專業(yè)英語ppt課件-資料下載頁
2025-05-05 18:37本頁面
【正文】 ifiers are now used for a wide variety of applications ， but the name operational amplifier or opamp is normally used even though no mathematical operations are involved. ?這種高增益放大器現(xiàn)在已被廣泛用于各個方面 ， 即使不再涉及數(shù)學(xué)運算 ， 但通常仍稱之為運算放大器或“ opamp”。 ?The gain of the 741 at zero frequency is quoted as being typically 2 105 in most manufacturer39。s datasheets ， with a minimum for any one device of 2 104 or 104 and no maximum value quoted. ?在大多數(shù)廠家的數(shù)據(jù)表格中 ， 741器件在零頻處的增益典型值是 2 105， 增益的最小值為2 104或 104， 無最大值引述 。 ?其中 “ with a minimum … and no maximum value quoted”為 with 的獨立主格結(jié)構(gòu) ， 起補充說明作用 。 ?It will be found that the gain of a 741 device falls off quite rapidly at frequencies above about 5Hz, this variation of gain with frequency is shown in for a typical 741 device. ?我們將會發(fā)現(xiàn) 741型器件的增益在頻率大約為 5赫茲時迅速下降 ， 典型的 741器件這種增益隨頻率的變化曲線如圖 19所示 。 ?fall off：下降 ， 跌落 ， 減少 ， 衰退 ， 離開 ?When a suitable amount of negative feedback is employed, the differences between integrated circuit operational amplifier of the same type number can be made negligible for all practical purposes. ?當(dāng)加了一定量的負(fù)反饋時 ， 在實際使用中同種型號集成運算放大器的區(qū)別可忽略 。 ?employed：此處意為 “ 使用 ” 。 ? The operational amplifier can be employed to generate square waves and can be made to perform a variety of mathematical operations by designing the feedback circuitry in such a way that the voltages at various parts of the circuit are proportional to the variables of interest. ?本句可譯為：運算放大器可以用來產(chǎn)生方波 ， 也可用使電路中各點的電壓與感興趣的變量成比例這樣的方式設(shè)計負(fù)反饋電路 ， 從而可用運算放大器來完成各種數(shù)學(xué)運算 。
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