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函數(shù)信號發(fā)生器---課設(shè)報告-文庫吧資料

2025-04-17 22:35本頁面
  

【正文】 則++++將上式整理,得比較器翻轉(zhuǎn)的下門限單位 Uia為 若 Uo1=Vee,則比較器翻轉(zhuǎn)的上門限電位 Uia+為 比較器的門限寬度 由以上公式可得比較器的電壓傳輸特性,如圖所示。運放的反相端接基準電壓,即 U=0,同相輸入端接輸入電壓 Uia,R1稱為平衡電阻。上述過程周而復(fù)始,電路產(chǎn)生了自激振蕩。隨后,Uo又通過 R3 對電容 C 反向充電,如圖中虛線箭頭所示。Uo 通過 R3 對電容 C 正向充電,如圖中實線箭頭所示。RC 回路既作為延遲環(huán)節(jié),又作為反饋網(wǎng)絡(luò),通過 RC 充、放電實現(xiàn)輸出狀態(tài)的自動轉(zhuǎn)換。三角波Upp=10V。波形變換的原理是利用差分放大器傳輸特性曲線的非線性。差分放大器具有工作點穩(wěn)定,輸入阻抗高,抗干擾能力較強等優(yōu)點。本課題采用先產(chǎn)生方波—三角波,再將三角波變換成正弦波的電路設(shè)計方法。 為進一步掌握電路的基本理論及實驗調(diào)試技術(shù), 本課題采用由集成運算放大器與晶體管差分放大器共同組成的方波—三角波—正弦波函數(shù)發(fā)生器的設(shè)計方法。2函數(shù)發(fā)生器總方案及原理框圖 函數(shù)發(fā)生器一般是指能自動產(chǎn)生正弦波、三角波、方波及鋸齒波、階梯波等 電壓波形的電路或儀器。精密穩(wěn)壓、穩(wěn)流電源還可作為檢定某些電工儀表用的穩(wěn)壓、穩(wěn)流電源。因此,通常都需要電壓穩(wěn)定的直流穩(wěn)壓電源供電。負載電流小,輸出電壓就高,負載電流大,輸出電壓就低。交流電經(jīng)過整流、濾波后變成直流電,雖然能夠作為直流電源使用,但是,由于電網(wǎng)電壓的波動,會使整流后輸出的直流電壓也隨著波動。s turn to be acplished by former Fang Bo that first order produces importing, the integrator produces a triangle then by opposition wave, the wave and the sine wave changing, owe a scheme characteristics such as have economy , convenient , pragmatic finally in similar third stage diode circuit realization triangle. Be posed of the Fang Bo triangle wave creation circuit from the parator and the integrator, Fang Bo that the parator exports gets a triangle after the integrator wave, e the triangle wave alternation circuit to the sine wave to be pleted mainly from differences the amplifier. Differences amplifiers have working spot stability , entering impedance height , the antiinterference ability waits for merit paratively by force. Can restrain the zero drift effectively when being directcurrent amplifier especially,the wave shifts Cheng Zheng string therefore with very low triangle of frequency wave. The principle that wave form shifts is to make use of differences amplifier transmission characteristic property curve nonlinearity.Key word: triangle mainly wave Fang Bo , sine wave 目 錄課程設(shè)計成績評定表……………………………………………………………I摘要………………………………………………………………………………IIAbstract…………………………………………………………………………III目錄………………………………………………………………………………IV1引言……………………………………………………………………………12總方案及原理框圖…………………………………………………………2 ……………………………………………………2 原理框圖………
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