外文翻譯---波形合成電路的分析與設(shè)計(jì)(已修改)
2025-01-30 14:37 本頁面
【正文】 附錄二：英文原文The Analysis and Design of Waveform GeneratorXue lian ,Wang Fan ,Zheng JinfaEngineering and Commerce College, SouthCentral University for Nationalities, Wuhan Hubei 430065Abstract: 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 Shift1 waveform synthesis system overviewThis 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 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.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Figure 1 system structure diagram2 the hardware circuit design square wave generating circuit designAccording 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 ach
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