【導(dǎo)讀】1方波震蕩電路---------------------------------------------7. 7有效值檢波電路-------------------------------------------13. （二）軟件設(shè)計(jì)----------------------------------------------------26. 附錄一：信號采集顯示程序---------------------------------------33. 附錄二：英文原文-----------------------------------------------36. 附錄三：英文翻譯-----------------------------------------------42. 在部隊(duì)技術(shù)保障中，都有著廣泛的使用。信號波形合成作為一種通用電子測試儀。器的組成是軍隊(duì)進(jìn)行科技戰(zhàn)爭不可缺少的一種測試儀器。因此，從理論到工程對。度出發(fā)都有著積極的意義。隨著科學(xué)技術(shù)的發(fā)展和測量技術(shù)的進(jìn)步，對信號發(fā)生。頻率可方便調(diào)節(jié)的信號源。尤其是隨著通信事業(yè)的發(fā)展，頻道的分布日趨密集，要求有高精度、高穩(wěn)定度的通信頻率。用常規(guī)的信號發(fā)生器無法滿足要求。

　　

【正文】 。 P0=LEDcode1[disbuf[0]]。 P2=dispbitcode[0]。 delay2ms()。 for(dispcount=1。dispcount4。dispcount++) { P2=0xff。 P0=LEDcode[disbuf[dispcount]]。 P2=dispbitcode[dispcount]。 delay2ms()。 P2=0xff。 } } void main() { 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計(jì)（正文） 第 34頁 共 46頁 START=0。 P2=0xff。 OE=1。 while(1) { // P0=channel。 START=0。 START=1。 START=0。 P1=0xff。 EOC=1。 while(EOC==0)。 OE=0。 uiResult=P1。 OE=1。 //uiResult=(uiResult*100)/51。 aa=uiResult。 aa=((aa*5)/255)。 bb=aa*1000。 if(bb1500) { bb=bb*。 uiResult=bb。 } else { bb=bb*。 uiResult=bb。 } 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計(jì)（正文） 第 35頁 共 46頁 disbuf[0]=uiResult/1000。 //disbuf[0]=1。 disbuf[1]=(uiResult/100)%10。 //disbuf[1]=2。 disbuf[2]=(uiResult/10)%10。 //disbuf[2]=3。 disbuf[3]=uiResult%10。 //disbuf[3]=4。 Display()。 } } 附錄二：英文原文 The Analysis and Design of Waveform Generator Xue lian ,Wang Fan ,Zheng Jinfa Engineering and Commerce College, SouthCentral University for Nationalities, Wuhan Hubei 430065 Abstract: In this paper, the sinusoidal waves in different frequency were synthesized into square wave according to the method of Fourier series. Firstly, the needed sinusoidal waves were achieved through the square wave generation circuit, the frequency division circuit and the filter circuit。 then, after the sinusoidal waves’ phase position were shifted and synthesized, the square wave was generated. This circuit in this method was more cheaper than other circuits (eg: DDS). Keywords: Waveform Generator。Sinusoidal Wave。 Filter。Phase Position Shift 1 waveform synthesis system overview This is designed to simulate the process of signal synthesis. For a square wave signal by Fourier series spread knowable, it can depose the amplitude of the more specific for unlimited odd harmonics, so in turn as long as infinite multiple odd harmonic ponent, the amplitude and the harmonic proportion in a particular superposition, also will certainly get a square wave signal. This paper is the simulated the base wave and three harmonic harmonic ponent synthesis process of square wave signal. Theoretically speaking, the harmonic ponents, synthetic waveform will more close to the standard square bobo shape. This system begin with a square wave oscillator to generate a frequency of 60KHz pulse signal, again into separate frequency device 10KHz to get a frequency for handling of square wave signal and a frequency of square wave signal for 30KHz, then respectively through the filter processing for the sine signal and 30KHz 10KHz to closespaced 10KHz sine wave as base wave 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計(jì)（正文） 第 36頁 共 46頁 ponent, 30KHz sine wave as three times, through modulation circuit harmonics of adjust them respectively in fengfeng value, can satisfy 2V 6V and Fourier series spread coefficient ratio。 Put the sine signals into 10KHz to phase shifter phase adjuster, and after 30KHz sinusoidal signal together into addition circuit synthesis, namely plete signal stack. It can be inferred that the output signal is adder an approximate squarewave signal, and frequency for probably 10KHz. System unit circuit as shown in figure 1 below. Figure 1 system structure diagram 2 the hardware circuit design square wave generating circuit design According to the above analysis, the 60kHz should be produced for pulse frequency. Square wave can use digital circuit generation, also can use analog circuits produce. As digital circuits produce waveform amplitude, needs to be smaller using simulated circuit to amplify。 And pared with mixedsignal circuit pure analog circuits to plex, therefore, in this the paper only with analog circuits to generate square wave. The basic principle is: through the voltage parator produce high level。 Through the feedback loop and delay link to the electric frequency periodically height variations. Principle chart as figure2shows, diagram hysteretic parator output voltage, threshold voltage。 Oscillation period for. Through calculating formula by cycle that change, C, R1 ifss can be obtained with R2 ratio required pulse frequency. But this several variables in actual circuit will be some constraints, in choosing device parameters through actual adjustment should be determined. Select devices, it is suggested that resistance, so that circuit using metal film resistors the heat generated by the noise is small。 Choose opamp should consider when it39。s passband, passband more hours, it is difficult to achieve squarewave requirements, so we chose the frequency performance was good OPA820 opamp. Front generated for square can39。t use, this latter stage, still need to pass the followup processing, should first except negative voltage isolation, here with a diode, so after diode for the voltage after subtracting tube voltage half before diode pressure drop. Thus square wave amplitude will more small, in order to achieve the minimum separate frequency circuit requirements, should be the voltage waveforms were pressurization. In proportion with pressor circuit USES amplifier, get the voltage amplitude moderate. Then after the voltage level for use, but in order to reduce load after each level circuit, the influence of wavelet produce circuit with load ability raise circuit, finally take a shot extremely follow device. To this, square wave generator can be expected to reach, could plug in the latter stage circuit. 方波發(fā)生電路 分頻 電路 濾波 電路 10Khz調(diào)幅 30KHz 調(diào)幅 移相 電路 加法 電路 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計(jì)（正文） 第 37頁 共 46頁 U1O P A 8 4 2 I D32 476R11kΩR21kΩR31kΩ R410kΩK e y = A50%R5220ΩC21 0 n FD1 1 N 4 7 2 8 AD2 1 N 4 7 2 8 AD31 N 4 0 0 74053216 Uo Figure 2 square wave gen