL level). The analog output (single channel) is generated from Digital to Analog Converter through CPLD for various types of waveforms like Sine, Square, Triangular and other wave shape that can vary in amplitude as well as in frequency. The module is quite useful to test up to 32 channels simultaneously with different frequency TTL level square wave signal (digital signal) in a group of 8 channels. There are four such groups with similar set of frequencies. The different frequencies in group help us to test phase shifts between different channels. We have tested 32 channels of PXI Data acquisition modules simultaneously with the developed hardware. 哈爾濱工業(yè)大學(xué)華德應(yīng)用技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 28 附錄 3 原理圖 哈爾濱工業(yè)大學(xué)華德應(yīng)用技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 29 P1.01P1.12P1.23P1.34P1.45P1.56P1.67P1.78RST9RXD/P10TXD/P11INT0/P3.212INT1/P3.313T0/P3.414T1/P3.515WR/P3.616RD/P3.717XTAL118XTAL219GND20P2.021P2.122P2.223P2.324P2.425P2.526P2.627P2.728psen29ALE30EA/VPP31P0.732P0.633P0.534P0.435P0.336P0.237P0.138P0.039VCC40J1AT89S52R315KY1 12MC4 33P C5 33PRSTR2 1K R1 10KC3 ELECTRO1S1SWPBVCCVCC1 2 4 56U3 74LS21CS1WR12GND3DI34DI25DI16DI07VRE