基于Proteus的高性能共源放大电路的设计
2017-05-09朱嵘涛罗明璋徐爱钧
朱嵘涛+罗明璋+徐爱钧



摘 要: 在共射放大电路的实验中存在两个问题:输入电阻过大会影响静态工作点,进而会导致输出波形失真;输出电阻过小就会导致放大倍数的降低。针对这两个问题,提出一种高性能的共源放大电路,在输入电阻较大的同时又能满足输出电阻较小。在结合理论分析的基础上,借助Proteus虚拟实验设计环境分析了共射放大和共源放大电路的动态特性,即放大倍数、输入电阻和输出电阻。测试结果表明,共源放大电路在整体性能上要远优于共射放大电路,是一种高性能的共源放大电路。
关键词: 共射放大电路; 共源放大电路; Proteus; 动态特性分析
中图分类号: TN710.4?34 文献标识码: A 文章编号: 1004?373X(2017)08?0134?03
Design of high?performance common?source amplifying circuit based on Proteus
ZHU Rongtao1, LUO Mingzhang2, XU Aijun2
(1. Yangtze University College of Technology & Engineering, Jingzhou 434020, China; 2. Yangtze University, Jingzhou 434023, China)
Abstract: The experiment of the common?emitter amplifying circuit (CEAC) has two problems: the overlarge input resistance may affect on the quiescent operating point and causes the distortion of the output waveform, the small output resistance may decrease the voltage gain. In order to solve the two problems, a high?performance common?source amplifying circuit (CSAC) is proposed, which has the larger input resistance and smaller output resistance. On the basis of the theory analysis, the dynamic characteristics of the CEAC and CSAC are analyzed by means of the Proteus virtual experiment design environment, including the voltage gain, input resistance and output resistance. The test results show that the whole performance of CSAC is much better than that of CEAC, and the CSAC has high performance.
Keywords: common?emitter amplifying circuit; common?source amplifying circuit; Proteus; dynamic characteristic analysis
在传统的模拟实验教学中,放大电路实验更是重中之重,而衡量放大电路性能的主要指标有三个:放大倍数、输入电阻和输出电阻。对于放大电路来说,通常希望该放大电路的放大倍数越大越好、输入电阻越大越好、输出电阻越小越好。在放大电路的实验中通常以共射放大电路为主进行分析和讲解,然而共射放大电路存在两个问题: 输入电阻过大会影响静态工作点,进而会导致输出波形失真;输出电阻过小就会导致放大倍数的降低。针对这两个问题,本文提出了一个高性能的共源放大电路,较好地解决了这两个问题。
1 Proteus仿真平台
Proteus软件是英国LabCenter Electronics公司出版的EDA工具软件。它不仅具有其他EDA工具软件的仿真功能,还能仿真单片机及外围器件。……
