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一个复杂的系统是少不了反馈的,一个稳定的系统更离不开反馈,反馈是稳定系统改善系统的一个重要手段,电子线路尤其如此。反馈是电子线路中较以难于弄懂的概念,其困难之处在于,如何判断反馈的极性问题,即是正反馈还是负反馈;如何确定反馈信号的源,即反馈信号是来自于输出电压,还是来自于输出电流;反馈信号如何控制输入信号,即是输入端串联,还是并联。这三个问题中特别是第一个问题更为重要,它决定了
A complex system is ultimately feedback, a stable system can not do without feedback, feedback is an important means to stabilize the system to improve the system, especially in electronic circuits. Feedback is the more difficult to understand the concept of electronic circuits, the difficulty lies in how to determine the polarity of feedback, that is, positive feedback or negative feedback; how to determine the source of the feedback signal, the feedback signal is from the output voltage, Or from the output current; how to control the input signal feedback signal, which is the input in series, or in parallel. The first of these three issues, especially the first one, is more important and it is decided