本帖最后由 jz0095 于 2015-10-16 15:58 编辑
在回答楼主的问题前，应该把可行的电流源等效电路搞明白，做到理论联系实际。 实际电流源输出电压不是无限的，有一个最大值，称为compliancevoltage (CV)。诺顿电流源等效电路模型只有工作在CV范围之内才是有效的。也就是说，对于恒定的输出电流I，最大负载Rmax的取值是固定的，Rmax=CV/I。为了保证在任何无源负载下电路都工作在正常状态，需要将Rmax并在电流源输出阻抗（高阻抗）上。这样，Rmax 就是电流源的组成部分，源阻抗≈Rmax，电流源的两个参数就是（I，Rmax）。 当接入LC并联谐振电路后，就可以保证在失谐和谐振下，电路工作状态都正常。
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关于compliance voltage的说明见下：
. The compliance voltage （CV）is the maximum voltage that the current source can supply to a load. Over a given load range, it is possible for some types of real current sources to exhibit nearly infinite internal resistance. However, when the current source reaches its compliance voltage, it abruptly stops being a current source. In circuit analysis, a current source having finite internal resistance is modeled by placing the value of that resistance across an ideal current source (the Norton equivalent circuit). However, this model is only useful when a current source is operating within its compliance voltage. （译红字部分） CV是电流源可以输出的最大电压。…. 在电路分析中，…（诺顿等效电路）。但是此模型只有在电流源工作在CV范围内才有效。
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