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差动放大电路是一种能压制温度漂移的直接耦合放大电路,其应用极其广泛,一直是《模拟电子技术基础》学习和教学的重点。对于其工作在双端输出模式下输出波形的测试,由于示波器输入探头的特点,不能从双端直接测量输出波形,而应采用分别测量它的两个单端输出波形再进行叠加的方法。作为差动放大电路学习的参考,这里简单介绍该测量方法,并在Multisim软件中进行仿真实现。
Differential amplification circuit is a kind of direct coupling amplifier circuit which can suppress temperature drift. Its application is extremely wide and has been the focus of study and teaching of “Foundations of Analog Electronic Technology”. For the work of output waveform test in double-ended output mode, because of the characteristics of the input probe of the oscilloscope, the output waveform can not be directly measured from both ends. Instead, two single-ended output waveforms should be measured and then superposed. As a reference for the learning of the differential amplifier circuit, this measurement method is briefly introduced and simulated in Multisim software.