Text and notes a Though the ideal model may seem a bit remote from reality--with infinite gain, bandwidth, etc, it should be realized that the closed loop gain relations which will be derived in this section are directly applicable to real circuits-to within a few tenths of a percent in most cases 尽管理想模型与实电路相差甚远,比如,理想运放具有 无带和无大的增益,但需要明白的是,本节利用理 想运放推导出的场环增益公式可直接应用于实所电路,多 数情况下两者相差仅为于分之几 上海海事大学息工程学院
上海海事大学信息工程学院 Text and notes ◼ Though the ideal model may seem a bit remote from reality--with infinite gain, bandwidth, etc., it should be realized that the closed loop gain relations which will be derived in this section are directly applicable to real circuits-to within a few tenths of a percent in most cases. ◼ 尽管理想模型与实际电路相差甚远,比如,理想运放具有 无限带宽和无穷大的增益,但需要明白的是,本节利用理 想运放推导出的闭环增益公式可直接应用于实际电路,多 数情况下两者相差仅为千分之几
Text and notes a If a small voltage, measured at the inverting input with respect to the non-inverting input, is assumed to exist, the amplifier output voltage will be of opposite polarity and can always increase in value(with infinite output available) until the voltage between the inputs becomes infinitesimally small 假如在反相输入端测得与同相输入端之间存在一小电压 则放大器的制出电压与该物入电压极性相反且真数值 直增加(可以是无穷大),直至输入电压变为无穷少为止。 上海海事大学息工程学院
上海海事大学信息工程学院 Text and notes ◼ If a small voltage, measured at the inverting input with respect to the non-inverting input, is assumed to exist, the amplifier output voltage will be of opposite polarity and can always increase in value (with infinite output available) until the voltage between the inputs becomes infinitesimally small. ◼ 假如在反相输入端测得与同相输入端之间存在一小电压, 则放大器的输出电压与该输入电压极性相反且其数值会一 直增加(可以是无穷大),直至输入电压变为无穷小为止
Text and notes a In control and instrumentation applications, its practical value lies in the ease with which desired input impedance and gain values can be tailored to fit the requirements of the associated circuit 在控制与化器化表应用中,反相放大器的实际价值在于 利用它可以很容易地整所需地输入电阻和增益值以运应 关电路地要求。 上海海事大学息工程学院
上海海事大学信息工程学院 Text and notes ◼ In control and instrumentation applications ,its practical value lies in the ease with which desired input impedance and gain values can be tailored to fit the requirements of the associated circuitry. ◼ 在控制与仪器仪表应用中,反相放大器的实际价值在于, 利用它可以很容易地调整所需地输入电阻和增益值以适应 相关电路地要求
Grammar一数量的表示 ■科技文献中经常有大量数词出现。数词表 示事物的数量或数目,其含义十分严格, 理解或翻译时的疏忽和差错可能会引起严 重的后果 上海海事大学息工程学院
上海海事大学信息工程学院 Grammar-数量的表示 ◼ 科技文献中经常有大量数词出现。数词表 示事物的数量或数目,其含义十分严格, 理解或翻译时的疏忽和差错可能会引起严 重的后果
1、数字的表示 ■数字的表示规则: 用单词表示不定数量或者近似值 句首不用阿拉伯数字,一般用英语的单词,句末要尽量避 免用阿拉伯数字; ■两数连用时,分别用单词和阿拉伯数字表示,习惯上将短 的用单词写出; 遇到分数,可用带连字符号的单词表示 Eg: Phase shift is180° Eg: The gain of the voltage follower with the feedback loop closed is unity 上海海事大学息工程学院
上海海事大学信息工程学院 1、数字的表示 ◼ 数字的表示规则: ◼ 用单词表示不定数量或者近似值; ◼ 句首不用阿拉伯数字,一般用英语的单词,句末要尽量避 免用阿拉伯数字; ◼ 两数连用时,分别用单词和阿拉伯数字表示,习惯上将短 的用单词写出; ◼ 遇到分数,可用带连字符号的单词表示 ◼ Eg:Phase shift is 180° ◼ Eg:The gain of the voltage follower with the feedback loop closed is unity