电子信息技术专业英语教学课件ppt作者丁宁Unit4OperationalAmplifier课件.pptVIP

1 1 a variety of 各种各样的 even though 即使 be interested in 对...感兴趣 be known as 被称为… with respect to 关于, 至于 be equal to 等于，与…相等 Learn the text: Dialogue : Amplifier Design Supervisor: I would like you to do a preliminary calculation for an amplifier. Engineer: What are the details? How is the amplifier to be used? Supervisor: It must give a voltage gain of about 1000. Engineer: That isn’t enough information. I need to know the desired input impedance as well as the types of loads to be used with the amplifier. Supervisor: It must have a high input impedance with an input capacitance of no more than 50 micromicrofarads. The loads will be resistive in the frequency to be used. A few kilo-ohms will, I believe, be enough. Engineer: What will be the frequency? Supervisor: About one megacycle with a 200-kilocycle bandwidth. Engineer: How large will the input signals be? Supervisor: About half a volt, I believe. But smaller signals may be possible. Engineer: Any weight or size restrictions? Can we use transistors, or would you prefer ICs Supervisor: For the time being, there are no restrictions. Engineer: Is there any particular time when I must finish it? Supervisor: I’d like to test the first model in about a week. Engineer: Ok, I will begin the work right now. Unit 4 Operational Amplifier 运算放大器 Part One Electronics Preparing for the text: Technical terms: 1. operational amplifier 运算放大器 2. inverting input 反向输入端 3. non-inverting input 同向输入端 4. 8 pin dual-in line 8管脚双列直插式 Questions for text discussion: Why is operational amplifier given the name? Because it was originally applied to high gain amplifiers which can perform certain mathematical operations. 2. Draw the circuit symbol of an operational amplifier. 3. Talk about the applications of the operational amplifiers. It has a wide range of applications in such fie