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在计算放大器的输入电阻、输出电阻时,一般是通过列回路电压方程的方法进行求解。有时候,这种方法不但繁琐,而且所得结果的物理意义不明显。但是,如果应用电阻“折合”的概念进行计算,上述问题就能得到解决。一、从折合的角度看待放大器的输入电阻、输出电阻电阻“折合”就是在保证电阻两端电压降不变的前提下,将电阻等效到新的电流回路
In calculating the amplifier’s input resistance, the output resistance, the general method is to solve the column voltage loop. Sometimes, this method is not only cumbersome, but the physical meaning of the results obtained is not obvious. However, the above problem can be solved by applying the concept of resistance “folding”. First, from the perspective of the equivalent of the amplifier input resistance, output resistance resistance “equivalent” is to ensure that the voltage drop across the resistor unchanged under the premise of the resistance equivalent to a new current loop