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放大电路频率响应的类比教学方法

2017-08-22朱嘉林

科技资讯 2017年20期

朱嘉林

摘 要:放大电路频率响应教学内容是模拟电子技术课程的重要内容,大部份学生在理解这一部分内容时都存在着困难。该文针对放大电路频率响应的教学方法进行探讨;提出了先计算分析电容电阻构成的分压电路的频率响应,然后过渡到放大电路频率响应计算分析的类比教学方法,从而使学生深入了解放大电路中产生频率响应的原因,同时通过简单计算放大电路中耦合电容、旁路电容,以及晶体管等效电容所在回路的时间常数,通过类比得到放大电路的频率响应,降低放大电路频率响应计算分析的复杂程度,使教学事半功倍。

关键词:类比方法 频率响应 放大电路 电压放大倍数

中图分类号:G613 文献标识码:A 文章编号:1672-3791(2017)07(b)-0188-05

Abstract: Amplifier circuit frequency response teaching content is an important part of analog electronic technology courses, there are difficulty formost students in the understanding of this part of the content In this paper, the teaching method of the frequency response of the amplifier circuit is discussed in this paper. At First, The frequency response of the voltage divider circuit composed of the capacitor resistance is analyzed and calculated , and then the analogical teaching method of the frequency response calculation of the amplifier circuit is transitioned, so that the students can understand the amplification circuit, and the frequency response of the amplifier circuit is obtained by simply calculating the time constant of the coupling capacitor, the bypass capacitor and the circuit of the equivalent capacitance of the transistor. The frequency response of the amplifier circuit is obtained by analogy, and the complexity of the frequency response calculation and analysis of the amplifier circuit is reduced.It was achieved with minimum fuss and maximum efficiency.

Key Words: Analogue method; Frequency response; Amplification circuit; Voltage amplification factor

由于放大電路存在电抗性元件(如耦合电容、旁路电容),以及放大器本身具有极间电容,它们的阻抗都是信号频率的函数,因此,当输入信号中含有不同频率正弦分量时,电路的放大倍数就成为频率的函数,这种函数关系称为放大电路的频率响应或频率特性。放大电路频率响应是模拟电子技术课程中有的重要教学内容,但多数老师都感到教学学习时间花了不少,但教学效果不能令学生满意。通过深入了解,学生无法掌握这一部份教学内容,其主要原因在于教材中关于放大电路频率响应的讲解比较简单公式化,大部份学生对这一部份内容的理解感到非常困难,无法认识电容在放大电路中所起到的作用。……

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